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.