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.