Audio Codec 4ADC / 6DAC 48-Pin QFN Tube

The WM8850 is a high performance multi-channel audio CODEC designed for high performance PC audio systems. The device offers full compatibility with the Intel High Definition Audio (HDA) specification revision 1.0, allowing seamless integration with industry-standard HDA controllers. The WM8850 has three high performance stereo DACs to enable six channels of high definition audio, ideal for 5.1 channel applications. 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 highquality 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. An additional S/PDIF transmitter is provided to allow direct output of a stereo stream from the HDA interface. The WM8850 is supplied in a small 48-pin QFN package.

• Multi-channel High Definition Audio CODEC
• Fully compatible with Intel High Definition Audio Revision 1.0
• 6-Channel DAC, 4-channel ADC
• DAC sampling frequency 8kHz - 192kHz
• ADC sampling frequency 8kHz - 96kHz
• DAC Performance:
  • SNR 108 dB (‘A’ weighted)
  • SNR 105dB (non weighted)
  • THD -96dB (at 0dBFS)
• ADC Performance:
  • SNR 105 dB (‘A’ weighted)
  • SNR 102dB (non weighted)
  • THD -95dB (at -1dBFS)
• Ground-referenced stereo headphone driver
• Differential line inputs/outputs
• Stereo microphone interface with integrated pre-amp
• Multi-channel digital microphone interface
• IEC-60958-3 compatible S/PDIF transceiver
• Additional IEC-60958-3 compatible S/PDIF transmitter
• Jack detect and load impedance sensing
• Beep generator
• GPIO functionality
• IEEE-754 Single precision 32-bit floating point support
• Power supplies
  • Digital core: 1.62V – 1.98V
  • Digital buffer: 2.97V – 3.63V
  • Analogue: 4.5V – 5.25V
  • Charge pump: 4.5V – 5.25V
• 48-pin 7mm x 7mm QFN package