1 Features

• Low input voltage noise: 3.7 nV/√Hz at 1 kHz

• Low THD + N: –120 dB at 1 kHz

• Low supply current: 950 μA at ±18 V

• Input offset voltage: ±200 μV (maximum)

• Input bias current: 2 nA (maximum)

• Low bias current noise: 400 fA/√Hz at 10 Hz

• Gain-bandwidth product: 9.2 MHz

• Differential output slew rate: 15 V/μs

• Wide input and output common-mode range

• Wide single-supply operating range: 3 V to 36 V

• Low supply current power-down feature: < 20 μA

• Overload power limit

• Current limit

• Package: 8-pin VSSOP

• Temperature range: –40°C to +125°C

2 Applications

• Professional audio mixer or control surface

• Professional microphones and wireless systems

• Professional speaker systems

• Professional audio amplifier

• Soundbar

• Turntable

• Professional video camera

• Guitar and other instrument amplifier

• Data aquisition (DAQ)

3 Description

The OPA1637 is a low-noise, low total harmonic

distortion (THD), fully differential, Burr-Brown™ Audio

operational amplifier that easily filters and drives fully

differential, audio signal chains.

The OPA1637 also converts single-ended sources to

differential outputs required by high-fidelity analog-todigital

converters (ADCs). Designed for exceptional

low noise and THD, the bipolar super-beta inputs yield

a very low noise figure at very-low quiescent current

and input bias current. This device is designed for

audio circuits where low power consumption is

required along with excellent signal-to-noise ratio

(SNR) and spurious-free dynamic range (SFDR).

The OPA1637 features high-voltage supply capability,

allowing for supply voltages up to ±18 V. This

capability allows high-voltage differential signal chains

to benefit from the improved headroom and dynamic

range without adding separate amplifiers for each

polarity of the differential signal. Very-low voltage and

current noise enables the OPA1637 for use in highgain

configurations with minimal impact to the audio

signal noise.

The OPA1637 is characterized for operation over the

wide temperature range of –40°C to +125°C, and is

available in an 8-pin VSSOP package.