The highly integrated CS4265 stereo audio codec with S/PDIF output provides premium audio performance and an innovative design that integrates five chips into one. The CS4265 features an integrated analog front-end with 2:1 input mux. Also included is a programmable gain amplifier (PGA) capable of ±12 dB of analog gain in 0.5 dB step sizes with zero-crossing, click-free transitions to maintain superior audio quality. One pair of inputs has a dedicated microphone pre-amplifier in its path that provides 32 dB of gain, and a low-noise microphone bias supply is also available. The stereo analog-to-digital (A/D) and digital-to-analog (D/A) conversion is based on multibit Delta-Sigma architecture. Both the A/D converter and the D/A converter support 24-bit conversion and sample rates up to 192 kHz. High-quality single-ended inputs and outputs are also offered; the outputs feature Cirrus Logic’s patented Popguard technology, which eliminates power-cycling clicks and pops — as a result, the number of external components needed is reduced. The CS4265 operates from either a 3.3 V or 5 V power supply. It has 1.8 V to 5 V logic power supplies for the control and serial port, which allows a direct interface to external processors or microcontrollers without level shifting. A synchronous S/PDIF (IEC60958-3) digital audio transmitter is integrated to provide additional design flexibility and lower system cost. The CS4265 delivers professional quality at a break-through price point for applications such as DVD recorders and receivers, digital video recorders/personal video recorders, digital TVs, set-top boxes, home media centers, automotive entertainment systems, notebook computers and PC sound cards.