20-W stereo, 10- to 26-V supply, digital input, closed loop Class-D audio amplifier w/ EQ & DRC


Product details


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HTQFP (PHP) 48 49 mm² 7 x 7 open-in-new Find other Speaker amps


  • Audio Input/Output
    • 20-W Into an 8-Ω Load From an 18-V Supply
    • Wide PVCC Range (10 V to 26 V); 3.3 V Digital Supply
    • Supports One Serial Audio Input (8 kHz - 48 kHz Sample Rates) (LJ/RJ/I2S)
    • Power-Stage Feedback Allows Operation From Poorly Regulated Power Supplies
  • Audio/PWM Processing
    • Factory-Trimmed Internal Oscillator for Automatic Rate Detection
    • High-End 32-Bit Data Path Audio Processor
    • 14 Biquads for Speaker EQ
    • Dynamic Range Control (DRC)
  • Benefits
    • EQ: Speaker Equalization Improves Audio Performance
    • DRC: Enables Speaker Protection and Night-Mode Listening.
    • Autobank Switching: Preloaded Coefficients for Three Different Sample Rates Eliminates the Need to Update Coefficients When Sample Rate Changes
    • Autodetect: Automatically Detects Sample-Rate Changes Eliminating the Need for External Microprocessor Intervention
    • Closed-Loop Power Stage: Enables Wide PVCC Operating Range and Reduced Power Supply Ripple Distortion

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The TAS5708 is a 20-W, efficient, digital audio power amplifier for driving stereo bridge-tied speakers. A 32-bit datapath eliminates the need for pre-scaling before processing and preserves signal integrity without sacrificing dynamic range. A digital audio processor with fully programmable digital filters allows designers to custom tune speakers for optimum sound in small enclosures. A programmable DRC can adjust power levels for a scaleable design while also enabling night-mode listening modes.

The closed-loop architecture allows the device to operate from poorly regulated supplies. Figure 1 below shows the benefit of the feedback architecture when a noisy supply (1kHz, 500mVpp ripple) modulates a 10kHz audio input. The figure shows a 40dB improvement in sideband suppression when compared to an open-loop design. This correlates directly to a 24dB improvement in distortion as seen in Figure 2.

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Technical documentation

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Type Title Date
Application note Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) Aug. 26, 2019
Application note AN-1849 An Audio Amplifier Power Supply Design (Rev. C) Jun. 27, 2019
Application note AN-1737 Managing EMI in Class D Audio Applications (Rev. A) May 01, 2013
User guide TAS5708/10EVM - User Guide (Rev. A) Jan. 30, 2009

Design & development

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Hardware development

document-generic User guide

The TAS5708 evaluation module (EVM) demonstrates the TAS5708 device from Texas Instruments.

The TAS5708EVM 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 TAS5708 device, review (...)

  • 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 (...)

Design tools & simulation

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  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

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