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 OPAx863A devices are low-power, unity-gain

stable, rail-to-rail input and output, voltage-feedback

operational amplifiers, trimmed in package to offer

high precision performance with 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

devices offer a gain-bandwidth product of 50-MHz,

slew rate of 100-V/μs with 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 gain-bandwidth product and

noise across the full input common-mode voltage

range, enabling superior performance with wide-input

dynamic range.

The OPAx863A devices include overload power

limiting to limit the increase in IQ with saturated

outputs, thereby preventing excessive power

dissipation in power conscious battery-operated

systems. The output stage is short-circuit protected,

making it conducive to ruggedized environments.