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Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifier
Data Sheet AD8629-EP
Rev. A Document Feedback
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FEATURES
Lowest auto-zero amplifier noise
Low offset voltage: 1 μV typical
Input offset drift: 0.002 μV/°C typical
Rail-to-rail input and output swing
5 V single-supply operation
High gain, CMRR, and PSRR: 130 dB
Very low input bias current: 100 pA maximum
Low supply current: 1.0 mA
Overload recovery time: 50 μs
No external components required
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended temperature range: −55°C to +125°C
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifiers
PIN CONFIGURATION
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8629-EP
TOP VIEW
(Not to Scale)
12890-001
Figure 1. 8-Lead SOIC_N (R-8)
GENERAL DESCRIPTION
The AD8629-EP amplifier has ultralow offset, drift, and bias
current. The device is a wide bandwidth auto-zero amplifier
featuring rail-to-rail input and output swing and low noise.
Operation is fully specified from 2.7 V to 5 V single supply
(±1.35 V to ±2.5 V dual supply).
The AD8629-EP provides benefits previously found only in
expensive auto-zeroing or chopper-stabilized amplifiers. Using
Analog Devices, Inc., topology, this zero-drift amplifier
combines low cost with high accuracy and low noise. No
external capacitor is required. In addition, the AD8629-EP
greatly reduces the digital switching noise found in most
chopper-stabilized amplifiers.
With an offset voltage of only 1 µV, drift of less than 0.05 V/°C,
and noise of only 0.5 µV p-p (0 Hz to 10 Hz), the AD8629-EP is
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 the
operating temperature range. Many systems can take advantage
of the rail-to-rail input and output swings provided by the
AD8629-EP to reduce input biasing complexity and maximize
SNR.
The AD8629-EP is specified for the extended industrial
temperature range (−55°C to +125°C). The AD8629-EP is
available in a standard 8-lead narrow SOIC plastic package.