TAS5708

具有片上 DRC 和扬声器均衡的 20W 立体声闭环 12S 输入音频功率放大器

The is a 20-W, efficient, digital audio power amplifier for driving stereo bridge-tied speakers. A 32-bit datapath eliminates the need for pre-scaling before processing and preserves signal integrity without sacrificing dynamic range. A digital audio processor with fully programmable digital filters allows designers to custom tune speakers for optimum sound in small enclosures. A programmable DRC can adjust power levels for a scaleable design while also enabling night-mode listening modes.

The closed-loop architecture allows the device to operate from poorly regulated supplies. Figure 1 below shows the benefit of the feedback architecture when a noisy supply 1kHz, 500mVpp ripple modulates a 10kHz audio input. The figure shows a 40dB improvement in sideband suppression when compared to an open-loop design. This correlates directly to a 24dB improvement in distortion as seen in Figure 2.

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Audio Input/Output

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

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Wide PVCC Range 10 V to 26 V; 3.3 V Digital Supply

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Supports One Serial Audio Input 8 kHz - 48 kHz Sample Rates LJ/RJ/I2S

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Power-Stage Feedback Allows Operation From Poorly Regulated Power Supplies

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Audio/PWM Processing

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Factory-Trimmed Internal Oscillator for Automatic Rate Detection

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High-End 32-Bit Data Path Audio Processor

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14 Biquads for Speaker EQ

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Dynamic Range Control DRC

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Benefits

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EQ: Speaker Equalization Improves Audio Performance

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DRC: Enables Speaker Protection and Night-Mode Listening.

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Autobank Switching: Preloaded Coefficients for Three Different Sample Rates Eliminates the Need to Update Coefficients When Sample Rate Changes

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Autodetect: Automatically Detects Sample-Rate Changes Eliminating the Need for External Microprocessor Intervention

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Closed-Loop Power Stage: Enables Wide PVCC Operating Range and Reduced Power Supply Ripple Distortion