Cirrus Logic, Inc. A/D Converter for Class-D Real-Time PSR Feedback CS4461

The CS4461 is a complete analog/digital converter (ADC) for Class-D PSR (power-supply rejection) feedback. It performs sampling and A/D conversion, generating digital data for input to a Class-D modulator. The CS4461’s advanced Delta-Sigma architecture allows differential analog inputs that provide excellent noise rejection and multibit conversion at up to 7.5 MHz. This A/D converter provides real-time feedback of power-supply conditions to a Class-D modulator via a direct interface, resulting in very low signal delay. Improved PSR feedback allows the systems designer to use lower cost power supplies, resulting in a lower bill-of-materials (BOM) cost. Systems developers can further lower BOM costs by developing single-ended (half-bridge) solutions as opposed to differential (full-bridge) solutions. The CS4461 A/D converter and the CS44600/800 Class-D digital amplifiers provide a simple, small and cost-effective solution for DVD receivers, home theater recorders and entry-level audio/video receivers and home-theater-in-a-bo x systems. Features Advanced multibit Delta-Sigma architecture Real-time feedback of power-supply conditions Filterless digital output resulting in very low signal delay 135 mW power consumption Support for logic levels between 3.3 V and 5 V Differential analog architecture Modulator overflow detection Direct interface to CS44600/800 Class-D PWM modulator Multibit conversion at up to 7.5 MHz Delivery of modulated data over 2-wire interface Package information: 24-pin TSSOP; lead-free assembly