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.