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


Design files


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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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUD13.PDF (2451 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRWW4.ZIP (1184 K)

Files used for 3D models or 2D drawings of IC components

TIDCEU0.ZIP (3019 K)

Design file that contains information on physical board layer of design PCB

TIDRWW5.PDF (1011 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Audio op amps

OPA1632Fully Differential I/O Audio Amplifier

Data sheet: PDF

Technical documentation

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Type Title Date
* User guide TIDA-01359 EVM User's Guide Aug. 03, 2018
Design guide TIDA-01359 Audio-OPA1632EVM Audio Interface Board Design Guide Apr. 13, 2018

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