The TAS5706A/B is a 20-W, efficient, digital audio power amplifier for driving stereo bridged-tied speakers. Two serial data inputs allow processing of up to four discrete audio channels and seamless integration to most digital audio processors and MPEG decoders, accepting a wide range of input data and clock rates. A fully programmable data path allows these channels to be routed to the internal speaker drivers or output via the subwoofer or headphone PWM outputs.

The TAS5706A/B is a slave-only device receiving all clocks from external sources. The TAS5706A/B operates at a 384-kHz switching rate for 32-, 48-, 96-, and 192-kHz data, and at a 352.8 kHz switching rate for 44.1-, 88.2-, and 176.4-kHz data. The 8× oversampling combined with the fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

• Audio Input/Output
  • 20-W into an 8- Load From an 18-V Supply
  • Two Serial Audio Inputs (Four Audio Channels)
• TAS5706A Supports:
  • 2-Ch Bridged Outputs (20 W × 2)
• TAS5706B Supports:
  • 2-Ch Bridged Outputs (20 W × 2)
  • 4-Ch Single-Ended Outputs (10 W × 4)
  • 2-Ch Single-Ended + 1-Ch Bridged (2.1 Mode) (10 W × 2 + 20 W)
• Supports 32-kHz-192-kHz Sample Rates (LJ/RJ/I2S)
• Closed Loop Power Stage Architecture
  • Improved PSRR Reduces Power Supply Performance Requirements
  • Higher Damping Factor Provides for Tighter, More Accurate Sound With Improved Bass Response
  • Constant Output Power Over Variation in Supply
• Wide PVCC Range From (10 V to 26 V)
  • No Separate Supply Required for Gate Drive
• Headphone PWM Outputs
• Subwoofer PWM Outputs
• AM Interference Avoidance Support
• Audio/PWM Processing
  • Independent Channel Volume Controls With 48-dB to -79-dB Range—Soft Mute (50% Duty Cycle)
  • Programmable Dynamic Range Control
  • 7 Programmable Biquads for Speaker Equalization for Left and Right Channels
  • 4 Programmable Biquads for Bass Processing
  • Adaptive Biquad Coefficients for EQ and DRC Filters
  • Programmable Input and Output Mixers
  • Automatic Sample-Rate Detection and Coefficient Banking
• General Features
  • Serial Control Interface Operational Without MCLK
  • Factory-Trimmed Internal Oscillator Avoids the Need for External Crystal
  • Surface Mount, 64-Terminal, 10-mm × 10-mm HTQFP Package
  • Thermal and Short-Circuit Protection

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