NJU7026/NJU7027/NJU7028
Ver.03 [1]
13μA/ch, Rail-to-Rail Output CMOS Operational Amplifier FEATURES (V+=5V, V-=0V, Ta=25°C, typ.) ●Supply Current (All Amplifiers) NJU7026 13µA NJU7027 26µA NJU7028 48µA ●Supply Voltage 1.8V to 5.5V ●Gain Bandwidth Product 160kHz ●Rail-to-Rail Output RL=100kΩ to V+/2 50mV from rail ●Ground Sense ●Common-Mode Input Voltage Range 0V to 4.1V ●Input Offset Voltage 4mV max. ●Input Offset Voltage Drift 1.5µV/°C ●Thin and Ultra Small Package ESON8-U1 2.0 x 2.0 x 0.4 mm ●RF noise Immunity ●Unity-Gain Stable ●Package NJU7026 SOT-23-5, SC-88A NJU7027 MSOP8 (TVSP8)*
*meet JEDEC MO-187-DA / thin type DFN8-U1(ESON8-U1) NJU7028 SSOP14
APPLICATIONS ●Battery-powered instruments ●Current sensor amplifiers ●Voltage/current monitoring ●Power line monitoring ●Photodiode amplifiers
DESCRIPTION The NJU7026/NJU7027/NJU7028 are single, dual
and quad rail-to-rail output single supply CMOS operational amplifiers featuring low supply current.
These amplifiers operates from single 1.8V to 5.5V supply or dual ±0.9V to ±2.75V supply and provide a 160kHz gain-bandwidth products while using only 13μA of supply current per channel, ideal for 2-cell battery systems and 1-cell li-ion battery systems.
NJU7026/NJU7027/NJU7028 have rail-to-rail outputs that typically swing to within 50mV of the rails with 100kΩ load and the input common mode voltage range includes negative supply rail and swing to within 0.9V of the positive rail. These characteristics make them suited for low-side current sense applications.
In addition to low power and rail-to-rail output, very low bias current make them to used for photodiode amplifiers, charge amplifiers, piezoelectric sensors and other applications with high source impedance.
NJU7026/NJU7027/NJU7028 are high RF-immunity to reduce malfunctions caused by RF noises from mobile phones and others.
The NJU7026 is available in 5-pin SC-88A and SOT-23 package. NJU7027 is available in 8-pin MSOP (TVSP): meet JEDEC MO-187-DA / thin type package and DFN which is thin and 2mm square small package. NJU7028 is available in 14-pin SSOP package. RELATED PRODUCTS
Features Single Dual Quad 0.23µA/ch, Rail-to-rail I/O NJU77001 NJU77002 NJU77004 (Ultralow power type) NJU77000 15nV/√Hz, Rail-to-rail Output NJU7056 NJU7057 NJU7058 (Low Noise type) 9V/µs, 5MHz, Rail-to-rail I/O NJU7046 NJU7047 NJU7048
(High slew rate type)
NJU7026/NJU7027/NJU7028
Ver.03 [2]
■ PIN CONFIGURATION / PRODUCT INFORMATION
Pin Function
Connect to exposed pad to V-
Package
SC-88A SOT-23-5 MSOP8(TVSP8) DFN8-U1(ESON8-U1) Product Name NJU7026F3 NJU7026F NJU7027RB1 NJU7027KU1
Pin Function
Package
SSOP14 Product Name NJU7028V
1
2
3
5
4
V+
V-
OUTPUT-INPUT
+INPUT
(Top View)
1
2
3
4
8
7
6
5
A +INPUT
A -INPUT
A OUTPUT
V-
V+
B OUTPUT
B -INPUT
B +INPUT
(Top View)
ExposedPad on
Underside
1
2
3
4
8
7
6
5
A +INPUT
A -INPUT
A OUTPUT
V-
V+
B OUTPUT
B -INPUT
B +INPUT
(Top View)
1
2
3
4
14
13
12
11
5
6
7
10
9
8
D +INPUT
D -INPUT
D OUTPUT
V-
C +INPUT
C -INPUT
C OUTPUT
A +INPUT
A -INPUT
A OUTPUT
V+
B +INPUT
B -INPUT
B OUTPUT
(Top View)
NJU7026/NJU7027/NJU7028
Ver.03 [3]
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted.) PARAMETER SYMBOL RATING UNIT
Supply Voltage V+ - V- 7 V
Input Voltage VIN V- - 0.3 to V+ + 0.3 V Differential Input Voltage (1) VID ±7 (2) V Input Current (3) IIN 10 mA Power Dissipation (4)
PD
(2-layer / 4-layer)(5)
mW
SOT-23-5 480 / 650 SC-88A 360 / 490 MSOP8(TVSP8) 510 / 680 SSOP14 500 / 620 DFN8-U1(ESON8-U1) 450(6) / 1200(6) Operating Temperature Range Topr -40 to +125 °C
Storage Temperature Range Tstg -55 to +150 °C (1) Differential voltage is the voltage difference between +INPUT and -INPUT. (2) For supply voltage less than +7V, the absolute maximum rating is equal to the supply voltage. (3) Input voltages outside the supply voltage will be clamped by ESD protection diodes. If the input voltage exceeds the supply
voltage, the input current must be limited 10 mA or less by using a restriction resistance. (4) Power dissipation is the power that can be consumed by the IC at Ta=25°C, and is the typical measured value based on
JEDEC condition. When using the IC over Ta=25°C subtract the value [mW/°C]=PD/(Tstg(MAX)-25) per temperature. (5) 2-layer: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layers, FR-4) mounting
4-layer: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 4layers, FR-4) mounting (6) 2-layer: EIA/JEDEC STANDARD Test board (101.5x114.5x1.6mm, 2layers, FR-4) mounting
4-layer: EIA/JEDEC STANDARD Test board (101.5x114.5x1.6mm, 4layers, FR-4) mounting ■ RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER CONDITION MIN. TYP. MAX. UNIT
Supply Voltage 1.8 - 5.5 V
0
100
200
300
400
500
600
700
0 25 50 75 100 125 150
Pow
er D
issi
patio
nP D
[mW
]
Ambient Temperature [ºC]
Power Dissipation vs. Temperature2-Layer
SC-88A
DFN8-U1(ESON8-U1)
MSOP8(TVSP8)
SSOP14
SOT-23-5
0100200300400500600700800900
1000110012001300
0 25 50 75 100 125 150
Pow
er D
issi
patio
nP D
[mW
]
Ambient Temperature [ºC]
Power Dissipation vs. Temperature4-Layer
SC-88A
DFN8-U1(ESON8-U1)
MSOP8(TVSP8)
SSOP14
SOT-23-5
NJU7026/NJU7027/NJU7028
Ver.03 [4]
■ ELECTRICAL CHARACTERISTICS (V+=5V, V-=0V, Ta=25°C, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
DC CHARACTERISTICS Supply Current (All Amplifiers)
ISUPPLY
No Signal NJU7026 - 13 20 μA NJU7027 - 26 40 μA NJU7028 - 48 72 μA Input Offset Voltage VIO VCOM= 0V, RS=50Ω - 0.9 4 mV Input Offset Voltage Drift
ΔVIO/ΔT Ta = -40°C to 125°C
NJU7026/NJU7027 - 1.5 - µV/°C NJU7028 - 2 - µV/°C Input Bias Current IB - 1 - pA Input Offset Current IIO - 1 - pA Open-Loop Voltage Gain AV RL=100kΩ to 2.5V, Vout=0.5V to 4.5V 70 90 - dB Common-Mode Rejection Ratio CMR VICM=0V to 4.1V 65 80 - dB Supply Voltage Rejection Ratio SVR V+=1.8V to 5.5V 70 90 - dB Common-Mode Input Voltage Range VICM CMR≥65dB 0 - 4.1 V
High-level Output Voltage VOH RL=100kΩ to 2.5V 4.9 4.95 - V RL=100kΩ to 0V 4.9 4.95 - V ISOURCE=1mA 4.8 4.85 - V
Low-level Output Voltage VOL RL=100kΩ to 2.5V - 0.05 0.1 V RL=100kΩ to 0V - 0.02 0.05 V ISINK=1mA - 0.15 0.2 V
AC CHARACTERISTICS
Slew Rate(7) SR GV=0dB, RL=100kΩ to 2.5V, CL=20pF, VIN=3VPP - 0.05 - V/µs
Gain Bandwidth Product GBW RL=100kΩ to 2.5V, CL=20pF, f=10kHz - 160 - kHz
Full Power Bandwidth FPBW GV=6dB, RF=RG=50kΩ, CL=20pF, VIN=2.5VPP, Vout≥4.8VPP - 5 - kHz
Phase Margin ΦM RL=100kΩ to 2.5V, CL=20pF - 80 - deg Gain Margin GM RL=100kΩ to 2.5V, CL=20pF - 15 - dB Equivalent Input Noise Voltage VNI f=1kHz - 50 - nV/√Hz
Total Harmonic Distortion + Noise THD+N GV=6dB, RF=RG=50kΩ, CL=20pF, VO=4VPP, f=100Hz - 0.01 - %
Channel Separation CS f=1kHz, NJU7027/NJU7028 - 120 - dB (7) Slew rate is defined by the lower value of the rise or fall.
NJU7026/NJU7027/NJU7028
Ver.03 [5]
■ ELECTRICAL CHARACTERISTICS (V+=3V, V-=0V, Ta=25°C, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
DC CHARACTERISTICS Supply Current (All Amplifiers)
ISUPPLY
No Signal NJU7026 - 12 19 μA NJU7027 - 24 36 μA NJU7028 - 45 68 μA Input Offset Voltage VIO VCOM= 0V, RS=50Ω - 0.9 4 mV Input Offset Voltage Drift
ΔVIO/ΔT Ta = -40°C to 125°C
NJU7026/NJU7027 - 1.5 - µV/°C NJU7028 - 2 - µV/°C Input Bias Current IB - 1 - pA Input Offset Current IIO - 1 - pA Open-Loop Voltage Gain AV RL=100kΩ to 1.5V, Vout=0.5V to 2.5V 70 90 - dB Common-Mode Rejection Ratio CMR VICM=0V to 2.1V 65 80 - dB Supply Voltage Rejection Ratio SVR V+=1.8V to 5.5V 70 90 - dB Common-Mode Input Voltage Range VICM CMR≥65dB 0 - 2.1 V
High-level Output Voltage VOH RL=100kΩ to 1.5V 2.9 2.95 - V RL=100kΩ to 0V 2.9 2.95 - V ISOURCE=1mA 2.8 2.85 - V
Low-level Output Voltage VOL RL=100kΩ to 1.5V - 0.05 0.1 V RL=100kΩ to 0V - 0.02 0.05 V ISINK=1mA - 0.15 0.2 V
AC CHARACTERISTICS
Slew Rate(7) SR GV=0dB, RL=100kΩ to 1.5V, CL=20pF, VIN=1VPP - 0.05 - V/µs
Gain Bandwidth Product GBW RL=100kΩ to 1.5V, CL=20pF, f=10kHz - 150 - kHz
Full Power Bandwidth FPBW GV=6dB, RF=RG=50kΩ, CL=20pF, VIN=1.5VPP, Vout≥2.8VPP - 8 - kHz
Phase Margin ΦM RL=100kΩ to 1.5V, CL=20pF - 80 - deg Gain Margin GM RL=100kΩ to 1.5V, CL=20pF - 15 - dB Equivalent Input Noise Voltage VNI f=1kHz - 50 - nV/√Hz
Total Harmonic Distortion + Noise THD+N GV=6dB, RF=RG=50kΩ, CL=20pF, VO=2VPP, f=100Hz - 0.01 - %
Channel Separation CS f=1kHz, NJU7027/NJU7028 - 115 - dB (7) Slew rate is defined by the lower value of the rise or fall.
NJU7026/NJU7027/NJU7028
Ver.03 [6]
■ ELECTRICAL CHARACTERISTICS (V+=1.8V, V-=0V, Ta=25°C, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
DC CHARACTERISTICS Supply Current (All Amplifiers)
ISUPPLY
No Signal NJU7026 - 12 18 μA NJU7027 - 22 34 μA NJU7028 - 43 65 μA Input Offset Voltage VIO VCOM= 0V, RS=50Ω - 0.9 4 mV Input Offset Voltage Drift
ΔVIO/ΔT Ta = -40°C to 125°C
NJU7026/NJU7027 - 1.5 - µV/°C NJU7028 - 2 - µV/°C Input Bias Current IB - 1 - pA Input Offset Current IIO - 1 - pA Open-Loop Voltage Gain AV RL=100kΩ to 0.9V, Vout=0.5V to 1.3V 70 90 - dB Common-Mode Rejection Ratio CMR VICM=0V to 0.9V 65 80 - dB Supply Voltage Rejection Ratio SVR V+=1.8V to 5.5V 70 90 - dB Common-Mode Input Voltage Range VICM CMR≥65dB 0 - 0.9 V
High-level Output Voltage VOH RL=100kΩ to 0.9V 1.7 1.75 - V RL=100kΩ to 0V 1.7 1.75 - V ISOURCE=0.5mA 1.5 1.55 - V
Low-level Output Voltage VOL RL=100kΩ to 0.9V - 0.05 0.1 V RL=100kΩ to 0V - 0.02 0.05 V ISINK=0.5mA - 0.25 0.3 V
AC CHARACTERISTICS
Slew Rate(7) SR GV=0dB, RL=100kΩ to 0V, CL=20pF, VIN=0.5VPP - 0.05 - V/µs
Gain Bandwidth Product GBW RL=100kΩ to 0.9V, CL=20pF, f=10kHz - 140 - kHz
Full Power Bandwidth FPBW GV=6dB, RF=RG=50kΩ, CL=20pF, VIN=0.9VPP, Vout≥1.6VPP - 14 - kHz
Phase Margin ΦM RL=100kΩ to 0.9V, CL=20pF - 80 - deg Gain Margin GM RL=100kΩ to 0.9V, CL=20pF - 15 - dB Equivalent Input Noise Voltage VNI f=1kHz - 50 - nV/√Hz
Total Harmonic Distortion + Noise THD+N GV=6dB, RF=RG=50kΩ, CL=20pF, VO=1VPP, f=100Hz - 0.01 - %
Channel Separation CS f=1kHz, NJU7027/NJU7028 - 110 - dB (7) Slew rate is defined by the lower value of the rise or fall.
NJU7026/NJU7027/NJU7028
Ver.03 [7]
■ TYPICAL CHARACTERISTICS
0
2
4
6
8
10
12
14
16
18
0 1 2 3 4 5 6 7
Supp
ly C
urre
nt p
er A
mpl
ifier
[μA]
Supply Voltage V+ [V]
Supply Current per Amplifiervs. Supply Voltage
GV=0dB
Ta=-40ºC
Ta=125ºC Ta=25ºC
0
2
4
6
8
10
12
14
16
18
-50 -25 0 25 50 75 100 125 150
Supp
ly C
urre
nt p
er A
mpl
ifier
[μA]
Ambient Temperature [ºC]
Supply Current per Amplifiervs. Temperature
GV=0dB
V+=3V
V+=5V
V+=1.8V
-1
0
1
2
3
0 1 2 3 4 5 6
Inpu
t Offs
et V
olta
ge[m
V]
Supply Voltage V+ [V]
Input Offset Voltage vs. Supply VoltageVCOM=V+/2
Ta=-40ºCTa=25ºC
Ta=85ºC
-1
0
1
2
3
-1 0 1 2 3 4 5
Inpu
t Offs
et V
olta
ge[m
V]
Common-Mode Input Voltage [V]
Input Offset Voltagevs. Common-Mode Input Voltage
V+=5V
Ta=-40ºC
Ta=25ºC Ta=125ºC
-1
0
1
2
3
-1 0 1 2 3
Inpu
t Offs
et V
olta
ge[m
V]
Common-Mode Input Voltage [V]
Input Offset Voltagevs. Common-Mode Input Voltage
V+=3V
Ta=-40ºC
Ta=25ºC Ta=125ºC
-1
0
1
2
3
-0.6 -0.3 0 0.3 0.6 0.9 1.2 1.5 1.8
Inpu
t Offs
et V
olta
ge[m
V]
Common-Mode Input Voltage [V]
Input Offset Voltagevs. Common-Mode Input Voltage
V+=1.8V
Ta=-40ºC
Ta=25ºC Ta=125ºC
NJU7026/NJU7027/NJU7028
Ver.03 [8]
■ TYPICAL CHARACTERISTICS
0%
5%
10%
15%
20%
25%
30%
-4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0
Perc
ent o
f Am
plifi
ers
Input Offset Voltage [mV]
Input Offset Voltage Distribution V+=5V, VCOM=0V, Ta=25ºC, n=300
0%
5%
10%
15%
20%
25%
30%
-9.0 -6.0 -3.0 0.0 3.0 6.0 9.0
Perc
ent o
f Am
plifi
ers
Input Offset Voltage Drift [μV/ºC]
Input Offset Voltage Drift Distribution V+=5V, VCOM=0V, n=300
-4
-3
-2
-1
0
1
2
3
4
-50 -25 0 25 50 75 100 125 150
Inpu
t Offs
et V
olta
ge[m
V]
Ambient Temperature [ºC]
Input Offset Voltage vs. TemperatureV+=5V, VCOM=2.5V, n=100
40
60
80
100
120
-50 -25 0 25 50 75 100 125 150
Ope
n-Lo
op V
olta
ge G
ain
[dB
]
Ambient Temperature [ºC]
Open-Loop Voltage Gain vs. TemperatureVO=0.5V to V+-0.5V, RL=100kΩ to V+/2
V+=5V
V+=3VV+=1.8V
40
60
80
100
120
-50 -25 0 25 50 75 100 125 150
Com
mon
-Mod
e an
d Su
pply
Vol
tage
R
ejec
tion
Rat
io[d
B]
Ambient Temperature [ºC]
Common-Mode and Supply Voltage Rejection Ratio vs. Temperature
CMR (V+=5V)
CMR (V+=3V)CMR (V+=1.8V)
SVR
100f
1p
10p
100p
1n
10n
25 50 75 100 125 150
Inpu
t Bia
s C
urre
nt[A
]
Ambient Temperature [ºC]
Input Bias Currentvs. TemperatureVCOM=V+/2
V+=1.8V
V+=5V
NJU7026/NJU7027/NJU7028
Ver.03 [9]
■ TYPICAL CHARACTERISTICS
0.0
0.3
0.6
0.9
1.2
1.5
1.8
0.01 0.1 1 10
Max
imum
Out
put V
olta
ge[V
]
Output Current [mA]
Maximum Output Voltage vs. Output CurrentV+=1.8V, VCOM=0.9V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL
0.000.050.100.15
0.0
0.5
1.0
1.5
2.0
2.5
3.0
10 100 1k 10k 100k
Low
-leve
l Out
put V
olta
geV O
L[m
V]
Hig
h-le
vel O
utpu
t Vol
tage
V OH
[V]
Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+=3V, GV=OPEN, RL connected to 0V
VOH
VOL
Ta=25ºC
Ta=-40ºC
Ta=125ºC
Ta=-40ºC
0.00.10.20.3
0.0
0.3
0.6
0.9
1.2
1.5
1.8
10 100 1k 10k 100k
Low
-leve
l Out
put V
olta
geV O
L[m
V]
Hig
h-le
vel O
utpu
t Vol
tage
V OH
[V]
Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+=1.8V, GV=OPEN, RL connected to 0V
VOH
VOL
Ta=25ºC
Ta=-40ºC
Ta=125ºC
Ta=-40ºC
0.00
0.05
0.10
0.15
0.0
1.0
2.0
3.0
4.0
5.0
10 100 1k 10k 100k
Low
-leve
l Out
put V
olta
geV O
L[m
V]
Hig
h-le
vel O
utpu
t Vol
tage
V OH
[V]
Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+=5V, GV=OPEN, RL connected to 0V
VOH
VOL
Ta=25ºC
Ta=-40ºC
Ta=125ºC
Ta=-40ºC
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.1 1 10 100
Max
imum
Out
put V
olta
ge[V
]
Output Current [mA]
Maximum Output Voltage vs. Output CurrentV+=3V, VCOM=1.5V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL0.0
1.0
2.0
3.0
4.0
5.0
0.1 1 10 100
Max
imum
Out
put V
olta
ge[V
]
Output Current [mA]
Maximum Output Voltage vs. Output CurrentV+=5V, VCOM=2.5V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL
NJU7026/NJU7027/NJU7028
Ver.03 [10]
■ TYPICAL CHARACTERISTICS
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
10 100 1k 10k
Max
imum
Out
put V
olta
ge[V
]
Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+/V-=±2.5V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL-1.5
-1.0
-0.5
0
0.5
1.0
1.5
10 100 1k 10k
Max
imum
Out
put V
olta
ge[V
]Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+/V-=±1.5V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL
-0.9
-0.7
-0.5
-0.3
-0.1
0.1
0.3
0.5
0.7
0.9
10 100 1k 10k 100k
Max
imum
Out
put V
olta
ge[V
]
Load Resistance [Ω]
Maximum Output Voltagevs. Load Resistance
V+/V-=±0.9V
Ta=125ºC
Ta=-40ºC
Ta=25ºC
Ta=125ºC
Ta=-40ºC
Ta=25ºC
VOH
VOL-180
-120
-60
0
-60
-40
-20
0
20
40
60
100 1k 10k 100k 1M
Phas
e[d
eg]
Volta
ge G
ain
[dB
]
Frequency [Hz]
40dB Voltage Gain/Phase vs. FrequencyV+=5V, GV=40dB, RL=100kΩ, Ta=25ºC
CL=20pF
CL=100pF
CL=150pF
CL=20pF
CL=100pF
CL=150pF
Gain
Phase
-180
-120
-60
0
-60
-40
-20
0
20
40
60
100 1k 10k 100k 1M
Phas
e[d
eg]
Volta
ge G
ain
[dB
]
Frequency [Hz]
40dB Voltage Gain/Phase vs. FrequencyGV=40dB, RL=100kΩ, CL=20pF, Ta=25ºC
V+=5V
V+=5V
V+=3V
V+=1.8V
V+=3V
V+=1.8V
Gain
Phase
1V/d
iv
50μs/div
Pulse ResponseV+=5V, GV=0dB, RL=100kΩ, Ta=25ºC
CL=20pF
CL=120pF
INPUT
OUTPUT
NJU7026/NJU7027/NJU7028
Ver.03 [11]
■ TYPICAL CHARACTERISTICS
0.0001
0.001
0.01
0.1
1
0.01 0.1 1 10
Tota
l Har
mon
ic D
isto
rtio
n +
Noi
se[%
]
Output Voltage [Vpp]
THD+N vs. Output VoltageV+=5V, GV=6dB, RF=RG=50kΩ, CL=20pF
BW=10Hz-500kHz, Ta=25ºC
f=20Hz
f=1kHz
f=100Hz
0
25
50
75
100
125
150
175
200
1 10 100 1k 10k
Equi
vale
nt In
put N
oise
Vol
tage
[nV/
√Hz]
Frequency [Hz]
Voltage Noise Density vs. FrequencyV+=5V, Ta=25ºC
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
10 100 1k 10k 100k
Cha
nnel
Sep
arat
ion
[dB
]
Frequency [Hz]
Channel Separation vs. FrequencyTa=25ºC
V+=1.8V
V+=3V
V+=5V
NJU7026/NJU7027/NJU7028
Ver.03 [12]
■ APPLICATION NOTE Single and Dual Supply Voltage Operation The NJU7026/NJU7027/NJU7028 works with both single supply and dual supply when the voltage supplied is between V+ and V−. These amplifiers operate from single 1.8 to 5.5V supply and dual ±0.9V to ±2.75V supply. Common-Mode Input Voltage Range When the supply voltage does not meet the condition of electrical characteristics, the range of common-mode input voltage is as follows: VICM (typ.) = V− to V+-0.9 (Ta = 25°C) Difference of VICM when Temperature change, refer to typical characteristic graph. During designing, consider variations in characteristics for use with allowance. Maximum Output Voltage Range When the supply voltage does not meet the condition of electrical characteristics, the range of the typ. value of the maximum output voltage is as follows: VOM (typ.) = V-+50mV to V+-50mV (RL=100kΩ to V+/2, Ta=25°C) During designing, consider variations in characteristics and temperature characteristics for use with allowance. In addition, also note that the output voltage range becomes narrow as shown in typical characteristics graph when an output current increases. Input Voltage Exceeding the Supply Voltage Inputs of the NJU7026/NJU7027/NJU7028 are protected by ESD diodes (shown in Figure1) that will conduct if the input voltages exceed the power supplies by more than approximately 300mV. Momentary voltages greater than 300mV beyond the power supply, inputs can be tolerated if the current is limited to 10mA. Figure2 is easily accomplished with an input resistor. If the input voltage exceeds the supply voltage, the input current must be limited 10mA or less by using a restriction resistance (RLIMIT) as shown in figure2.
Capacitive load The NJU7026/NJU7027/NJU7028 can use at unity gain follower, but the unity gain follower is the most sensitive configuration to capacitive loading. The combination of capacitive load placed directly on the output of an amplifier along with the output impedance of the amplifier creates a phase lag which in turn reduces the phase margin of the amplifier. If phase margin is significantly reduced, the response will cause overshoot and ringing in the step response. The NJU7026/NJU7027/NJU7028 is unity gain stable for capacitive loads of 220pF. To drive heavier capacitive loads, an isolation resistor, RISO as shown Figure3, should be used. RISO improves the feedback loop’s phase margin by making the output load resistive at higher frequencies. The larger the value of RISO, the more stable the output voltage will be. However, larger values of RISO result in reduced output swing, reduced output current drive and reduced frequency bandwidth.
V+
V-
VinVout
RISO
CL
Figure3. Isolating capacitive load
V+
V-
Current Limit10mA
RLIMIT
VinVout
Figure2. Input Current Protection for Voltages exceeding the Supply Voltage.
V+
OUTPUT+INPUT
-INPUT
V-
Figure1. Simplified Schematic
NJU7026/NJU7027/NJU7028
Ver.03 [13]
■ PACKAGE DIMENSIONS
SOT-23-5 Package
1.9±0.2
0.95±0.1
0.1-0.03
1.6
-0.1
+0.2
2.8±
0.2
0.6MAX
0.4±0.1
1 2 3
45
+0.1
0.1M
AX
1.1±
0.1
2.9±0.2
0.1
0°~15°
0.2M
IN0.
6
Unit: mm
Unit: mm
SC-88A Package
(0.2
45)
45
1 2 3
0-10°
1.25
±0.1
2.1±
0.2
2.0±0.2
0.23-0.05+0.1
0.13+0.1-0.03
0.65±0.07
1.3±0.2
0.42
5±0.
20.
425±
0.2
0.9±
0.1
0.05
±0.0
50.
2-0.
1+0
.2
0.95
-0.1
5+0
.05
NJU7026/NJU7027/NJU7028
Ver.03 [14]
■ PACKAGE DIMENSIONS
MSOP8 (TVSP8) Package meet JEDEC MO-187-DA / thin
type Package
0.475±0.1
2.8±
0.1
0.127-0.03
41
0~10°
0.55
±0.1
2.9±0.1
4.0±
0.2
0.65
58
1.0M
AX
0.1±
0.05
0.08
0.2±0.05 0.05 M
+0.05
DFN8-U1(ESON8-U1) Package
*Connect the exposed pad to V-.
Exposed pad
Unit: mm
Unit: mm
NJU7026/NJU7027/NJU7028
Ver.03 [15]
■ PACKAGE DIMENSIONS
1 7
8
6.4±
0.3
4.4±
0.2
0.22±0.1
0.1
1.15
±0.1
0.1±
0.1
0.65
0.5±
0.2
0.15-0.05+0.1
0 ~ 10º
0.67MAX
5.0 -0.1+0.3
14
0.1 M
Unit: mm
[CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
SSOP14 Package
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