AD8574_15 Datasheet, PDF (1/24 Pages) Analog Devices – Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers

Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifiers
AD8571/AD8572/AD8574
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, 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
NC 1
8 NC
–IN A 2 ^AD8571 7 V+
+IN A
3
TOP VIEW
(Not to Scale)
6
OUT A
V– 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead MSOP (RM Suffix)
NC 1
8 NC
–IN A 2 _AD8571 7 V+
+IN A 3 TOP VIEW 6 OUT A
V– 4 ^{(Not to Scale)} 5 NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC (R Suffix)
OUT A 1
8 V+
–IN A 2 ^AD8572 7 OUT B
+IN A
3
TOP VIEW
(Not to Scale)
6
–IN B
V– 4
5 +IN B
Figure 3. 8-Lead TSSOP (RU Suffix)
OUT A 1
8 V+
–IN A 2 ^AD8572 7 OUT B
+IN A
3
TOP VIEW
(Not to Scale)
6
–IN B
V– 4
5 +IN B
Figure 4. 8-Lead SOIC (R Suffix)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 _AD8574 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 ^{(Not to Scale)} 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead TSSOP (RU Suffix)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 _AD8574 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 ^{(Not to Scale)} 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 6. 14-Lead SOIC (R Suffix)
The AD857x family is 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.
Rev. E
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