TAS5548 - 96KHz PWM Modulator with integrated ASRC and Audio Processor

The TAS5548 is an 8-channel Digital Pulse Width Modulator (PWM) with Digital Audio Processing and Sample Rate Converter that provides both advanced performance and a high level of system integration. TAS5548 is designed to support DTS-HD specification Blu-ray HTiB applications. The ASRC consists of two separate modules which handle 4 channels each. Therefore, it is possible to support up to two different input sampling rates.

Texas Instruments Power Stages are designed to work seamlessly with the TAS5548. The TAS5548 also provides a high-performance, differential output to drive an external, differential-input, analog headphone amplifier.

The TAS5548 supports AD, BD, and ternary modulation operating at a 384-kHz switching rate for 48-, 96-, and 192-kHz data. The external crystal used must be 12.288 MHz. The TAS5548 also features power-supply-volume-control (PSVC), which improves dynamic range at lower power level and can be used as part of a Class G power supply when used with closed-loop PWM input power stages.

• General Features
  • 8ch Asynchronous Sample Rate Converter
  • 8 Channel Audio Processing for 32-192 kHz
    (ARSC to 96kHz)
  • 4 Channel Native Audio Processing at 192kHZ
  • 30 kHz Audio Bandwidth for DTS-HD
    Compatibility
  • Energy Manager for Overall System Power
    Control
  • Power Supply Volume Control
• Audio Input or Output
  • Up to Five Synchronous Serial Audio Inputs
    (10 Channels)
  • Up to One Synchronous Serial Audio Outputs
    (2 Channels)
  • I2S Master Mode When Used With External
    Crystal
  • Slave Mode 32-192KHz With Auto/Manual
    Sample Rate Detection
  • Eight Differential PWM Output That can
    Support AD or BD Modulation
  • Two Differential PWM Headphone Outputs
  • I2S Out for External Wireless Sub
  • PWM Output Supports Single Ended (S.E.) or
    Bridge Tied Load (BTL)
• Audio Processing
  • Volume Control Range 18 dB to –127 dB
    (Master and Eight Channel Volume)
  • Bass and Treble Tone Controls With ±18-dB
    Range, Selectable Corner Frequencies
  • Configurable Loudness Compensation
  • Two Dynamic Range Compressors With Two
    Thresholds, Two Offsets, and Three Slopes
  • Seven Biquads Per Channel
• PWM Processing
  • >105-dB Dynamic Range
  • THD+N < 0.1% (0–40 kHz)
  • 20-Hz–40-kHz, Flat Noise Floor for 32KHz –
    192KHz
  • Flexible Automute Logic With Programmable
    Threshold and Duration for Noise-Free
    Operation
  • Power-Supply Volume Control (PSVC) in High-
    Performance Applications
  • Adjustable Modulation Limit