Datasheet

Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifiers
Data Sheet
AD8571/AD8572/AD8574
Rev. F Document Feedback
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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: 145 dB typical
CMRR: 140 dB typical
PSRR: 130 dB typical
Ultralow input bias current: 10 pA typical
Low supply current: 750 μA per 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/AD8574
1
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 AD8571/AD8572/AD8574 provide 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 spread-spectrum,
auto-zero technique, the AD8571/AD8572/AD8574 eliminate
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
AD8571/AD8572/AD8574 are 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 AD8571/AD8572/AD8574.
1
Protected by U.S. Patent 6,130,578.
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)
0
1104-001
Figure 1. 8-Lead MSOP (RM Suffix)
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 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
Figure 3. 8-Lead TSSOP (RU 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)
01104-005
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
Figure 5. 14-Lead TSSOP (RU 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
O
UT B 7
–IN C
OUT C
9
8
AD8574
TOP VIEW
(Not to Scale)
0
1104-006
Figure 6. 14-Lead SOIC (R Suffix)
The AD8571/AD8572/AD8574 are specified for the extended
industrial/ automotive temperature range (−40°C to +125°C).
The AD8571 single amplifier is available in 8-lead MSOP and
narrow SOIC packages. The AD8572 dual amplifier is available in
8-lead narrow SOIC and surface-mount TSSOP packages. The
AD8574 quad amplifier is available in 14-lead narrow SOIC and
TSSOP packages.