DESCRIPTION
A high-performance ground-referenced stereo headphone amplifier utilises advanced charge pump and DC servo technology to minimise system cost and space without compromise on audio quality. Line outputs provide a high-quality differential connection to speaker amplifiers, enabling common mode noise rejection when these traces are routed across a PCB. The WM8850 also has two high performance stereo ADCs to provide Hi-Fi quality analogue line-in and microphone input digitisation. A low noise microphone bias with programmable output voltage is provided. Additionally, the CODEC contains a digital microphone interface capable of supporting up to four independent digital microphones. One differential stereo input is provided for line level signals, while one pseudo-differential stereo input with integrated microphone preamplifier is provided. The WM8850 also contains a S/PDIF transceiver which is fully compatible with IEC-60958-3. The S/PDIF receive and transmit paths each contain a sample rate converter (SRC) to enable asynchronous sample rate conversion between the S/PDIF receive/transmit and HDA interface clock domains.
Wolfson Microelectronics
