20-W Open-Loop Stereo Digital Input Class-D Audio Amplifier with Speaker EQ and DRC

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Features

  • Audio Input/Output
    • 20-W Into an 8- Load From an 18-V Supply
    • Wide PVDD Range, From 8 V to 26 V
    • Efficient Class-D Operation Eliminates Need for Heatsinks
    • Requires Only 3.3 V and PVDD
    • One Serial Audio Input (Two Audio Channels)
    • Supports 8-kHz to 48-kHz Sample Rate (LJ/RJ/I2S)
  • Audio/PWM Processing
    • Independent Channel Volume Controls With 24 dB to Mute
    • Soft Mute (50% Duty Cycle)
    • Programmable Dynamic Range Control
    • 14 Programmable Biquads for Speaker EQ and Other Audio Processing Features
    • Programmable Coefficients for DRC Filters
    • DC Blocking Filters
  • General Features
    • Serial Control Interface Operational Without MCLK
    • Factory-Trimmed Internal Oscillator for Automatic Rate Detection
    • Surface Mount, 48-PIN, 7-mm × 7-mm HTQFP Package
    • Thermal and Short-Circuit Protection
  • Benefits
    • EQ: Speaker Equalization Improves Audio Performance
    • DRC: Dynamic Range Compression. Can Be Used As Power Limiter. Enables Speaker Protection, Easy Listening, Night-Mode Listening
    • Autobank Switching: Preload Coefficients for Different Sample Rates. No Need to Write New Coefficients to the Part When Sample Rate Changes.
    • Autodetect: Automatically Detects Sample-Rate Changes. No Need for External Microprocessor Intervention
  • APPLICATIONS
    • Television
    • iPod Dock
    • Sound Bar

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Description

The TAS5707 is a 20-W, efficient, digital-audio power amplifier for driving stereo bridge-tied speakers. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers.

The TAS5707 is a slave-only device receiving all clocks from external sources. The TAS5707 operates with a PWM carrier between a 384-kHz switching rate and 352-KHz switching rate, depending on the input sample rate. Oversampling combined with a fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20  kHz.

The TAS5707A is identical in function to the HTQFP packaged TAS5707, but has a unique I2C device address. The address of the TAS5707 is 0x36. The address of the TAS5707A is 0x3A.

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For a 23W 96kHz closed-loop inductor-less Stereo Class-D audio amplifier, with a lower total solution cost, see TAS5805M

For a higher performance 38W 192kHz closed-loop inductor-less , small solution size Stereo Class-D audio amplifier with flexible processing, seeTAS5825M

Technical documentation

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Type Title Date
* Datasheet 20-W STEREO DIGITAL AUDIO POWER AMPLIFIER WITH EQ AND DRC, datasheet (Rev. B) Nov. 09, 2009
Application notes Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) Aug. 26, 2019
Application notes AN-1849 An Audio Amplifier Power Supply Design (Rev. C) Jun. 27, 2019
User guides TAS5707/09EVM - User Guide (Rev. C) Oct. 03, 2014
Application notes AN-1737 Managing EMI in Class D Audio Applications (Rev. A) May 01, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

The TAS5707 evaluation module (EVM) demonstrates the TAS5707 device from Texas Instruments.

The TAS5707EVM demonstrates a high-performance 20-W digital-input audio power amplifier. This EVM can be configured with two bridge-tied loads (BTL). For detailed information about the TAS5707 device, review (...)

Features
  • Includes a 20-W digital-input audio power amplifiers in a 48-pin QFP
  • Includes the MC57xxPSIA Controller board
  • Self-contained protection systems and control pins
  • Standard optical S/PDIF data input using the DIR9001
  • Analog input through the PCM1808 analog-to-digital converter (ADC)
  • Access to internal (...)

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