GENERAL DESCRIPTION

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swings 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 AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices’ topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/AD8629/AD8630 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.

FEATURES

Lowest auto-zero amplifier noise

Low offset voltage: 1 μV

Input offset drift: 0.002 μV/°C

Rail-to-rail input and output swing

5 V single-supply operation

High gain, CMRR, and PSRR: 120 dB

Very low input bias current: 100 pA max

Low supply current: 1.0 mA

Overload recovery time: 10 μs

No external components required

APPLICATIONS

Automotive sensors

Pressure and position sensors

Strain gage amplifiers

Medical instrumentation

Thermocouple amplifiers

Precision current sensing

Photodiode amplifier