TAS5705

具有 EQ 和 DRC（s/w 控制）的 20W 立体声数字音频功率放大器

The 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.

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Audio Input/Output

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20-W Into an 8- Load From an 18-V Supply

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Wide Power-Supply Range From 8 V to 23 V

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Efficient Class-D Operation Eliminates Need for Heat Sinks

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Requires Only Two Power-Supply Rails

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Two Serial Audio Inputs Four Audio Channels

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Supports 32-kHz–192-kHz Sample Rates LJ/RJ/I2S

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Headphone PWM Outputs

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Subwoofer PWM Outputs

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Audio/PWM Processing

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Independent Channel Volume Controls With 24-dB to –100-dB Range

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Soft Mute 50% Duty Cycle

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Programmable Dynamic Range Control

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16 Adaptable Biquads for Speaker EQ

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Seven Biquads for Left and Right Channels

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Two Biquads for Subwoofer Channel

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Adaptive Coefficients for DRC Filters

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Programmable Input and Output Mixers

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DC Blocking Filters

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Loudness Compensation for Subwoofer

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Automatic Sample Rate Detection and Coefficient Banking for DRC and EQ

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General Features

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Serial Control Interface Operational Without MCLK

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Factory-Trimmed Internal Oscillator Enables Automatic Detection of Incoming Sample Rates

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Thermal and Short-Circuit Protection

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Benefits

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EQ: Speaker Equalization Improves Audio Performance

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DRC: Dynamic Range Compression. Enables Power Limiting, Speaker Protection, Easy Listening, Night-Mode Listening

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Autobank Switching: Preload Coefficients for Different Sample Rates. No Need to Write Any Coefficients to the Part When Sample Rate Changes.

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Autodetect: Automatically Detects Sample-Rate Changes. No Need for External Microprocessor Intervention

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