WM8850
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Multi-Channel High Definition Audio CODEC
DESCRIPTION FEATURES
Multi-channel High Definition Audio CODEC
The WM8850 is a high performance multi-channel audio
Fully compatible with Intel High Definition Audio Revision 1.0
CODEC designed for high performance PC audio systems. The
6-Channel DAC, 4-channel ADC
device offers full compatibility with the Intel High Definition Audio
DAC sampling frequency 8kHz - 192kHz
(HDA) specification revision 1.0, allowing seamless integration
ADC sampling frequency 8kHz - 96kHz
with industry-standard HDA controllers.
DAC Performance:
The WM8850 has three high performance stereo DACs to
- SNR 108 dB (A weighted)
enable six channels of high definition audio, ideal for 5.1
- SNR 105dB (non weighted)
channel applications. A high-performance ground-referenced
- THD -96dB (at 0dBFS)
stereo headphone amplifier utilises advanced charge pump and
ADC Performance:
DC servo technology to minimise system cost and space without
- SNR 105 dB (A weighted)
compromise on audio quality. Line outputs provide a high-
- SNR 102dB (non weighted)
quality differential connection to speaker amplifiers, enabling
- THD -95dB (at -1dBFS)
common mode noise rejection when these traces are routed
Ground-referenced stereo headphone driver
across a PCB.
Differential line inputs/outputs
Stereo microphone interface with integrated pre-amp
The WM8850 also has two high performance stereo ADCs to
Multi-channel digital microphone interface
provide Hi-Fi quality analogue line-in and microphone input
IEC-60958-3 compatible S/PDIF transceiver
digitisation. A low noise microphone bias with programmable
Additional IEC-60958-3 compatible S/PDIF transmitter
output voltage is provided. Additionally, the CODEC contains a
Jack detect and load impedance sensing
digital microphone interface capable of supporting up to four
Beep generator
independent digital microphones. One differential stereo input is
GPIO functionality
provided for line level signals, while one pseudo-differential
IEEE-754 Single precision 32-bit floating point support
stereo input with integrated microphone preamplifier is provided.
Power supplies
The WM8850 also contains a S/PDIF transceiver which is fully
- Digital core: 1.62V 1.98V
compatible with IEC-60958-3. The S/PDIF receive and transmit
- Digital buffer: 2.97V 3.63V
paths each contain a sample rate converter (SRC) to enable
- Analogue: 4.5V 5.25V
asynchronous sample rate conversion between the S/PDIF - Charge pump: 4.5V 5.25V
receive/transmit and HDA interface clock domains. An 48-pin 7mm x 7mm QFN package
additional S/PDIF transmitter is provided to allow direct output of
APPLICATIONS
a stereo stream from the HDA interface.
The WM8850 is supplied in a small 48-pin QFN package. High performance PC audio
All-in-one desktop PC
Notebook PC
Pre Production, April 2011, Rev 3.2
WOLFSON MICROELECTRONICS plc
Copyright 2011 Wolfson Microelectronics plc
WM8850 Pre-Production
BLOCK DIAGRAM
PP, April 2011, Rev 3.2
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