Precision Amplifiers (VOS < 1 mV, Bandwidth < 50 MHz)
Low Offset Voltage (VOS ≤ 1 mV)
AD8657: Precision, Micropower, 18 V CMOS RRIO Op Amplifier
The AD8657 is a dual, precision, micropower, rail-to-rail input/output (RRIO) amplifier optimized for low power and wide operating supply voltage range
applications. The device operates from 2.7 V up to 18 V with a typical quiescent supply current of 18 mA and achieves low offset voltage thanks to Analog
Devices’ patented DigiTrim trimming technique. The AD8657 also has high immunity to electromagnetic interference. The combination of low supply cur-
rent, low offset voltage, very low input bias current, wide supply range, and rail-to-rail input and output makes the AD8657 ideal for current monitoring and
current loops in process and motor control applications. In addition, the precision specifications make this device well suited for dc gain and buffering of
sensor front ends or high impedance input sources in wireless or remote sensors or transmitters
Features
ADR125
VREF
•ꢀMicropower at high voltage (18 V): 18 mA typical
•ꢀLow offset voltage: 350 mV maximum
•ꢀSingle-supply operation: 2.7 V to 18 V
•ꢀDual-supply operation: ±1.35 V to ±9 V
•ꢀLow input bias current: 20 pA
V
V
OUT
GND
IN
R
1MΩ
NULL
C2
C3
C4
C5
10ꢀF 0.1ꢀF
0.1ꢀF 10ꢀF
1%
R
SPAN
200kΩ
1/2
AD8657
1%
V
Q1
IN
0VTO5V
•ꢀGain bandwidth: 200 kHz
V
DD
18V
•ꢀUnity-gain stable
•ꢀExcellent electromagnetic interference immunity
R4
3.3kΩ
R1
68kΩ
1%
D1
4mA
TO
20mA
R3
1.2kΩ
C1
390ꢁF
R
L
100Ω
R2
2kΩ
1%
Applications
R
SENSE
100Ω
•ꢀPortable operating systems
•ꢀCurrent monitors
•ꢀ4 mA to 20 mA loop drivers
•ꢀBuffer/level shifting
1%
NOTES
1.R1+R2=R´.
4 mA to 20 mA current loop transmitter.
•ꢀMultipole filters
•ꢀRemote/wireless sensors
•ꢀLow power transimpedance amplifiers
Low Offset Voltage (VOS ≤ 1mV) Amplifiers
Supply
Voltage
(Min/Max)
BW @
CL Min Rate
(MHz) (V/ms) (dB)
Slew CMRR PSRR AVO
Min Min Min (nV/
(dB) (dB) @ 1 kHz
Noise
Price
@ 1k
(OEM $US)
Part
Number
No. of
Amps
V
OS Max
(mV) (mv/°C Typ)
TcVOS
IS/Amp
(mA Max)
Process
Rail-to-Rail1
A
√
H
z)
IB Max
Packaging
AD8603
AD8607
AD8609
AD8605
AD8606
AD8608
AD8663
AD8667
AD8669
AD8657
AD8659*
ADA4627-1A
AD8651
AD8652
AD8510B
AD8512B
AD8601A
AD8602A
AD8604A
AD8615
AD8616
AD8618
AD8627
AD8626
AD8625
AD8641
AD8642
AD8643
ADA4075-2
AD8500
AD8510A
AD8512A
AD8513A
AD8682
AD8684
1
2
4
1
2
4
1
2
4
2
4
1
1
2
1
2
1
2
4
1
2
4
1
2
4
1
2
4
2
1
SOT-23
0.68
1.02
1.85
0.68
1.19
1.58
1.17
1.58
2.70
0.95
1.35
6.75
1.13
1.99
2.33
4.76
0.62
0.83
1.13
0.76
1.29
2.29
1.60
2.63
4.09
1.47
2.35
3.85
0.75
0.71
0.95
1.49
3.71
1.66
2.44
CMOS
CMOS
CMOS
1.8/6
2.7/6
5/16
0.3
0.3
0.3
1
1
RRIO
RRIO
0.4
10
0.1
5
85
85
87
80
80
95
112
109
115
25
8
0.040
1 pA
1 pA
MSOP/SOIC
SOIC/TSSOP
WLCSP/SOT-23
1.200
WLCSP/MSOP/SOIC
SOIC/TSSOP
SOIC/LFCSP
MSOP/SOIC
SOIC/TSSOP
MSOP/SOIC
SOIC/LFCSP
SOIC/LFCSP
MSOP/SOIC
MSOP/SOIC
MSOP/SOIC
MSOP/SOIC
SOT-23
0.3 pA
typ
1.5
SS
0.54
0.6
23
0.285
CMOS
JFET
2.7/18
64/618
2.7/5.5
0.3
0.3
4
1
4
RRIO
0.175
19
0.3
84
41
95
100
80
105 110
103 106
50
6.1
4.52
0.022
7.500
5 pA
5 pA
CMOS
0.35
RRIO
50
76
86
100
101
14.000 10 pA
JFET
0.4
0.5
1
2
8
20
86
74
8
2.500
1.200
80 pA
60 pA
65/618
CMOS
2.7/6
RRIO
RRIO
SS
8.2
5.2
67
70
80
90
89
33
MSOP/SOIC
SOIC/TSSOP
SOT-23
CMOS
JFET
JFET
2.7/6
0.5
1.5
2.5
2.5
24
5
12
5
80
76
90
105
103
106
10
16
1.300
0.850
0.290
1 pA
1 pA
1 pA
MSOP/SOIC
SOIC/TSSOP
SC70/SOIC
MSOP/SOIC
SOIC/TSSOP
SC70/SOIC
MSOP/SOIC
SOIC/LFCSP
SOIC/LFCSP
SC70
MSOP/SOIC
MSOP/SOIC
SOIC/TSSOP
MSOP/SOIC
SOIC/TSSOP
0.75
0.75
65/613
62.5/613
SS
3.5
6.5
3
27.5
Bipolar
CMOS
1
1
0.3
3
12
110
75
106 114
90
2.8
190
2.250 100 nA
0.001
64.5/618
61.8/65.5
RRIO
0.007 0.004
98
10 pA
JFET
1
1
1.7
10
8
20
9
86
70
86
101
8
2.500
80 pA
65/618
2
4
JFET
3.5
92
86
36
0.250
20 pA
64.5/618
*Prerelease
1 RRIO: rail-to-rail input/output, RRO: rail-to-rail output, SS: single supply (IVR includes –VSY).
Operational Amplifier Selection Guide
20
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ADI [ ADI ]
