Precision Amplifiers (VOS < 1 mV, Bandwidth < 50 MHz)
/Amp
Low Power (IS
≤ 1 mA) Amplifiers
AD8500: Micorpower, Precision CMOS Operational Amplifier
The AD8500 is a low power, precision CMOS op amp featuring a maximum supply current of 1 mA. The AD8500 has a maximum offset voltage of 1 mV
and a typical input bias current of 1 pA, and it operates rail-to-rail on both the input and output. The AD8500 can operate from a single-supply voltage of
+1.8 V to +5.5 V or a dual-supply voltage of 60.9 V to 62.75 V.
Features
ESD DEFIB
PROTECTION DEVICE
•ꢀSupply current: 1 mA maximum
108pF
GAIN = 22.05
•ꢀOffset voltage: 1 mV maximum
10kꢀ
475ꢀ
ANTIALIAS FILTER
–3dB, 1592Hz
•ꢀSingle-supply or dual-supply operation
•ꢀRail-to-rail input and output
•ꢀNo phase reversal
HIGH-PASS POLE
0.05Hz
AD623
G = 10.06
AD8641
RA
ELECTRODE
LL
MICRO-
CONTROLLER
ADDITIONAL
DIGITAL FILTER
AD7466 OR
AD7685*
4.7ꢁF
ELECTRODE
681kꢀ
LEVEL SHIFT
ANTIALIAS
•ꢀUnity-gain stable
5.23kꢀ 5.23kꢀ
TOTAL GAIN ≈ 220
Applications
5pF
AGND
•ꢀPortable equipment
•ꢀRemote sensors
•ꢀLow power filters
•ꢀThreshold detectors
499kꢀ
ADF702x*
115kꢀ
RL
ELECTRODE
AD8500
249kꢀ
ECG signal chain using a micropower precision CMOS op amp.
Low Power (IS/AMP≤ 1mA) Amplifiers
Supply
Voltage
(Min/Max)
BW @
Slew
TcVOS CMRR PSRR AVO
(mv/°C Min
Noise
IB Max
Price
@ 1k
(OEM $US)
Part
Number
No. of
Amps
IS/Amp
(mA Max)
VOS Max
(mV)
Process
Rail-to-Rail1 ACL Min Rate
Min Min (nV/
√
H
z)
Packaging
(pA)
(MHz) (V/ms)
Typ)
(dB)
(dB) (dB) @ 1 kHz
CMOS
CMOS
AD8500
1
1.8/5.5
1.8/5.5
0.001
0.001
RRIO
RRIO
0.007
0.007
0.004
0.004
1
3
3
75
90
85
98
98
190
190
10
10
SC70
0.71
AD8502
AD8504
2
4
SOT-23
TSSOP
0.70
1.00
5
67
*
ADA4505-1
1
2
4
WLCSP/SOT-23
WLCSP/MSOP
WLCSP/TSSOP
0.55
0.67
1.15
CMOS
CMOS
CMOS
CMOS
CMOS
ADA4505-2
ADA4505-4
1.8/5.5
1.8/5.5
1.8/5.5
2.7/18
1.8/6
0.010
0.017
0.020
0.022
0.040
RRIO
RRIO
RRIO
RRIO
RRIO
0.050
0.125
0.095
0.175
0.4
0.006
0.06
0.013
0.3
3
0.015
2.5
2
90
100
110
100
105
80
105
115
105
110
112
65
95
45
50
25
2
70
10
5
ADA4051-1
ADA4051-2
1
2
SC70/SOT-23
MSOP/LFCSP
0.93
1.47
0.02
2
110
90
AD85052
AD8506
AD8508
1
2
4
WLCSP/SOT-23
WLCSP/MSOP
WLCSP/TSSOP
0.59
0.71
1.20
AD8657
AD8659*
2
4
MSOP/SOIC
SOIC/LFCSP
0.95
1.35
0.3
4
95
AD8603
AD8607
AD8609
1
2
4
SOT-23
MSOP/SOIC
SOIC/TSSOP
0.68
1.02
1.85
0.1
0.3
1
85
1
AD8613
AD8617
AD8619
1
2
4
SC70/SOT-23
MSOP/SOIC
SOIC/TSSOP
0.46
0.71
1.11
CMOS
1.8/5.5
0.040
RRIO
0.4
0.1
2.2
1
68
67
107
25
1
AD8541
AD8542
AD8544
1
2
4
SC70/SOT-23/SOIC
MSOP/SOIC/TSSOP
SOIC/TSSOP
0.27
0.38
0.54
CMOS
CMOS
2.7/6
0.045
0.180
RRIO
RRIO
1
0.92
0.35
6
4
40
65
86
40
50
60
25
AD8538
AD8539
2
4
SOT-23/SOIC
MSOP/SOIC
0.90
1.31
2.7/5.5
0.43
0.013
0.03
115
105
115
ADA4062-2A
ADA4062-4A
2
4
MSOP/SOIC/LFCSP
LFCSP/TSSOP
0.75
1.21
JFET
JFET
CMOS
0.220
0.220
0.225
1.4
1.4
3.6
3.3
3.3
1.3
2.5
1.5
2.5
4
4
1
73
80
75
74
80
80
76
76
95
36
36
16
50
50
5
64/618
64/618
2.7/6
ADA4062-2B
2
SOIC
1.25
ADA4692-2
ADA4692-4
2
4
SOIC/LFCSP
TSSOP
0.55
0.90
SS
SS
ADA4691-2SD
ADA4691-4SD
2
4
WLCSP/LFCSP
LFCSP
0.57
0.99
CMOS
JFET
2.7/6
0.225
0.250
3.6
4
1.3
9
2.5
3
1
75
70
80
95
86
16
36
5
OP282
OP482
2
4
MSOP/SOIC
SOIC/PDIP
1.31
2.06
10
110
100
64.5/618
*Prerelease
www.analog.com/opamps
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