LMH6503 Wideband, Low Power, Linear Variable Gain ... · PDF fileLMH6503 SNOSA78E –...

33
LMH6503 www.ti.com SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013 LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier Check for Samples: LMH6503 1FEATURES DESCRIPTION The LMH™6503 is a wideband, DC coupled, 23V S = ±5V, T A = 25°C, R F = 1k,R G = 174,R L = differential input, voltage controlled gain stage 100,A V =A V(MAX) = 10, Typical Values Unless followed by a high-speed current feedback Op Amp Specified. which can directly drive a low impedance load. Gain -3dB BW 135MHz adjustment range is more than 70dB for up to 10MHz. Gain Control BW 100MHz Maximum gain is set by external components and the Adjustment Range (Typical Over Temp) 70dB gain can be reduced all the way to cut-off. Power consumption is 370mW with a speed of 135MHz . Gain Matching (Limit) ±0.7dB Output referred DC offset voltage is less than 350mV Slew Rate 1800V/μs over the entire gain control voltage range. Device-to- Supply Current (No Load) 37mA device Gain matching is within 0.7dB at maximum gain. Furthermore, gain at any V G is tested and the Linear Output Current ±75mA tolerance is ensured. The output current feedback Op Output Voltage (R L = 100) ±3.2V Amp allows high frequency large signals (Slew Rate Input Voltage Noise 6.6nV/Hz = 1800V/μs) and can also drive heavy load current Input Current Noise 2.4pA/Hz (75mA). Differential inputs allow common mode rejection in low level amplification or in applications THD (20MHz, R L = 100,V O = 2V PP ) 57dBc where signals are carried over relatively long wires. Replacement for CLC522 For single ended operation, the unused input can easily be tied to ground (or to a virtual half-supply in APPLICATIONS single supply application). Inverting or non-inverting gains could be obtained by choosing one input Variable Attenuator polarity or the other. AGC To further increase versatility when used in a single Voltage Controller Filter supply application, gain control range is set to be Multiplier from 1V to +1V relative to pin 11 potential (ground pin). In single supply operation, this ground pin is tied to a "virtual" half supply. Gain control pin has high input impedance to simplify its drive requirement. Gain control is linear in V/V throughout the gain adjustment range. Maximum gain can be set to be anywhere between 1V/V to 100V/V or higher. For linear in dB gain control applications, see LMH6502 datasheet. The LMH6503 is available in the SOIC-14 and TSSOP-14 package. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2LMH is a trademark of Texas Instruments. 3All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2003–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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Page 1: LMH6503 Wideband, Low Power, Linear Variable Gain ... · PDF fileLMH6503 SNOSA78E – OCTOBER 2003– REVISED APRIL 2013 LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

LMH6503 Wideband, Low Power, Linear Variable Gain AmplifierCheck for Samples: LMH6503

1FEATURES DESCRIPTIONThe LMH™6503 is a wideband, DC coupled,

23• VS = ±5V, TA = 25°C, RF = 1kΩ, RG = 174Ω, RL =differential input, voltage controlled gain stage100Ω, AV = AV(MAX) = 10, Typical Values Unlessfollowed by a high-speed current feedback Op AmpSpecified.which can directly drive a low impedance load. Gain

• -3dB BW 135MHz adjustment range is more than 70dB for up to 10MHz.• Gain Control BW 100MHz Maximum gain is set by external components and the• Adjustment Range (Typical Over Temp) 70dB gain can be reduced all the way to cut-off. Power

consumption is 370mW with a speed of 135MHz .• Gain Matching (Limit) ±0.7dBOutput referred DC offset voltage is less than 350mV• Slew Rate 1800V/µsover the entire gain control voltage range. Device-to-

• Supply Current (No Load) 37mA device Gain matching is within 0.7dB at maximumgain. Furthermore, gain at any VG is tested and the• Linear Output Current ±75mAtolerance is ensured. The output current feedback Op• Output Voltage (RL = 100Ω) ±3.2VAmp allows high frequency large signals (Slew Rate

• Input Voltage Noise 6.6nV/√Hz = 1800V/μs) and can also drive heavy load current• Input Current Noise 2.4pA/√Hz (75mA). Differential inputs allow common mode

rejection in low level amplification or in applications• THD (20MHz, RL = 100Ω, VO = 2VPP) −57dBcwhere signals are carried over relatively long wires.

• Replacement for CLC522 For single ended operation, the unused input caneasily be tied to ground (or to a virtual half-supply in

APPLICATIONS single supply application). Inverting or non-invertinggains could be obtained by choosing one input• Variable Attenuatorpolarity or the other.

• AGCTo further increase versatility when used in a single• Voltage Controller Filtersupply application, gain control range is set to be

• Multiplier from −1V to +1V relative to pin 11 potential (groundpin). In single supply operation, this ground pin is tiedto a "virtual" half supply. Gain control pin has highinput impedance to simplify its drive requirement.Gain control is linear in V/V throughout the gainadjustment range. Maximum gain can be set to beanywhere between 1V/V to 100V/V or higher. Forlinear in dB gain control applications, see LMH6502datasheet.

The LMH6503 is available in the SOIC-14 andTSSOP-14 package.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2LMH is a trademark of Texas Instruments.3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Copyright © 2003–2013, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.

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+VIN

+5V

VG

R150:

R250:

RG170:

RF1k:

RL100:

6

5

4

3

12

10

911

-VIN

LMH6503

114

8 7

2

VOUT

-5V

13

NC

-1.2 -0.8 -0.4 0 0.4 0.8

VG (V)

-80

-70

-60

-50

-40

-30

30

GA

IN (

dB)

1.2

-20

-10

0

10

20

0

1

2

3

4

5

11

6

7

8

9

10

GA

IN (

V/V

)

VIN_DIFF = ±0.1V

dB

V/V

-40°C

25°C

85°C

-40°C

25°C

85°C

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Figure 1. Gain vs. VG for Various Temperature

Typical Application

Figure 2. AVMAX = 10V/V

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates.

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LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Absolute Maximum Ratings (1) (2)

ESD Tolerance: (3) Human Body 2KV

Machine Model 200V

Input Current ±10mA

VIN Differential ±(V+ −V−)

Output Current 120mA (4)

Supply Voltages (V+ - V−) 12.6V

Voltage at Input/ Output pins V+ +0.8V,V− - 0.8V

Soldering Information: Infrared or Convection (20 sec) 235°C

Wave Soldering (10 sec) 260°C

Storage Temperature Range −65°C to +150°C

Junction Temperature +150°C

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions forwhich the device is intended to be functional, but specific performance is not ensured. For ensured specifications, see the ElectricalCharacteristics tables.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability andspecifications.

(3) Human body model: 1.5kΩ in series with 100pF. Machine model: 0Ω in series with 200pF.(4) The maximum output current (IOUT) is determined by device power dissipation limitations or value specified, whichever is lower.

Operating Ratings (1)

Supply Voltages (V+ - V−) 5V to 12V

Temperature Range −40°C to +85°C

Thermal Resistance: θJA θJC

14-Pin SOIC 138°C/W 45°C/W

14-Pin TSSOP 160°C/W 51°C/W

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions forwhich the device is intended to be functional, but specific performance is not ensured. For ensured specifications, see the ElectricalCharacteristics tables.

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+0.2VDC

+VIN

-VIN

RF IN

R250:

RG820:

R150:

C10.01PF

+5V

-5V

0VDC

RT50:

RP110k:

RF910:

ROUT50:

RL50:2

VG

+

-

LMH6503

PORT 1

PORT 2

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Electrical Characteristics (1)

Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF

= ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes.

Parameter Test Conditions Min (2) Typ (2) Max (2) Units

Frequency Domain Response

BW -3dB Bandwidth VOUT < 0.5PP 135MHz

VOUT < 0.5PP, AV(MAX) = 100 50

GF Gain Flatness VOUT < 0.5VPP, 40 MHz−1V < VG < 1V, ±0.2dB

Att Range Flat Band (Relative to Max Gain) ±0.2dB Flatness, f < 30MHZ 20MHzAttenuation Range (3)

±0.1dB, f < 30MHZ 6.6

BW Gain Control Bandwidth VG = 0V (4) 100 MHzControl

PL Linear Phase Deviation DC to 60MHz 1.6 deg

G Delay Group Delay DC to 130MHz 2.6 ns

CT (dB) Feed-through VG = −1.2V, 30MHz (Output −48 dBReferred)

GR Gain Adjustment Range f < 10MHz 79dB

f < 30MHz 68

Time Domain Response

tr , tf Rise and Fall Time 0.5V Step 2.2 ns

OS% Overshoot 0.5V Step 10 %

SR Slew Rate 4V Step (5) 1800 V/µs

ΔG Rate Gain Change Rate VIN = 0.3V, 10%−90% of final 4.6 dB/nsoutput

Distortion & Noise performance

HD2 2nd Harmonic Distortion 2VPP, 20MHz −60 dBc

HD3 3rdHarmonic Distortion 2VPP, 20MHz −61 dBc

THD Total Harmonic Distortion 2VPP, 20MHz −57 dBc

En tot Total Equivalent Input Noise 1MHz to 150MHz 6.6 nV/√Hz

In Input Noise Current 1MHz to 150MHz 2.4 pA/√Hz

DG Differential Gain f = 4.43MHz, RL = 150Ω, Neg. 0.15 %Sync

DP Differential Phase f = 4.43MHz, RL = 150Ω, Neg. 0.22 degSync

(1) Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in verylimited self-heating of the device such that TJ = TA. No ensured specification of parametric performance is indicated in the electricaltables under conditions of internal self-heating where TJ > TA.

(2) Typical values represent the most likely parametric norm. Bold numbers refer to over temperature limits.(3) Flat Band Attenuation (Relative To Max Gain) Range Definition: Specified as the attenuation range from maximum which allows gain

flatness specified (either ±0.2dB or ±0.1dB), relative to AVMAX gain. For example, for f<30MHz, here are the Flat Band Attenuationranges:±0.2dB: 10V/V down to 1V/V=20dB range±0.1dB: 10V/V down to 4.7V/V=6.5dB range

(4) Gain Control Frequency Response Schematic:

(5) Slew Rate is the average of the rising and falling rates.

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Electrical Characteristics(1) (continued)Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF

= ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes.

Parameter Test Conditions Min (2) Typ (2) Max (2) Units

DC & Miscellaneous Performance

GACCU Gain Accuracy (see Application VG =1.0V +0.25 +0.9/−0.4Information) 0V < VG < 1V ±0.3 +1.3/−1.5 dB

−0.7V < VG < 1V ±0.4 +4.4/−4.3

G Match Gain Matching (see Application VG = 1.0 – ±0.7Information) 0 < VG < 1V – +1.7/−1.1 dB

−0.7V < VG < 1V – +4.0/−4.7

K Gain Multiplier (see Application 1.58 1.72 1.87 V/VInformation) 1.58 1.91

VCM Input Voltage Range Pin 3 & 6 Common Mode, ±2.0 ±2.2 V|CMRR| > 50dB (6) ±1.80

VIN_ DIFF Differential Input Voltage Across pins 3 & 6 ±0.34 ±0.37 V±0.28

IRG MAX RG Current Pins 4 & 5 ±1.70 ±2.30 mA±1.60

IBIAS Bias Current Pins 3 & 6 (7) 11 1820

µAPins 3 & 6 (7), 3 10VS= ±2.5V 13

TCBIAS Bias Current Drift Pin 3 & 6 (8) 100 nA/°C

I OFF Offset Current Pin 3 & 6 0.01 2.0 µA2.5

TC IOFF Offset Current Drift See (8) 5 nA/°C

RIN Input Resistance Pin 3 & 6 750 kΩCIN Input Capacitance Pin 3 & 6 5 pF

IVG VG Bias Current Pin 2, VG = 1.4V (7) 45 µA

TC IVG VG Bias Drift Pin 2 (8) 20 nA/°C

R VG VG Input Resistance Pin 2 70 KΩC VG VG Input Capacitance Pin 2 1.3 pF

VOUT Output Voltage Range RL = 100Ω ±3.00 ±3.20±2.97

VRL Open ±3.95 ±4.05

±3.90

ROUT Output Impedance DC 0.1 ΩIOUT Output Current VOUT ±4V from Rails ±75 ±90 mA

±70

VO OFFSET Output Offset Voltage −1V < VG < 1V ±80 ±350 mV±380

+PSRR +Power Supply Rejection Ratio Input Referred, 1V change, −80 −58 dB(See (9)) VG = 1.4V −56

−PSRR −Power Supply Rejection Ratio Input Referred, 1V change, −67 −57 dB(See (9)) VG = 1.4V −51

CMRR Common Mode Rejection Ratio Input Referred, VG = 1V −67 dB(See (10)) −1.8V < VCM < 1.8V

(6) CMRR definition: [|ΔVOUT/ΔVCM|/AV] with 0.1V differential input voltage. ΔVOUT is the change in output voltage with offset shiftsubtracted out.

(7) Positive current correspondes to current flowing in the device.(8) Drift determined by dividing the change in parameter distribution at temperature extremes by the total temperature change.(9) +PSRR definition: [|ΔVOUT/ΔV+| /AV], -PSRR definition: [|ΔVOUT/ΔV−| /AV] with 0.1V differential input voltage. ΔVOUT is the change in

output voltage with offset shift subtracted out.(10) CMRR definition: [|ΔVOUT/ΔVCM|/AV] with 0.1V differential input voltage. ΔVOUT is the change in output voltage with offset shift

subtracted out.

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V+

VG

+VIN

+RG

-RG

-VIN

V-

1

2

3

4

5

6

7

V-

VREF

VOUT

GND

I-

NC

V+

8

9

10

11

12

13

14

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Electrical Characteristics(1) (continued)Unless otherwise specified, all limits ensured for TJ = 25°C, VS = ±5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF

= ±0.1V, RL = 100Ω, VG = +1V. Boldface limits apply at the temperature extremes.

Parameter Test Conditions Min (2) Typ (2) Max (2) Units

IS Supply Current RL = Open 37 5053

mARL = Open, VS = ±2.5V 12 20

23

Connection Diagram

Top View

Figure 3. 14-Pin SOIC AND TSSOP PackagesSee Package Numbers D0014A and PW0014A

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1k 100k 10M 1G

FREQUENCY (Hz)

GA

IN (

dB)

100M1M10k

3

-5

-3

0

2

1

-1

-2

-4

-6

-7

40

-120

-80

-20

20

0

-40

-60

-100

-160

-7

PH

AS

E (

°)

PHASE

GAIN

25°C

VS = ±2.5V

0.55V

-0.48V

0V

AVMAX = 10GAIN NORMALIZED TO LOW FREQUENCY

VALUE AT EACH VG

-0.48V

0V

f (25 MHz/DIV)

0

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

1

GA

IN (

dB)

-270

-225

-180

-135

-90

-45

45

90

135

180

PH

AS

E (

°)2

3

225

270

GAIN

PHASE

VOUT = 0.5VPP

SEE NOTE 12

100

10 2

100102

7501k2.4k

AVMAX RF(k:)

1

1k 100k 10M 1G

FREQUENCY (Hz)

-9

-6

-3

GA

IN (

dB)

100M1M10k

0

-1

-4

-5

-7

-2

-8

-350

150

-200

-50

100

50

-100

-150

-250

0

-300

PH

AS

E (

°)

GAIN

PHASE

AVMAX = 10, VG = VGMAX

GAIN/PHASE DATA

NORMALIZED TO LOW

FREQUENCY VALUE AT 25°C

-40°C

25°C

85°C

-40°C

25°C

85°C

1

1k 100k 10M 1G

FREQUENCY (Hz)

-9

-6

-3

GA

IN (

dB)

100M1M10k

0

-1

-4

-5

-7

-2

-8

-160

40

-100

-40

20

0

-60

-80

-120

-20

-140

PH

AS

E (

°)

GAIN

PHASE

AVMAX = 10GAIN NORMALIZED TO LOW

FREQUENCY VALUE AT

EACH VG

1.2V-0.4V

-1.0V

1.2V

-0.4V

-1.0V

1M 10M 100M 1G

FREQUENCY (Hz)

-20

-18

-15

-13

-10

-8

-5

-3

0

3

5

GA

IN (

dB)

RF = 920:, RG = 820:

RF = 2.4k:, RG = 2.1k:

VOUT = 0.5VPP

AVMAX = 2

100k 1M 10M 100M 1G

FREQUENCY (Hz)

-35

-30

-25

-20

-15

-10

-5

0

5

GA

IN (

dB)

-270

-225

-180

-135

-90

-45

0

45

90

PH

AS

E (

°)

VOUT = 5VPP

AVMAX = 2

RF = 2.4k:

RG = 2.15k:

GAIN

PHASE

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Typical Performance CharateristicsUnless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:

Small Signal Frequency Response (AV = 2) Large Signal Frequency Response (AV = 2)

Figure 4. Figure 5.

Frequency Response over Temperature (AV = 10) Frequency Response for Various VG (AVMAX = 10)

Figure 6. Figure 7.

Frequency Response for Various VG (AVMAX = 10) (±2.5V) Small Signal Frequency Response

Figure 8. Figure 9.

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2.5 3 3.5 4 4.5 5 5.5

±SUPPLY VOLTAGE (V)

0

10

20

30

40

50

60

I S (m

A)

6

-40°C

85°C

25°C

RL = OPEN

VG = VG_MAX

2.5 3 3.5 4 4.5 5 5.5

±SUPPLY VOLTAGE (V)

0

10

20

30

40

50

60

I S (m

A)

6

-40°C

85°C

25°C

RL = OPEN

VG = VG_MIN

100k 1M 10M 100M 1G

FREQUENCY (Hz)

-20

-15

-10

-5

0

5

S21

(dB

)

VG = 0V AVERAGE

PIN = 0dBm

AVMAX = 2V/VS21 (dB) + 20 PLOTTED

SEE NOTE 11-8

-7

-6

-5

-4

-3

-2

-1

0

1

GA

IN (

dB)

f (10 MHz/DIV)

-120

-100

-80

-60

-40

-20

0

20

40

60

PH

AS

E (

°)

GAIN

PHASE

1.1V

0.5V

0V

-0.5V

AVMAX = 100

PIN = -22dBm

SEE NOTE 12

0 50M 100M

-8

-7

-6

-5

-4

-3

-2

-1

0

1

GA

IN (

dB)

f (10 MHz/DIV)

-120

-100

-80

-60

-40

-20

0

20

40

60

PH

AS

E (

°)

GAIN

PHASE

1.1V

0.5V

0V

-0.5V

AVMAX = 100

PIN = -42dBm

SEE NOTE 12

0 50M 100Mf (25 MHz/DIV)

0

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

1

GA

IN (

dB)

-270

-225

-180

-135

-90

-45

45

90

135

180

PH

AS

E (

°)

2

3

225

270

GAIN

PHASE

VOUT = 5VPP

100102

7501k2.4k

AVMAX RF(k:)

SEE NOTE 12

100

10

2

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Frequency Response for Various VG (AVMAX = 100)

Large Signal Frequency Response (Small Signal)

Figure 10. Figure 11.

Frequency Response for Various VG (AVMAX = 100)(Large Signal) Gain Control Frequency Response

Figure 12. Figure 13.

IS vs. VS IS vs. VS

Figure 14. Figure 15.

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1k 100k 100M

FREQUENCY (Hz)

-120

-80

0

CM

RR

(dB

)

10M1M10k

-20

-60

-100

-40

VS = ±5V

AVMAX = 10

PIN = 0dBmMIDGAIN

MAXGAIN

SEE NOTE 9

1k 100k 100M

FREQUENCY (Hz)

-120

-80

0

CM

RR

(dB

)

10M1M10k

-20

-60

-100

-40

VS = ±2.5V

AVMAX = 10

PIN = 0dBmMIDGAIN

MAXGAIN

SEE NOTE 9

1k 100k 100M

FREQUENCY (Hz)

-90

-70

0

PS

RR

(dB

)

10M1M10k

-20

-30

-80

-10

-40

-50

-60

+PSRR

-PSRRVS = ±5V

VG = VGMAX

SEE NOTE 10

1k 100k 100M

FREQUENCY (Hz)

-90

-70

0

PS

RR

(dB

)

10M1M10k

-20

-30

-80

-10

-40

-50

-60

+PSRR

-PSRR

VS = ±2.5V

VG = VGMAX

SEE NOTE 10

2 2.5 3 3.5 4 4.5 5 5.5 6

±Supply Voltage (V)

0

2

4

6

8

10

12

AV

MA

X (

V/V

)

-40°C

25°C

85°C

-40°C

VG = VG_MAX

VIN_DIFF = 0.1V

2.5 3 3.5 4 4.5 5 5.5 6

0

2

4

6

8

10

12

14

16

18

I B (P

A)

±SUPPLY VOLTAGES (V)

-40°C

85°C

25°C

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Input Bias Current vs. VS AVMAX vs. VS

Figure 16. Figure 17.

PSRR ±5V PSRR ±2.5V

Figure 18. Figure 19.

CMRR ±5V CMRR ±2.5V

Figure 20. Figure 21.

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-3 -2 -1 0 1 2 3

VCM (V)

40

50

60

70

80

90

100

110

120

VO

_OF

FS

ET (

mV

)

-40°C

25°C

85°C

VS = ±5V

VG = VGMAX

-3 -2 -1 0 1 2 3-45

-40

-35

-30

-25

-20

-15

-10

-5

0

VO

_OF

FS

ET

(mV

)

VCM (V)

-40°C

25°C

85°C

VS = ±5V

VG = VGMAX

-3 -2 -1 0 1 2 3

VCM (V)

0

10

20

30

40

50

60

I S (m

A)

85°C

25°C -40°C

85°C

VS = ±5V

VG = VGMAX

-1.5 -1 -0.5 0 0.5 1 1.510

12

14

16

18

20

22

24

26

28

I S (

mA

)

VCM (V)

-40°C

25°C

85°C

VS = ±2.5V

VG = VGMAX

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1-2

0

2

4

6

8

10

12

AV

MA

X (

V/V

)

VCM (V)

VS = ±2.5V

VIN_DIFF = 0.1V

VG = VGMAX

-40°C

85°C

25°C

-3 -2 -1 0 1 2 3

VCM (V)

-4

-2

0

2

4

6

8

10

12

AV

MA

X (

V/V

) 25°C85°C -40°C

VS = ±5V

VIN_DIFF = 0.1V

VG = VGMAX

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:AVMAX vs. VCM AVMAX vs. VCM

Figure 22. Figure 23.

Supply Current vs. VCM Supply Current vs. VCM

Figure 24. Figure 25.

Output Offset Voltage vs.VCM (Typical Unit 1) Output Offset Voltage vs.VCM (Typical Unit 2)

Figure 26. Figure 27.

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10 100 1k 2k1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2

2.1

K (

V/V

)

RG (:)

RF = 477:

RF = 690:

RF = 1.3k:

RF = 6.18k:

f (5 MHz/DIV)

2.00

2.10

2.20

2.30

2.40

2.50

2.60

2.70

2.80

GR

OU

P D

ELA

Y (

ns)

VG = VGMAX

AVMAX = 10

0 2 4 8 10

AV (V/V)

100k

1M

10M

100M

GA

IN F

LAT

NE

SS

(H

z)(R

ELA

TIV

E T

O M

AX

GA

IN)

61 3 5 7 9

RF = 1k:

RG = 170:

PIN = -10dBm

VG VARIED

±0.1dB

±0.2dB0.30

0.40

GA

IN (

dB)

f (3 MHz/DIV)

-1.6

-1.2

-0.8

-0.4

0

0.4

0.8

1.2

1.6

2

2.4

LIN

EA

R P

HA

SE

DE

VIA

TIO

N (

°)

-0.60

-0.50

-0.40

-0.30

-0.20

-0.10

0.00

0.10

0.20

GAIN

PHASE

-1.0V

1.2V

-0.4V

GAIN DATA NORMALIZED TO LOW

FREQUENCY VALUE AT EACH VG

-1.0V-0.4V

1.2V

-3 -2 -1 0 1 2 3

VCM (V)

-170

-160

-150

-140

-130

-120

-110

-100

VO

_OF

FS

ET

(mV

)

-40°C85°C

25°C

VS = ±5V

VG = VGMAX

100k 1M 10M 100M

FREQUENCY (Hz)

-120

-100

-80

-60

-40

-20

0

20

40

60

GA

IN (

dB)

AVMAX = 2

AVMAX = 10AVMAX = 100

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Output Offset Voltage vs.VCM (Typical Unit 3) Feed through Isolation

Figure 28. Figure 29.

Gain Flatness and Linear Phase Deviation Gain Flatness Frequency vs. Gain (1)

Figure 30. Figure 31.

Group Delay vs. Frequency K Factor vs. RG

Figure 32. Figure 33.

(1) Flat Band Attenuation (Relative To Max Gain) Range Definition: Specified as the attenuation range from maximum which allows gainflatness specified (either ±0.2dB or ±0.1dB), relative to AVMAX gain. For example, for f<30MHz, here are the Flat Band Attenuationranges:±0.2dB: 10V/V down to 1V/V=20dB range±0.1dB: 10V/V down to 4.7V/V=6.5dB range

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-1.5 1 -0.5 0 0.5 1 1.5

-30

-25

-20

-15

-10

-5

0

5

10

15

VO

_OF

FS

ET

(mV

)

VG (V)

-40°C

25°C

85°C

-1.5 -1 -05 0 0.5 1 1.5

VG (V)

-160

-140

-120

-100

-80

-60

-40

-20

0

VO

_OF

FS

ET (

mV

)

-40°C

25°C85°C

-1.5 -1 -0.5 0 0.5 1 1.5

VG (V)

0

20

40

60

80

100

120

VO

_OF

FS

ET (

mV

)

-40°C

25°C

85°C

-1.2 -0.8 -0.4 0 0.4 0.8

VG (V)

-80

-70

-60

-50

-40

-30

30

GA

IN (

dB)

1.2

-20

-10

0

10

20

0

1

2

3

4

5

11

6

7

8

9

10

GA

IN (

V/V

)

VIN_DIFF = ±0.1V

dB

V/V

-40°C

25°C

85°C

-40°C

25°C

85°C

100 1k 10k 100k

RF (:)

1

10

100

1000

BW

(M

Hz)

RG = 27:

RG = 47:

RG = 1190:

RG = 466:

RG = 180:

RG = 100:

GA

IN (

V/V

)

-1.2 -0.8 -0.4 0 0.4 1.2

VG (V)

0

2

4

6

8

10

12

0.8

LIMIT LOW

LIMIT HIGH

TYPICAL

VIN_DIFF = ±0.1V

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Gain vs. VG Including Limits BW vs. RF for Various RG

Figure 34. Figure 35.

Output Offset Voltage vs. VGGain vs. VG (±5V) (Typical Unit 1)

Figure 36. Figure 37.

Output Offset Voltage vs. VG Output Offset Voltage vs. VG(Typical Unit 2) (Typical Unit 3)

Figure 38. Figure 39.

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100 1k 10k 100k 1M

FREQUENCY (Hz)

10

100

1000

10000

e no

(nV

/H

z)

MAX GAIN

MID GAIN

MIN GAIN

AVMAX = 2

RF = 910:

RG = 820:

100 1k 10k 100k 1M

FREQUENCY (Hz)

10

100

1000

10000

e no

(nV

/H

z)

MAX GAIN

MID GAIN

MIN GAIN

AVMAX = 10

RF = 1k:

RG = 180:

2.5 3 3.5 4 4.5 5 5.5 6 6.5

-200

0

VO

_OF

FS

ET (

mV

)

±VS (V)

-180

-160

-140

-120

-100

-80

-60

-40

-20

MAX

MIN

MID

-0.6 -0.2 0.2 0.6

0

1

2

3

4

5

6

7

8

9

10

GA

IN (

V/V

)

VG (V)

-0.4 0.40.0

VS = ±2.5V

RF = 980:

RG = 180:

2.5 3 3.5 4 4.5 5 5.5 6 6.5

-25

25

VO

_OF

FS

ET (

mV

)

±VS (V)

-20

-15

-10

-5

0

5

10

15

20

MAX

MID

MIN

2.5 3 3.5 4 4.5 5 5.5 6 6.5

±VS (V)

0

20

40

60

80

100

120

140

VO

_OF

FS

ET (

mV

)

MAX

MID

MIN

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Output Offset Voltage vs. ±VS for Various VG Output Offset Voltage vs. ±VS for Various VG

(Typical Unit 1) (Typical Unit 2)

Figure 40. Figure 41.

Output Offset Voltage vs. ±VS for Various VG(Typical Unit 3) Gain vs. VG (±2.5V)

Figure 42. Figure 43.

Noise vs. Frequency (AVMAX = 2) Noise vs. Frequency (AVMAX = 10)

Figure 44. Figure 45.

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-10 -5 0 5 10 15 20

POUT (dBm)

20

30

40

50

60

70

80

90

100

|HD

(dB

c)|

1MHz

10MHz

20MHz

AVMAX = 10

VG = VGMAX

-10 -5 0 5 10 15 2040

45

50

55

60

65

70

75

80

85

90

|HD

(dB

c)|

POUT (dBm)

1MHz

10MHz

20MHz

AVMAX = 10

VG = VGMAX

0 20 40 60 80 1000

0.5

1

1.5

2

2.5

3

3.5

4

4.5

VO

UT F

RO

M S

UP

PLY

(V

)

IOUT (mA)

SOURCE

SINK

VIN_DIFF = ±0.5V

-10 -5 0 5 10 15 20

POUT (dBm)

50

55

60

65

70

75

80

85

90

|HD

(dB

c)|

1MHz

10MHz

20MHz

AVMAX = 10

VG = VGMAX

0 20 40 60 80 100 120 140 16015

24

-1dB

CO

MP

RE

SS

ION

(dB

m)

FREQUENCY (MHz)

16

17

18

19

20

21

22

23

INPUT LIMITED, RF = 620:

OUTPUT LIMITED , RF = 1.5k:

VG = VGMAX

RG = 180:

10 1k 100k 10M

FREQUENCY (Hz)

10

100

10k

100k

1M10k100

1k

e n(O

UT

) (n

V/

Hz)

AVMAX = 100

RF = 2k:

RG = 24:

RL = 100:

MAX GAIN

MID GAIN

NO GAIN

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:Noise vs. Frequency (AVMAX = 100) −1dB Compression

Figure 46. Figure 47.

Output Voltage vs. Output Current HD2 vs. POUT

Figure 48. Figure 49.

HD3 vs. POUT THD vs. POUT

Figure 50. Figure 51.

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-1.5

-1.2

-0.9

-0.6

-0.3

0

0.3

0.6

0.9

1.2

1.5

VG

(V

)

t (10ns/DIV)

0

1

2

3

4

5

6

7

8

9

10G

AIN

(V

/V)

VG

VIN= 0.3V

AVMAX= 10

RL= 100:

GAIN

2.5VPP LARGE SIGNAL

0.5VPP SMALL SIGNAL

4 ns/DIV

SS REF

LS REF

VG = VG_MID

-1.4 -1.0 -0.6 -0.2 0.2 1.40

5

15

20

25

30

35

40

45

50

IVG

(P

A)

VG (V)

10

1.00.6

5VPP LARGE SIGNAL

0.5VPP SMALL SIGNAL

4 ns/DIV

SS REF

LS REF

-1 -0.6 -0.2 0.2 0.6 1

20

30

40

50

60

70

80

90

|HD

(dB

c)|

VG (V)

HD3, 0.25VPP

HD2, 0.25VPP

HD3, 2VPP

HD2, 2VPP

HD2, 1VPP

HD3, 1VPP20MHZ

-1 -0.6 -0.2 0.2 0.6 10

10

20

30

40

50

60

70

80

|TH

D (

dBc)

|

VG (V)

0.25VPP

1VPP

2VPP

f = 20MHz

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:HD2 & HD3 vs. VG THD vs. VG

Figure 52. Figure 53.

VG Bias Current vs. VG Step Response Plot

Figure 54. Figure 55.

Step Response Plot Gain vs. VG Step

Figure 56. Figure 57.

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0V

G (

1V/D

IV)

t (10ns/DIV)

0

VO

UT (

40m

V/D

IV)

VG

VOUT

AVMAX= 10

RL= 100:

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Typical Performance Charateristics (continued)Unless otherwise specified: VS = ±5V, 25°C, VG = VG_MAX, VCM = 0V, RF = 1kΩ, RG = 174Ω, both inputs terminated in 50Ω, RL

= 100Ω, Typical values, results referred to device output:VG Feedthrough

Figure 58.

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X1

X1

X

VG

-VIN

K

VG + 1

2

IRGRG

IRG

CFBOP AMP

+

-VINPUT RF

I-

VREF

VOUT

+VIN

AV = 1.72 RF

RG

AV = RF

RGx 1.72 x

VG + 1

2

IRG =VINPUT

RG

VOUT = IRG x K x VG + 1

2x RF FOR -1 < VG < +1

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

APPLICATION INFORMATION

THEORY OF OPERATION

The LMH6503 is a linear wideband variable-gain amplifier as illustrated in Figure 59. A voltage input signal maybe applied differentially between the two inputs (+VIN, −VIN), or single-endedly by grounding one of the twounused inputs. The LMH6503 input buffers convert the input voltage to a current (IRG) that is a function of thedifferential input voltage (VINPUT = (+VIN) - (−VIN)) and the value of the gain setting resistor (RG). This current (IRG)is then mirrored to a gain stage with a current gain of K (1.72 nominal). The voltage controlled two-quadrantmultiplier attenuates this current which is then converted to a voltage via the output amplifier. This outputamplifier is a current feedback op amp configured as a Transimpedance amplifier. Its Transimpedance gain is thefeedback resistor (RF). The input signal, output, and gain control are all voltages. The output voltage can easilybe calculated as shown in Equation 1:

(1)

Where K = 1.72 (Nominal)

since:

(2)

The gain of the LMH6503 is therefore a function of three external variables: RG, RF, and VG as expressed inEquation 3:

(3)

The gain control voltage (VG) has an ideal input range of −1V < VG < +1V. At VG = +1V, the gain of the LMH6503is at its maximum as expressed in Equation 4:

(4)

Notice also that Equation 4 holds for both differential and single-ended operation.

Figure 59. LMH6503 Functional Block Diagram

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1 10 100

AVMAX (V/V)

0.01

0.1

1

10

VIN

MA

X (

VP

)

2.7MHz5MHz10MHz

20MHz

50MHz

100MHz

150MHz

VOUT = 1VPP

VG = VGMAX

IRGMAX = 2.3mA

RF = 1K * RG * AVMAX

RG = IRGMAX

VINPUTMAX

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

CHOOSING RF AND RG

RG is calculated using Equation 5. VINPUTMAX is the maximum peak input voltage (Vpk) determined by theapplication. IRGMAX is the maximum allowable current through RG and is typically 2.3mA. Once AVMAX isdetermined from the minimum input and desired output voltages, RF is then determined using Equation 6. Thesevalues of RF and RG are the minimum possible values that meet the input voltage and maximum gain constraints.Scaling the resistor values will decrease bandwidth and improve stability.

(5)

(6)

Figure 60 illustrates the resulting LMH6503 bandwidths as a function of the maximum ( y axis) and minimum(related to x axis) input voltages when VOUT is held constant at 1VPP.

Figure 60. Bandwidth vs. VINMAX and AVMAX

ADJUSTING OFFSETS

Treating the offsets introduced by the input and output stages of the LMH6503 is accomplished with a two stepprocess. The offset voltage of the output stage is treated by first applying −1.1V on VG, which effectively isolatesthe input stage and multiplier core from the output stage. As illustrated in Figure 61, the trim pot located at R14on the LMH6503 Evaluation Board (LMH730033) should then be adjusted in order to null the offset voltage seenat the LMH6503's output (pin 10).

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LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Figure 61. Nulling the Output Offset Voltage

Once this is accomplished, the offset errors introduced by the input stage and multiplier core can then be treated.The second step requires the absence of an input signal and matched source impedances on the two input pinsin order to cancel the bias current errors. This done, then +1.1V should be applied to VG and the trim pot locatedat R10 adjusted in order to null the offset voltage seen at the LMH6503's output. If a more limited gain range isanticipated, the above adjustments should be made at these operating points. These steps will minimize theoutput offset voltage. However, since the offset term itself varies with the gain setting, the correction is notperfect and some residual output offset will remain.

GAIN ACCURACY

Defined as the ratio of measured gain (V/V), at a certain VG, to the best fit line drawn through the typical gain(V/V) distribution for −1V < VG < 1V (results expressed in dB) (See Figure 62). The best fit gain (AV) is given by:

AV (V/V) = 4.87VG + 4.61 (7)For: −1V ≤ VG ≤ + 1V, RF = 1kΩ, RG = 174Ω (8)

For a VG range, the value specified in the tables represents the worst case accuracy over the entire range. The"Typical" value would be the worst case ratio between the "Typical Gain" and the best fit line. The "Max" valuewould be the worst case between the max/min gain limit and the best fit line.

GAIN MATCHING

Defined as the limit on gain variation at a certain VG (expressed in dB) (See Figure 62). Specified as "Max" only(no "Typical"). For a VG range, the value specified represents the worst case matching over the entire range. The"Max" value would be the worst case ratio between the max/min gain limit and the typical gain.

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100 1k 10k 100k 1M

FREQUENCY (Hz)

10

100

1000

10000

e no

(nV

/H

z)

MAX GAIN

MID GAIN

MIN GAIN

AVMAX = 10

RF = 1k:

RG = 180:

VRMS = ein * 1.57 * (-3dB BANDWIDTH)

MIN GAIN LIMIT

TYPICAL GAIN

BEST FIT LINE

D

C

B

A

PARAMETER:GAIN ACCURACY (TYPICAL) = B/C (dB)GAIN ACCURACY (+ & - LIMIT) = D/C & A/C (dB)GAIN MATCHING (+ & - LIMIT) = D/B & A/B (dB)

GA

IN (

V/V

)

VG (V)

MAX GAIN LIMIT

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Figure 62. Gain Accuracy and Gain Matching Parameters Defined

NOISE

Figure 63 describes the LMH6503's output-referred spot noise density as a function of frequency with AVMAX =10V/V. The plot includes all the noise contributing terms. However, with both inputs terminated in 50Ω, the inputnoise contribution is minimal. At AVMAX = 10V/V, the LMH6503 has a typical flat-band input-referred spot noisedensity (ein) of 6.6nV/√Hz. For applications with −3dB BW extending well into the flat-band region, the input RMSvoltage noise can be determined from the following single-pole model:

(9)

Figure 63. Output Referred Voltage Noise vs. Frequency

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CIRCUIT LAYOUT CONSIDERATIONS

Good high-frequency operation requires all of the de-coupling capacitors shown in Figure 64 to be placed asclose as possible to the power supply pins in order to insure a proper high-frequency low-impedance bypass.Adequate ground plane and low inductive power returns are also required of the layout. Minimizing the parasiticcapacitances at pins 3, 4, 5, 6, 9, 10 and 12 will assure best high frequency performance. The parasiticinductance of component leads or traces to pins 4, 5 and 9 should also be kept to a minimum. Parasitic or loadcapacitance, CL, on the output (pin 10) degrades phase margin and can lead to frequency response peaking orcircuit oscillation. The LMH6503 is fully stable when driving a 100Ω load. With reduced load (e.g. 1kΩ) there is apossibility of instability at very high frequencies beyond 400MHz especially with a capacitive load. When theLMH6503 is connected to a light load as such, it is recommended to add a snubber network to the output (e.g.100Ω and 39pF in series tied between the LMH6503 output and ground). CL can also be isolated from the outputby placing a small resistor in series with the output (pin 10).

Figure 64. Required Power Supply Decoupling

Component parasitics also influence high frequency results. Therefore it is recommended to use metal filmresistors such as RN55D or leadless components such as surface mount devices. High profile sockets are notrecommended.

Texas Instruments suggests the following evaluation board as a guide for high frequency layout and as an aid indevice testing and characterization:

Device Package Evaluation Board Part Number

LMH6503MA SOIC-14 LMH730033

SINGLE SUPPLY OPERATION

It is possible to operate the LMH6503 with a single supply. To do so, tie pin 11 (GND) to a potential about midpoint between V+ and V−. Two examples are shown in Figure 65 & Figure 66.

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+

-

R1510:

RG160:

LMH6503VOUT

COUT0.1µF

ROUT50:

RF1k:

3

2

76

112

14

119

8

10

13

C10.1µF

R2510:

VS VS/2

VG

+

-

+VIN

-VIN

R1510:

RG180:

R32k:

LMH6503

R42k:

VOUT

COUT0.1µF

ROUT50:

RF1k:

3

2

76

112

14

119

8

10

13

RANGE: ±1V FROM PIN 11

VOLTAGE (FOR VS = 10V)

VG

C10.1µF

R2510:

VS

VS/2

LMH6503

SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com

Figure 65. AC Coupled Single Supply VGA

Figure 66. Transformer Coupled Single Supply VGA

OPERATING AT LOWER SUPPLY VOLTAGES

The LMH6503 is rated for operation down to 5V supplies (V+ - V−). There are some specifications shown foroperation at ±2.5V within the data sheet (i.e. Frequency Response, CMRR, PSRR, Gain vs. VG, etc.). Comparedto ±5V operation, at lower supplies:

a) VG range constricts. Referring to Figure 67, note that VG_MAX (VG voltage required to get maximum gain) is0.5V (VS = ±2.5V) compared to 1.0V for VS = ±5V. At the same time, gain cut-off (VG_MIN) would shift to−0.5V from - 1V with VS = ±5V.Table 1 shows the approximate expressions for various VG voltages as a function of V-:

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V- (V)

-6 -5.5 -5 -4.5 -4 -3.5 -30

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

VG

(V

)

19.5

19.6

19.7

19.8

19.9

20

20.1

20.2

20.3

20.4

20.5

MA

X G

AIN

(dB

)

VG MAX

MAX GAIN

VG LIMIT

V+ = 5V

RF = 1k:

RG = 170:

-4.5 -4 -3.5 -3 -2.5 -20

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

VG

(V

)

V- (V)

16.5

17

17.5

18

18.5

19

19.5

20

20.5

MA

X G

AIN

(dB

)

VG MAX

MAX GAIN

VG LIMIT

V+ = 2.5V

RF = 1k:

RG = 170:

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Table 1. VG Definition Based on V−

VG Definition Expression (V)

VG_MIN Gain Cut-off 0.2 x V−

VG_MID AVMAX/2 0

VG_MAX AVMAX −0.2 x V−

b) VG_LIMIT (maximum permissible voltage on VG) is reduced. This is due to limitations within the devicearising from transistor headroom. Beyond this limit, device performance will be affected (non-destructive).Referring to Figure 67, note that with V+ = 2.5V, and V− = −4V, VG_LIMIT is approaching VG_MAX and already"Max gain" is reduced by 1dB. This means that operating under these conditions has reduced themaximum permissible voltage on VG to a level below what is needed to get Max gain. If supply voltagesare asymmetrical, reference Figure 67 and Figure 68 plots to make sure the region of operation is notoverly restricted by the "pinching" of VG_LIMIT, and VG_MAX curves.

c) "Max_gain" reduces. There is an intrinsic reduction in max gain when the total supply voltage is reduced(see Figure 43). In addition, there is the more drastic mechanism described in "b" above and shown inFigure 67.

Similar plots for V+ = 5V operation are shown in Figure 68 for comparison and reference.

Figure 67. VG_MAX, VG_LIMIT, & Max-gain vs. V-

(V+ = 2.5V)

Figure 68. VG_MAX, VG_LIMIT, & Max-gain vs. V-

(V+ = 5V)

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Application Circuits

FOUR-QUADRANT MULTIPLIER

Applications requiring multiplication, squaring or other non-linear functions can be implemented with four-quadrant multipliers. The LMH6503 implements a four-quadrant multiplier as illustrated in Figure 69:

Figure 69. Four Quadrant Multiplier

FREQUENCY SHAPING

Frequency shaping and bandwidth extension of the LMH6503 can be accomplished using parallel networksconnected across the RG ports. The network shown in the Figure 70 schematic will effectively extend theLMH6503's bandwidth.

Figure 70. Frequency Shaping

2nd ORDER TUNABLE BANDPASS FILTER

The LMH6503 Variable-Gain Amplifier placed into a feedback loop provides signal processing function such as ina 2nd order tunable bandpass filter. The center frequency of the 2nd order bandpass shown in Figure 71 isadjusted through the use of the LMH6503's gain control voltage, VG. The integrators implemented with twosections of a LMH6682, provide the coefficients for the transfer function.

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VO 1n

s2 + s

=

1

CRB

+p

C2RY2

s1

CRB

p = 1.72RF

RY

, Q =

pRB

RY

,ZOp

CRY

VIN = -

LMH6503

www.ti.com SNOSA78E –OCTOBER 2003–REVISED APRIL 2013

Figure 71. Tunable Bandpass Filter

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REVISION HISTORY

Changes from Revision D (April 2013) to Revision E Page

• Changed layout of National Data Sheet to TI format .......................................................................................................... 25

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PACKAGE OPTION ADDENDUM

www.ti.com 1-Nov-2013

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status(1)

Package Type PackageDrawing

Pins PackageQty

Eco Plan(2)

Lead/Ball Finish(6)

MSL Peak Temp(3)

Op Temp (°C) Device Marking(4/5)

Samples

LMH6503MA NRND SOIC D 14 55 TBD Call TI Call TI -40 to 85 LMH6503MA

LMH6503MA/NOPB ACTIVE SOIC D 14 55 Green (RoHS& no Sb/Br)

CU SN Level-1-260C-UNLIM -40 to 85 LMH6503MA

LMH6503MAX/NOPB ACTIVE SOIC D 14 2500 Green (RoHS& no Sb/Br)

CU SN Level-1-260C-UNLIM -40 to 85 LMH6503MA

LMH6503MT NRND TSSOP PW 14 94 TBD Call TI Call TI -40 to 85 LMH6503MT

LMH6503MT/NOPB ACTIVE TSSOP PW 14 94 Green (RoHS& no Sb/Br)

CU SN Level-1-260C-UNLIM -40 to 85 LMH6503MT

LMH6503MTX/NOPB ACTIVE TSSOP PW 14 2500 Green (RoHS& no Sb/Br)

CU SN Level-1-260C-UNLIM -40 to 85 LMH6503MT

(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availabilityinformation and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement thatlead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used betweenthe die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weightin homogeneous material)

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device.

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PACKAGE OPTION ADDENDUM

www.ti.com 1-Nov-2013

Addendum-Page 2

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finishvalue exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on informationprovided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

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TAPE AND REEL INFORMATION

*All dimensions are nominal

Device PackageType

PackageDrawing

Pins SPQ ReelDiameter

(mm)

ReelWidth

W1 (mm)

A0(mm)

B0(mm)

K0(mm)

P1(mm)

W(mm)

Pin1Quadrant

LMH6503MAX/NOPB SOIC D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.0 Q1

LMH6503MTX/NOPB TSSOP PW 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 6-Nov-2015

Pack Materials-Page 1

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*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

LMH6503MAX/NOPB SOIC D 14 2500 367.0 367.0 35.0

LMH6503MTX/NOPB TSSOP PW 14 2500 367.0 367.0 35.0

PACKAGE MATERIALS INFORMATION

www.ti.com 6-Nov-2015

Pack Materials-Page 2

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IMPORTANT NOTICE

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