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 and HD3: –129 dBc and –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.