Stereo Evaluation Module Reference Design of the Digital Input, Class-D, IV Sense Audio Amplifier


Design files


This reference design provides a high-performance stereo audio subsystem for use in PC applications. It operates off a single supply, ranging from 4.5 V to 16 V, and features the TAS2770, a digital-input Class-D audio amplifier that provides excellent noise and distortion performance and is available in both WCSP and QFN packages. The design also includes two low-dropout fixed voltage regulators, the TL760M33 and TPS73618, which generate the necessary 3.3 V and 1.8 V system rails, respectively. The reference design’s versatile digital-input interface allows for a wide variety of input formats, while providing output data for voltage and current sense, supply voltage (VBAT) and temperature. The reference design also includes multiplexing to allow multiple input sources to the digital inputs. Additionally, the TAS2770 incorporates an automatic gain controller that can track VBAT to limit the output voltage, as desired. This function can help extend the battery life of battery-powered applications, such as laptops and tablets, and prevent system-level brownout. Inter-chip limiter alignment can be configured on multiple TAS2770 devices to coordinate limiter activity using a shared digital output. This will ensure that the entire system maintains comparable gain levels at all times to provide the best listening experience.

  • Stereo or Mono evaluation mode
  • USB input
  • IV sense evaluation mode
  • Interface to TAS2559YZEVM for speaker protection evaluation
  • Access to TAS2770 add-in PurePath Console 3
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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.

TIDUDP1.PDF (4039 K)

Reference design overview and verified performance test data

TIDRW51.PDF (633 K)

Detailed schematic diagram for design layout and components

TIDRW52.PDF (74 K)

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

TIDRW53.PDF (469 K)

Detailed overview of design layout for component placement

TIDRW55.ZIP (2934 K)

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

TIDCEM8.ZIP (1650 K)

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

TIDRW54.PDF (2766 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Speaker amps

TAS277020-W, digital input, 4.5- to 18-V smart amp with I/V sense for speaker protection

Data sheet: PDF | HTML
Analog switches & muxes

SN74CB3Q32573.3-V, 2:1 (SPDT), 4-channel general-purpose FET bus switch

Data sheet: PDF | HTML
Analog switches & muxes

SN74LVC2G665-V, 1:1 (SPST), 2-channel general-purpose analog switch with low on-state resistance

Data sheet: PDF | HTML
Analog switches & muxes

TMUX15745-V, 2:1 (SPDT), 4-channel analog switch with powered-off protection & 1.8-V input logic

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS620853-A Step-Down Converter with DCS-Control and Hiccup Short Circuit Protection in 2x2 HotRod Package

Data sheet: PDF | HTML
Clock generators

CDCE913Programmable 1-PLL VCXO clock synthesizer with 2.5-V or 3.3-V LVCMOS outputs

Data sheet: PDF | HTML
Direction-controlled voltage translators

SN74AVC4T774Four-bit dual-supply bus transceiver with configurable voltage-level shifting and tri-state outputs

Data sheet: PDF | HTML
Fixed-direction voltage translators

SN74AVC2T244Dual-Bit Dual-Supply Bus Transceiver

Data sheet: PDF | HTML
Fixed-direction voltage translators

SN74LV1T126Single Power Supply, Single BUFFER GATE w/ 3-State Output (active high enable)

Data sheet: PDF | HTML
I2C & I3C level shifters, buffers & hubs

TCA94062-bit bidirectional 1MHz I2C/SMBus voltage level translator with internal pull-up resistor

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TL760M33-Q1Automotive 500-mA, 26-V, high-accuracy, low-dropout voltage regulator

Data sheet: PDF
Linear & low-dropout (LDO) regulators

TPS736400-mA, high-accuracy, ultra-low-dropout voltage regulator with reverse current protection & enable

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC2G072-ch, 1.65-V to 5.5-V buffers with open-drain outputs

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3897Single-channel, ultra-small, adjustable supervisor with active-high, open-drain output

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Stereo Audio Subsystem Reference Design Apr. 20, 2018

Related design resources

Hardware development

TAS2770EVM-STEREO Stereo Evaluation Module of the TAS2770 Digital Input, Class-D, IV Sense Audio Amplifier

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