Zero-Drift, Single-Supply, Rail-to-Rail

Input/Output Operational Amplifier

Data Sheet

AD8629-EP

Rev. A

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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

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8629-EP

TOP VIEW

(Not to Scale)

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 μV/°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.