Analog Audio Amplifier Front-end Reference Design with Improved Noise and Distortion
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Key Document


The Analog Audio Amplifier Front-end Reference Design demonstrates how to build an audio front end for the TPA32xx class-D amplifier. The AUDIO-OPA1632EVM is the board that was designed to test the results of this design. Design files for the board are available in the reference design product folder. This design utilizes a standard Audio Interface Board (AIB) connector to drive two differential audio inputs of a TPA32xx EVM. The audio front end has selectable gains of 0, 6, and 12 dB and converts two single-ended audio signals into two fully differential signals driving the inputs of the TPA32xx. The distortion and noise performance (THD+N ratio) of the audio front end is significantly better than the THD+N ratio of the TPA32xx, which ensures that the audio front end does not degrade the performance of the overall system.

  • Single-ended-to-differential conversion with single fully-differential amplifier optimizes THD+N ratio
  • Four parallel connectors for analog inputs: XLR, ¼”-stereo phone, RCA, and SMA jacks
  • Gain is adjustable to 0 dB, 6 dB, and 12 dB
  • The front end accepts differential inputs in addition to single-ended inputs
  • 100-kHz bandwidth matching bandwidth of TPA32xx

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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA1632  Fully Differential I/O Audio Amplifier  Operational amplifiers (op amps)  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA1632 Download Download
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Technical documentation

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Data sheet (1)
Title Type Size (KB) Date
PDF 1964 29 Oct 2015
User guide (2)
Title Type Size (KB) Date
PDF 722 03 Aug 2018
PDF 2451 13 Apr 2018
Design files (6)
Title Type Size (KB) Date
PDF 1011 03 Aug 2018
ZIP 3019 03 Aug 2018
ZIP 1184 03 Aug 2018
PDF 79 03 Aug 2018
ZIP 862 03 Aug 2018
PDF 199 03 Aug 2018

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