WM8728 Datasheet, PDF (1/28 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz Stereo DAC with Volume Control and DSD Support

WM8728
24-bit, 192kHz Stereo DAC
with Volume Control and DSD Support
DESCRIPTION
The WM8728 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8728 supports PCM data input word
lengths from 16 to 32-bits and sampling rates up to 192kHz.
Alternatively the WM8728 can operate in DSD compatible
mode where a 64x bitstream is input for each channel. The
WM8728 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and
stereo DAC in a small 20-pin SSOP package. The WM8728
also includes a digitally controllable mute and attenuate
function for each channel.
The WM8728 supports a variety of connection schemes for
audio DAC control. The 2 or 3-wire MPU serial port provides
access to a wide range of features including on-chip mute,
attenuation and phase reversal. A hardware controllable
interface is also available (DSD operation is only possible in
hardware mode).
The WM8728 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players supporting DVD-A.
BLOCK DIAGRAM
Product Preview, Rev 1.2, April 2001
FEATURES
• Stereo DAC with 24 bit PCM or single bit DSD operation
• Audio Performance
- 106dB SNR (‘A’ weighted @ 48kHz) DAC
- -97dB THD
• DAC Sampling Frequency: 8kHz - 192kHz
• 2 or 3-Wire Serial Control Interface or Hardware Control
• 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
• 3.0V - 5.5V Supply Operation
• 20-pin SSOP Package
• Exceeds Dolby Class A Performance Requirements
APPLICATIONS
• DVD-Audio and DVD ‘Universal’ Players
• Home theatre systems
• Digital TV
• Digital broadcast receivers
MODE LATI2S SCKDSD SDIDEM MUTEB CSBIWL ZERO
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
MUTE/
ATTEN
MUTE/
ATTEN
CONTROL INTERFACE
WM8728
PCM/DSD
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
VOUTR
VOUTL
VMID
MCLK
AVDD DVDD
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.wolfsonmicro.com
VREFP VREFN AGND DGND
Product Preview data sheets contain
specifications for products in the
formative phase of development. These
products may be changed or discontinued
without notice.
2001 Wolfson Microelectronics Ltd.