Audio Amp Headphone/Speaker 2-CH Stereo/3-CH Stereo 20W Class-D 64-Pin HTQFP EP T/R

The TAS5705 is a 20-W, efficient, digital audio power amplifier for driving stereo bridge-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. The device accepts 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 line-level subwoofer or headphone PWM outputs. The TAS5705 is a slave-only device receiving clocks from external sources. The TAS5705 operates at a 384-kHz switching rate for 32-, 48-, 96-,and 192-kHz data and 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 8O Load From an 18-V Supply
• Wide Power-Supply Range From (8 V to 23 V)
• Efficient Class-D Operation Eliminates Need for Heat Sinks
• Requires Only Two Power-Supply Rails
• Two Serial Audio Inputs (Four Audio Channels)
• Supports 32-kHz–192-kHz Sample Rates (LJ/RJ/I²S)
• Headphone PWM Outputs
• Subwoofer PWM Outputs

Audio/PWM Processing

• Independent Channel Volume Controls With 24-dB to –100-dB Range
• Soft Mute (50% Duty Cycle)
• Programmable Dynamic Range Control
• 16 Adaptable Biquads for Speaker EQ
  • Seven Biquads for Left and Right Channels
  • Two Biquads for Subwoofer Channel
• Adaptive Coefficients for DRC Filters
• Programmable Input and Output Mixers
• DC Blocking Filters
• Loudness Compensation for Subwoofer
• Automatic Sample Rate Detection and Coefficient Banking for DRC and EQ

General Features

• Serial Control Interface Operational Without MCLK
• Factory-Trimmed Internal Oscillator Enables Automatic Detection of Incoming Sample Rates
• Thermal and Short-Circuit Protection

Benefits

• EQ: Speaker Equalization Improves Audio Performance
• DRC: Dynamic Range Compression. Enables Power Limiting, Speaker Protection, Easy Listening, Night-Mode Listening
• Autobank Switching: Preload Coefficients for Different Sample Rates. No Need to Write Any Coefficients to the Part When Sample Rate Changes.
• Autodetect: Automatically Detects Sample-Rate Changes. No Need for External Microprocessor Intervention