The TAS5708 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.
FEATURES
• Audio Input/Output
– 20-W Into an 8-Ω Load From an 18-V Supply
– Wide PVCC Range (10 V to 26 V); 3.3 V Digital Supply
– Supports One Serial Audio Input (8 kHz - 48kHz Sample Rates) (LJ/RJ/I2S)
– Power-Stage Feedback Allows Operation From Poorly Regulated Power Supplies
• Audio/PWM Processing
– Factory-Trimmed Internal Oscillator for Automatic Rate Detection
