TAS5508 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Similar but not functionally equivalent to the compared device:
TAS5548 ACTIVE 96KHz PWM modulator with integrated ASRC & audio processor 8 channel, 96KHz, PWM modulator with integrated ASRC & audio processor

Product details


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  • General Features
    • Automated Operation With an Easy-to-Use Control Interface
    • I2C Serial-Control Slave Interface
    • Integrated AM Interference-Avoidance Circuitry
    • Single, 3.3-V Power Supply
    • 64-Pin TQFP Package
    • 5-V Tolerant Inputs
  • Audio Input/Output
    • Automatic Master Clock Rate and Data Sample Rate Detection
    • Eight Serial Audio Input Channels
    • Eight PWM Audio Output Channels Configurable as
      Six Channels With Stereo Lineout or Eight channels
    • Line Output is a PWM Output to Drive an External
      Differential-Input Operational Amplifier
    • Headphone PWM Output to Drive an External
      Differential Amplifier Like the TPA112
    • PWM Outputs Support Single-Ended and
      Bridge-Tied Loads
    • 32-, 38-, 44.1-, 48-, 88.2-, 96-, 176.4-, and
      192-kHz Sampling Rates
    • Data Formats: 16-, 20-, or 24-Bit Left-Justified,
      I2S, or Right-Justified Input Data
    • 64-Fs Bit-Clock Rate
    • 128-, 192-, 256-, 384-, 512-, and 768-Fs Master
      Clock Rates (Up to a Maximum of 50 MHz)
  • Audio Processing
    • 48-Bit Processing Architecture With 76 Bits
      of Precision for Most Audio Processing Features
    • Volume Control Range 36 dB to –127 dB
      • Master Volume Control Range of 18 dB
        to –100 dB
      • Eight Individual Channel Volume Control
        Ranges of 18 dB to –127 dB
    • Programmable Soft Volume and Mute Update Rates
    • Four Bass and Treble Tone Controls with
      =18-dB Range, Selectable Corner Frequencies,
      and Second-Order Slopes
      • L, R, and C
      • LS, RS
      • LR, RR
      • Sub
    • Configurable Loudness Compensation
    • Two Dynamic Range Compressors With Two Thresholds,
      Two Offsets, and Three Slopes
    • Seven Biquads Per Channel
    • Full 8 = 8 Input Crossbar Mixer. Each
      Signal-Processing Channel Input Can Be Any
      Ratio of the Eight Input Channels.
    • 8 = 2 Output Mixer – Channels 1–6.
      Each Output Can be Any Ratio of Any Two
      Signal-Processed Channels.
    • 8 = 3 Output Mixer – Channels 7 and 8.
      Each Output Can Be Any Ratio of Any Three
      Signal-Processed Channels.
    • Three Coefficient Sets Stored on the Device
      Can Be Selected Manually or Automatically
      (Based on Specific Data Rates).
    • DC Blocking Filters
    • Able to Support a Variety of Bass
      Management Algorithms
  • PWM Processing
    • 32-Bit Processing PWM Architecture With
      40 Bits of Precision
    • 8= Oversampling With Fifth-Order Noise
      Shaping at 32 kHz–48 kHz, 4=
      Oversampling at 88.2 kHz and 96 kHz, and 2=
      Oversampling at 176.4 kHz and 192 kHz
    • >102-dB Dynamic Range
    • THD+N < 0.1%
    • 20-Hz–20-kHz, Flat Noise Floor for 44.1-, 48-,
      88.2-, 96-, 176.4-, and 192-kHz Data Rates
    • Digital De-Emphasis for 32-, 44.1-, and
      48-kHz Data Rates
    • Flexible Automute Logic With Programmable
      Threshold and Duration for Noise-Free Operation
    • Intelligent AM Interference-Avoidance System
      Provides Clear AM Reception
    • Power-Supply Volume Control (PSVC) Support for
      Enhanced Dynamic Range in High-Performance Applications
    • Adjustable Modulation Limit

PurePath Digital is a trademark of Texas Instruments.
Matlab is a trademark of Math Works, Inc.
All other trademarks are the property of their respective owners.

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The TAS5508 is an 8-channel digital pulse-width modulator (PWM) that provides both advanced performance and a high level of system integration. The TAS5508 is designed to interface seamlessly with most audio digital signal processors. The TAS5508 automatically adjusts control configurations in response to clock and data rate changes and idle conditions. This enables the TAS5508 to provide an easy-to-use control interface with relaxed timing requirements.

The TAS5508 can drive eight channels of H-bridge power stages. Texas Instruments H-bridge parts TAS5111, TAS5112, or TAS5182 with FETs are designed to work seamlessly with the TAS5508. The TAS5508 supports both single-ended or bridge-tied load configurations. The TAS5508 also provides a high-performance, differential output to drive an external, differential-input, analog headphone amplifier (such as the TPA112).

The TAS5508 uses AD modulation operating at a 384-kHz switching rate for 48-, 96-, and
192-kHz data. The 8= oversampling combined with the fifth-order noise shaper provides a broad, flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

The TAS5508 is a clocked slave-only device. The TAS5508 receives MCLK, SCLK, and LRCLK from other system components. The TAS5508 accepts master clock rates of 128, 192, 256, 384, 512, and 768 Fs. The TAS5508 accepts a 64-Fs bit clock.

The TAS5508 allows for extending the dynamic range by providing a power-supply volume control (PSVC) output signal.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet 8 Channel Digital Audio PWM Processor datasheet (Rev. D) Jul. 06, 2009
User guide TAS5508-5121K8EVM User's Guide (Rev. B) Nov. 28, 2007
User guide TAS5508-5122C6EVM User's Guide (Rev. A) Apr. 26, 2006
Application note PSRR for Purepath Digital Audio Amplifiers Apr. 15, 2005
Application note Click and Pop Measurement Technique Apr. 01, 2005
User guide TAS5508-5122C6EVM User's Guide Sep. 10, 2004
Application note PurePath Digital AM Interference Avoidance Aug. 24, 2004
Application note Implementation of Power Supply Volume Control Jun. 23, 2004

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TQFP (PAG) 64 View options

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