1 Features

• Gain-bandwidth product: 50-MHz

• High precision

– Input offset voltage: 95-μV (maximum)

– Offset drift: 1.2-μV/°C (maximum)

• Low power

– Quiescent current: 800-μA/ch (typical)

– Supply voltage: 2.7-V to 12.6-V

• Input voltage noise: 6.3-nV/√Hz

• Slew rate: 100-V/μs

• Rail-to-rail input and output

• HD2/HD3: –129 dBc/–138 dBc at 20 kHz (2-VPP)

• Operating temperature range:

–40°C to +125°C

• Additional features:

– Overload power limit

– Output short-circuit protection

2 Applications

• Low-power SAR and ΔΣ ADC driver

• ADC reference buffer

• Low-side current sensing

• Photodiode TIA interface

• Inductive sensing

• Battery-powered instrumentation

• Gain and active filter stages

3 Description

The OPA863A and OPA2863A devices (OPAx863A)

are low-power, unity-gain stable, rail-to-rail input

and output, voltage-feedback operational amplifiers.

These devices are trimmed in package to offer highprecision

performance with a maximum input offset

voltage of 95 μV and offset drift of 1.2 μV/℃ for high

accuracy measurements over temperature.

Consuming only 800 μA per channel, the OPAx863A

offer a gain-bandwidth product of 50 MHz, slew rate of

100 V/μs, and a voltage noise density of 6.3 nV/√Hz.

The rail-to-rail input stage with 2.7-V supply operation

is useful in portable, battery-powered applications.

The rail-to-rail input stage is well matched for gainbandwidth

product and noise across the full input

common-mode voltage range, enabling excellent

performance with wide-input dynamic range.

The OPAx863A include overload power limiting to limit

the increase in IQ with saturated outputs, thereby

preventing excessive power dissipation in powerconscious,

battery-operated systems. The output

stage is short-circuit protected, making these devices

conducive to ruggedized environments.