w
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-lead SSOP
package or 24-lead QFN 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
•
•
•
24 bit Stereo DAC
Fully Differential Voltage Outputs
Audio Performance
-
111dB SNR (‘A’ weighted @ 48kHz) DAC
-
-100dB THD
DAC Sampling Frequency: 8kHz - 192kHz
3 Wire Serial Control Interface
Programmable Audio Data Interface Modes
-
I
2
S, Left, Right Justified, DSP
-
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-lead SSOP Package or 24-lead QFN Package
•
•
•
•
•
•
•
APPLICATIONS
•
•
•
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
To receive regular email updates, sign up
at
http://www.wolfsonmicro.com/enews/
Production Data, November 2006, Rev 4.3
Copyright
©2006
Wolfson Microelectronics plc
VREFN
DGND
AGND
DVDD
AVDD