1 Features

• Ultra-low noise:

– Voltage noise: 2.9 nV/√Hz at 10 kHz

– Current noise: 6 fA/√Hz at 1 kHz

• Low distortion:

– 0.000029 (–131 dB) at 1 kHz

– 0.000035 (–129 dB) at 20 kHz

• High open-loop gain: 150 dB

• High output current: 100 mA

• Low input bias current: 10 pA

• Slew rate: 24 V/μs

• Gain bandwidth product: 53 MHz

• Rail-to-rail output

• Wide supply range:

±2.25 V to ±18 V or 4.5 V to 36 V

• Quiescent current: 3.9 mA per channel

2 Applications

• Professional microphones and wireless systems

• Professional audio mixer/control surface

• Guitar amplifier and other music instrument

amplifier

• A/V receiver

• Bookshelf stereo system

• Professional audio amplifier

• DJ equipment

• Turntable

• Special function module

3 Description

The OPA1655 and OPA1656 (OPA165x) are Burr-

Brown™ op amps designed specifically for audio

and industrial applications, where maintaining signal

fidelity is crucial. The FET-input architecture achieves

a low 2.9‑nV/√Hz voltage noise density and 6‑fA/√Hz

current noise density, allowing for very-low noise

performance in a wide variety of circuits. The high

bandwidth and high open-loop-gain design of the

OPA165x delivers a low distortion of 0.000035

(–129 dB) at 20 kHz, and improves audio signal

fidelity across the full audio bandwidth. These devices

also feature excellent output current drive capability,

offering rail-to-rail output swing to within 250 mV of

the power supplies with a 2‑kΩ load, and can deliver

100 mA of output current.

The OPA165x operate over a very wide supply range

of ±2.25 V to ±18 V or (4.5 V to 36 V) on 3.9 mA

of supply current to accommodate the power-supply

constraints of many types of audio products. The

temperature range is specified from –40°C to +125°C.