Multi-channel HDA Codec with S/PDIF Transceiver

The WM8850 is a high performance multi-channel audio code 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 utilizes advanced charge pump and DC servo technology to minimize 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 analog line-in and microphone input digitization. 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.

Features

  • 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 8 kHz - 192 kHz
  • ADC sampling frequency 8 kHz - 96 kHz
  • DAC Performance:
    • SNR 108 dB (‘A’ weighted)
    • SNR 105 dB (non weighted)
    • THD -96 dB (at 0 dBFS)
  • ADC Performance:
    • SNR 105 dB (‘A’ weighted)
    • SNR 102 dB (non weighted)
    • THD -95 dB (at -1 dBFS)
  • 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
    • Analog: 4.5V – 5.5V
    • Charge pump: 4.5V – 5.5V
  • 48-pin 7mm x 7mm QFN package

Parametric Specifications

DACs 6
ADCs 4
DAC Dynamic Range (dB) 108
ADC Dynamic Range (dB) 105
DAC THD+N (dB) -96
ADC THD+N (dB) -95
DAC Sample Rate (kHz) 8-192
ADC Sample Rate (kHz) 8-96
Analog Power Supply (V) 4.5-5.25
Supply Current (µA) 1.62-1.98
Bus Interface HD-Audio
Package 48 QFN

Technical Documents

WM8850 Product Datasheet

Jan 24, 2017, v4.0 : 3.2 Mb

WM8850 - WM8860 Product Flyer

Jan 1, 2011, n/a : 386 Kb

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