1 Features

• Wide supply voltage: 2.7 V to 24 V

• Rail-to-rail input and output

• Wide bandwidth: 25-MHz GBW, unity-gain stable

• Unlimited capacitive load drive capability

– Phase margin of 60° when driving a load of 10

μF and 1 MΩ

• High output current drive: ±150 mA

• Low offset voltage: ±200 μV (typical)

• Low offset voltage drift: ±0.17 μV/°C (typical)

• Low noise: 12 nV/√Hz at 1 kHz

• High common-mode rejection: 135 dB

• High slew rate: 18 V/μs

• Low quiescent current: 1.25 mA per amplifier

2 Applications

• AC charging (pile) station

• GFCI fault detection and test

• Software defined radio

• Display panel for PC and notebooks

• LCD TV

• Wireless control lighting

• Motor drive: power stage and control modules

• Power delivery: UPS, server, and merchant

network power

• ADC driver and reference buffer amplifier

• High-side and low-side current sensing

3 Description

The OPAx994 family (OPA994 and OPA2994) is a

family of high voltage (24 V) rail-to-rail input and

output (RRIO) operational amplifiers. These devices

offer excellent AC performance, including a wide unity

gain bandwidth of 25-MHz and a high slew rate of 18

V/μs, while only requiring a quiescent current of 1.25

mA per channel.

The OPAx994 family was designed to maintain

stability across a wide range of capacitive loads. For

example, OPAx994 is able to achieve a phase margin

of 60 degrees when driving large capacitive loads of

10 μF with a load resistance of 1 MΩ. The OPAx994

is designed with compensation architectures that

mitigate sustained ringing for large capacitive loads.

This allows for reliable performance and ease of

design for systems that have large, varying, or

unknown capacitive loads.

These devices also offer excellent DC precision,

including a high short-circuit output current of 150

mA/channel, low offset voltage (±200 μV, typ), low

offset drift (±0.17 μV/°C, typ), and high CMRR of 135

dB for high voltage operation within the main input

pair. This makes the OPAx994 a flexible, robust, and

high-performance op amp for high-voltage industrial

applications.