OPA1637 High-fidelity, high-voltage (36-V), low-noise (3.7-nV/rtHz) Burr-Brown™ audio fully-differential amp | TI.com

This product is prototype/experimental and has not been released to the market. Testing and final processes may not be complete. This product may be subject to further changes or possible discontinuation.
High-fidelity, high-voltage (36-V), low-noise (3.7-nV/rtHz) Burr-Brown™ audio fully-differential amp


Sample availability

Preproduction samples are available (XOPA1637DGKR). Request now


The OPA1637 is a low-noise, low total harmonic distortion (THD), Burr-Brown™ fully differential amplifier that easily filters and drives fully differential, audio signal chains. The OPA1637 is also used to convert single-ended sources to differential outputs required by high-fidelity analog-to-digital 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 high-gain 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.


  • Low input voltage noise: 3.7 nV/√Hz at 1 kHz
  • Low THD + N: –120 dB at 10 kHz
  • Low supply current: 950 µA at ±18 V
  • Input offset voltage: ±200 µV (maximum)
  • Input bias current: 2 nA (maximum)
  • 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
  • Amplifier overload power limit
  • Current limit
  • Package: 8-pin VSSOP
  • Temperature range: –40°C to +125°C

All trademarks are the property of their respective owners.


Compare all products in Audio op amps Email Download to Excel
Part number Order Number of channels (#) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) GBW (Typ) (MHz) Slew rate (Typ) (V/us) Rail-to-rail Vos (offset voltage @ 25 C) (Max) (mV) Iq per channel (Typ) (mA) Vn at 1 kHz (Typ) (nV/rtHz) Features THD + N @ 1 kHz (Typ) (%) Rating Operating temperature range (C) Package Group Output current (Typ) (mA) Package size: mm2:W x L (PKG) Architecture CMRR (Typ) (dB) Input bias current (Max) (pA)
OPA1637 Order now 1     3     36     9.2     15       0.2     0.95     3.7     Burr-Brown™ Audio
Premium Sound    
0.0001     Catalog     -40 to 125     VSSOP | 8     31     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)     Bipolar     140     2000    
OPA1632 Order now 1     5     30     180     50     No     3     14     1.3     Burr-Brown™ Audio
0.000022     Catalog     -40 to 85     HVSSOP | 8
SOIC | 8    
85     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
Voltage FB     90     200000