WM9709 Datasheet, PDF (1/18 Pages) Wolfson Microelectronics plc – AC LINK INTERFACE AUDIO DAC

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WM9709
AC-link Interface Audio DAC
DESCRIPTION
The WM9709 is a low cost, high-quality stereo audio DAC.
It utilises the Intel specified AC-link audio interface protocol,
allowing a pair of audio output channels to be added to any
AC link compliant controller device at minimal board area
and external component cost.
The WM9709 device supports 48ks/s sample rates when
operated at the normal AC link rate. The WM9709 supports
a revision 1.03 AC ’97 AC-link interface, the device acting
as a master in normal operation.
The ID pin can be used to select which data slots on the
AC-link are to be used as input to the DAC. This allows 3 x
WM9709 to be used with a single controller that supports 6
channel sound, to output surround sound audio signals.
When supporting surround, centre or LFE channels, the
WM9709 behaves as a slave device.
The WM9709 device is footprint compatible with the
WM9708 codec, allowing simple swapping between DAC
and full codec features on the same board. The WM9709 is
packaged in a 20-pin SSOP.
BLOCK DIAGRAM
FEATURES
• 20-Bit Stereo DAC
• Audio Performance
− 102dB SNR (‘A’ weighted at 48kHz)
− -95dB THD
• Revision 1.03 or higher AC’97 AC-link interface support.
• 3.3V or mixed 3V digital, 5V analogue operation
• 20-Pin SSOP Package
• Minimal external component cost
• Support for surround and centre/LFE channels
APPLICATIONS
• Notebook PC
• PC sound cards
• Motherboards
• Custom sound applications
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WM9709
ID
RESETB
SDATAOUT
SDATAIN
BITCLK
SYNC
SERIAL
INTERFACE
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
RIGHT
DAC
LEFT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
LINEOUTR
LINEOUTL
CAP
XTLIN XTLOUT
DVDD DGND
AVDD AGND AGND
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
Production Data, February 2003, Rev 1.3
Copyright 2003 Wolfson Microelectronics plc