1 Features

• Wide-bandwidth

– Unity-gain bandwidth: 110-MHz (AV= 1 V/V)

– Gain-bandwidth product: 50-MHz

• Low power

– Quiescent current: 700-μA/ch (typical)

– Power down mode: 1.5-μA (maximum, VS= 3 V)

– Supply voltage: 2.7-V to 12.6-V

• Input voltage noise: 5.9-nV/√Hz

• Slew rate: 105-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

• High-precision version: OPAx863A

2 Applications

• Low-power SAR and ΔΣ ADC driver

• ADC reference buffer

• Low-side current sensing

• Photodiode TIA interface

• Inductive sensing

• Ultrasonic flow meter

• Multifunction printer

• MDAC output buffer

• Gain and active filter stages

3 Description

The OPAx863 devices are low-power, unity-gain

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

operational amplifiers designed to operate over a

power-supply range of 2.7 V to 12.6 V. Consuming

only 700 μA per channel, the OPAx863 offers a gainbandwidth

product of 50 MHz, slew rate of 105 V/μs

with a voltage noise density of 5.9 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

OPAx863 feature a power-down (PD) mode with a

PD quiescent current (IQ) of 1.5-μA (maximum) and

a turn-on or turn-off time within 6.5-μs using a 3-V

supply.

The OPAx863 includes 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.