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.