1 Features

• Wide supply voltage: 2.7V to 32V

• Rail-to-rail input and output

• Wide bandwidth: 24MHz GBW, unity-gain stable

• Unlimited capacitive load drive capability

– Phase margin of 50° when driving a load of 10

μF and 1MΩ

• High output current drive: ±125mA

• Low offset voltage: ±350μV (typical)

• Low offset voltage drift: ±2.5μV/°C (typical)

• Low noise: 12nV/√Hz at 1 kHz

• High common-mode rejection: 125dB

• High slew rate: 35V/μs

• Low quiescent current: 1.35mA 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 (32V) rail-to-rail input and output

(RRIO) operational amplifiers. These devices offer

excellent AC performance, including a wide unity gain

bandwidth of 24MHz and a high slew rate of 18V/μs,

while only requiring a quiescent current of 1.35mA 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 50 degrees when driving large capacitive loads of

10 μF with a load resistance of 1MΩ. 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 125mA/

channel, low offset voltage (±350μV, typ), low offset

drift (±2.5μV/°C, typ), and high CMRR of 125dB 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.