TAS5709

具有片上音频处理（软件控制）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. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital-audio processors and MPEG decoders. The device accepts a wide range of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers.

The TAS5709 is a slave-only device receiving all clocks from external sources. The TAS5709 operates with a PWM carrier between a 384-kHz switching rate and a 352-KHz switching rate, depending on the input sample rate. Oversampling combined with a fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

The TAS5709A is identical in function to the TAS5709, but has a unique I2C device address. The address of the TAS5709 is 0x36. The address of the TAS5709A is 0x3A.

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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 PVDD Range, From 8 V to 24 V

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Efficient Class-D Operation Eliminates Need for Heatsinks

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Requires Only 3.3 V and PVDD

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One Serial Audio Input Two Audio Channels

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Supports 8-kHz to 48-kHz Sample Rate LJ/RJ/I2S

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Audio/PWM Processing

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Independent Channel Volume Controls With 24 dB to Mute

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Soft Mute 50% Duty Cycle

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Programmable 2-Band Dynamic Range Control

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22 Programmable Biquads for Speaker EQ and Other Audio-Processing Features

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Programmable Coefficients for DRC Filters

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Programmable Input and Output Mixers

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DC Blocking Filters

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Support for 3D Effects

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Pseudo Bass Support

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General Features

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Serial Control Interface Operational Without MCLK

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Factory-Trimmed Internal Oscillator for Automatic Rate Detection

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Surface Mount, 48-Pin, 7-mm × 7-mm HTQFP Package

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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. Can Be Used As Power Limiter. Enables Speaker Protection, Easy Listening, Night-Mode Listening

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Two-Band DRC: Sets Two Different Thresholds for Low- and High-Frequency Content

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

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