WM8718 Datasheet, PDF (1/27 Pages) Wolfson Microelectronics plc – 24 BIT DIFFERENTIAL STEREO DAC WITH VOLUME CONTROL

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WM8718
24 Bit Differential Stereo DAC with Volume Control
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.
BLOCK DIAGRAM
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
- I²S, 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-pin SSOP Package
APPLICATIONS
• CD, DVD, and DVD-Audio Players
• Home theatre systems
• Professional mixing desks
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WM8718
CONTROL
INTERFACE
ZEROFR
ZEROFL
BCKIN
LRCIN
DIN
AUDIO
INTERFACE
ATT/
MUTE
ATT/
MUTE
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
DAC
DAC
VOUTRP
VOUTRN
VOUTLP
VOUTLN
VMID
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, March 2004, Rev 4.1
Copyright 2004 Wolfson Microelectronics plc