WM8850 View Datasheet(PDF) - Wolfson Microelectronics plc

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Description

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WM8850

Multi-Channel High Definition Audio CODEC

Wolfson Microelectronics plc 

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WM8850

Multi-Channel High Definition Audio CODEC

DESCRIPTION

FEATURES

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 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. An

additional S/PDIF transmitter is provided to allow direct output of

a stereo stream from the HDA interface.

 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

APPLICATIONS

The WM8850 is supplied in a small 48-pin QFN package.

 High performance PC audio

 All-in-one desktop PC

 Notebook PC

WOLFSON MICROELECTRONICS plc

Pre Production, April 2011, Rev 3.2

Copyright 2011 Wolfson Microelectronics plc

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