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Wolfson Microelectronics
Wolfson Microelectronics

WM8850 Datasheet

Multi Channel HDA CODEC


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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 – 5.5V
- Charge pump: 4.5V – 5.5V
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
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Product Brief, January 2011, Rev 3.0
Copyright ©2011 Wolfson Microelectronics plc
Page 1

WM8850
BLOCK DIAGRAM
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Product Brief, January 2011, Rev 3.0
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Product Brief
TABLE OF CONTENTS
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DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................2
TABLE OF CONTENTS .........................................................................................3
PIN CONFIGURATION...........................................................................................4
ORDERING INFORMATION ..................................................................................4
PIN DESCRIPTION ................................................................................................5
ABSOLUTE MAXIMUM RATINGS.........................................................................6
RECOMMENDED OPERATING CONDITIONS .....................................................6
ELECTRICAL CHARACTERISTICS ......................................................................7
INTRODUCTION ..................................................................................................19
APPLICATIONS INFORMATION .........................................................................20
RECOMMENDED EXTERNAL COMPONENTS........................................................... 20
REQUIRED JACK DETECT COMPONENTS............................................................... 21
PACKAGE DIMENSIONS ....................................................................................22
IMPORTANT NOTICE ..........................................................................................23
ADDRESS:................................................................................................................... 23
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Product Brief, January 2011, Rev 3.0
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Page 3
Part Number WM8850
Manufactur Wolfson Microelectronics
Description Multi Channel HDA CODEC
Total Page 23 Pages
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