Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifiers
AD8571/AD8572/AD8574
Rev. B
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FEATURES
Low offset voltage: 1 μV
Input offset drift: 0.005 μV/°C
Rail-to-rail input and output swing
5 V/2.7 V single-supply operation
High gain, CMRR, PSRR: 130 dB
Ultralow input bias current: 20 pA
Low supply current: 750 μA/op amp
Overload recovery time: 50 μs
No external capacitors required
APPLICATIONS
Temperature sensors
Pressure sensors
Precision current sensing
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
GENERAL DESCRIPTION
This family of amplifiers has ultralow offset, drift, and bias
current. The AD8571, AD8572, and AD8574 are single, dual,
and quad amplifiers, respectively, featuring rail-to-rail input
and output swings. All are guaranteed to operate from 2.7 V to
5 V single supply.
The AD857x family provides benefits previously found only in
expensive auto-zeroing or chopper-stabilized amplifiers. Using
Analog Devices, Inc. topology, these zero-drift amplifiers
combine low cost with high accuracy. (No external capacitors
are required.) Using a patented spread-spectrum auto-zero
technique, the AD857x family eliminates the intermodulation
effects from interaction of the chopping function with the
signal frequency in ac applications.
With an offset voltage of only 1 µV and drift of 0.005 µV/°C, the
AD857x family is perfectly suited for applications where error
sources cannot be tolerated. Position and pressure sensors,
medical equipment, and strain gage amplifiers benefit greatly
from nearly zero drift over their operating temperature range.
Many more systems require the rail-to-rail input and output
swings provided by the AD857x family.
PIN CONFIGURATIONS
V+
OUT A
NC
NC
NC = NO CONNECT
–IN A
+IN A
V–
NC
8
7
6
5
1
2
3
4
AD8571
TOP VIEW
(Not to Scale)
1104-001
NC = NO CONNECT
AD8571
TOP VIEW
(Not to Scale)
NC
1
IN A
2
+IN A
3
V–
4
NC
V+
OUT A
NC
8
7
6
5
01104-004
Figure 1. 8-Lead MSOP
(RM Suffix)
Figure 2. 8-Lead SOIC
(R Suffix)
–IN A
+IN A
V–
OUT B
–IN B
+IN B
OUT A V+
1
2
3
4
8
7
6
5
AD8572
TOP VIEW
(Not to Scale)
01104-002
–IN A
+IN A
V–
OUT B
–IN B
+IN B
OUT A V+
1
2
3
4
8
7
6
5
AD8572
TOP VIEW
(Not to Scale)
01104-005
Figure 3. 8-Lead TSSOP
(RU Suffix)
Figure 4. 8-Lead SOIC
(R Suffix)
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
OUT D
–IN D
+IN D
V–
+IN C
14
13
12
11
10
–IN B
6
OUT B
7
–IN C
OUT C
9
8
AD8574
TOP VIEW
(Not to Scale)
01104-003
OUT A 1
–IN A 2
+IN A
3
V+ 4
+IN B 5
OUT D
–IN D
+IN D
V–
+IN C
14
13
12
11
10
–IN B 6
UT B 7
–IN C
OUT C
9
8
AD8574
TOP VIEW
(Not to Scale)
1104-006
Figure 5. 14-Lead TSSOP
(RU Suffix)
Figure 6. 14-Lead SOIC
(R Suffix)
The AD857x family is specified for the extended industrial/
automotive (−40°C to +125°C) temperature range. The AD8571
single amplifier is available in 8-lead MSOP and narrow 8-lead
SOIC packages. The AD8572 dual amplifier is available in
8-lead narrow SOIC and 8-lead TSSOP surface mount packages.
The AD8574 quad amplifier is available in narrow 14-lead SOIC
and 14-lead TSSOP packages.
