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DESCRIPTION
The WM8718 is a high performance differential stereo DAC
designed for audio applications such as DVD, home theatre
systems and digital TV. The WM8718 supports PCM data
input word lengths from 16 to 32-bits and sampling rates up
to 192kHz. The WM8718 consists of a serial interface port,
digital interpolation filters, multi-bit sigma delta modulators
and differential stereo DAC in a small 20-pin SSOP
package. The WM8718 includes a digitally controllable
mute, an attenuate function and zero flag output for each
channel.
The 3-wire serial control port provides access to a wide
range of features including on-chip mute, attenuation and
phase reversal.
The WM8718 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players including those
supporting DVD-A.
WM8718
24 Bit Differential Stereo DAC with Volume Control
FEATURES
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24 bit Stereo DAC
Fully Differential Voltage Outputs
Audio Performance
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111dB SNR (‘A’ weighted @ 48kHz) DAC
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-100dB THD
DAC Sampling Frequency: 8kHz - 192kHz
3 Wire Serial Control Interface
Programmable Audio Data Interface Modes
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I
2
S, Left, Right Justified, DSP
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16/20/24/32 bit Word Lengths
Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps
Independent Zero Flag Outputs
3.0V - 5.5V Supply Operation
20-pin SSOP Package
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APPLICATIONS
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CD, DVD, and DVD-Audio Players
Home theatre systems
Professional mixing desks
BLOCK DIAGRAM
LATCH
SDIN
SCLK
W
WM8718
CONTROL
INTERFACE
ZEROFR
ZEROFL
BCKIN
LRCIN
DIN
AUDIO
INTERFACE
ATT/
MUTE
DIGITAL
FILTERS
ATT/
MUTE
SIGMA
DELTA
MODULATOR
VOUTRP
DAC
VOUTRN
VOUTLP
DAC
VOUTLN
SIGMA
DELTA
MODULATOR
VMID
MCLK
VREFP
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Copyright
2004
Wolfson Microelectronics plc
VREFN
DVDD
DGND
AVDD
AGND
Production Data, March 2004, Rev 4.1
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
