High Fidelity 175W Class-D Audio Amplifier with Digital Inputs and Processing Reference Design

(ACTIVE) TIDA-00874

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Key Document

Description

This design turns the extremely high performance analog input TPA3251 Class-D amplifier into a digital input system with audio processing using the highly versatile PCM5242 differential output DAC. Now the full performance of TPA3251 amplifier can be realized with a variety of digital input sources. The analog differential output and high SNR of the PCM5242 DAC is a perfect match to the fully differential analog input of the TPA3251 amplifier achieving outstanding noise performance and extremely low distortion. With the miniDSP on the PCM5242, audio processing and filtering can be added to further enhance audio performance in the end equipment.

Features
  • High performance and audio fidelity from the TPA3251 with digital sources
  • Accepts USB, Optical, SPDIF and I2S format digital inputs
  • 175W @ 10% THD + N from digital sources
  • Less than 0.004% THD + N 10W into 4ohms
  • miniDSP processing flexibility with PCM5242 DAC
  • Fully differential analog path for noise rejection

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM2940-N  1A Low Dropout Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
LM5010A  6-75V Wide Vin, 1A Constant On-Time Non-Synchronous Buck Regulator  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
PCM5242  4.2-VRMS DirectPath™, 32-bit, 384-kHz, 114-dB Audio Stereo DAC  Audio converters  Sample & Buy View Design Kits & Evaluation Modules
SRC4392  High-end Combo Sample Rate Converter  Audio interface  Sample & Buy View Design Kits & Evaluation Modules
TAS1020B  Stereo USB Audio Interface  Processors  Not Available View Design Kits & Evaluation Modules
TPA3251  175W Stereo / 350W Mono Ultra-HD, Analog-In Class-D Amplifier  Audio amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS736  Single Output LDO, 400mA, Adj.(1.2 to 5.5V), Cap free, Low Noise, Reverse Current Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM2940-N Download Download
Download Download
TO-220 (NEB)| 3 Download
Download Download
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LM5010A Download Download
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PCM5242 Download
SRC4392 Download Download
TAS1020B Download
TPA3251 Download Download
TPS736 Download Download
Download Download
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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 196 18 Dec 2015 0
PDF 2546 19 Jun 2015 0
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1764 18 Dec 2015 0
ZIP 2132 18 Dec 2015 0
PDF 867 18 Dec 2015 0
PDF 595 18 Dec 2015 0
Multiple Files   18 Dec 2015 0
PDF 1223 18 Dec 2015 0
More literature (1)
Title Abstract Type Size (KB) Date Views
PDF 2960 01 Dec 2017 0

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