The TAS5508C is an 8-channel digital pulse-width modulator (PWM) that provides both advanced performance and a high level of system integration. The TAS5508C is designed to interface seamlessly with most audio digital signal processors. The TAS5508C automatically adjusts control configurations in response to clock and data rate changes and idle conditions. This enables the TAS5508C to provide an easy-to-use control interface with relaxed timing requirements.

The TAS5508C 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 TAS5508C. The TAS5508C supports both single-ended or bridge-tied load configurations. The TAS5508C also provides a high-performance, differential output to drive an external, differential-input, analog headphone amplifier (such as the TPA112).

The TAS5508C 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 TAS5508C is a clocked slave-only device. The TAS5508C receives MCLK, SCLK, and LRCLK from other system components. The TAS5508C accepts master clock rates of 128, 192, 256, 384, 512, and 768 Fs. The TAS5508C accepts a 64-Fs bit clock.

The TAS5508C allows for extending the dynamic range by providing a power-supply volume control (PSVC) output signal.

• 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

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