WM8746 Datasheet, PDF (1/31 Pages) Wolfson Microelectronics plc – 24BIT 192KHZ 6 CHANNEL DAC WITH VOLUME CONTROL

WM8746
24-bit, 192kHz 6-Channel DAC with Volume Control
DESCRIPTION
WM8746 is a high performance 6-channel DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8746 supports data input word
lengths from 16 to 32-bits and sampling rates up to 192kHz.
The WM8746 can convert up to 6 channels at sample rates
from 8 to 192kHz. Additionally WM8746 supports 2
channels at 192kHz and 4 channels at 96kHz
simultaneously.
The WM8746 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and 6
DACs in a small 28-pin SSOP package. The WM8746 also
includes a digitally controllable mute and attenuator function
on each channel.
The WM8746 supports a variety of connection schemes for
audio DAC control. The serial control interface provides
access to a wide range of features including on-chip mute,
attenuation and phase reversal. A hardware controllable
interface is also available. It is pin-compatible with the
WM8736, (apart from RSTB pin which is typically unused).
The WM8746 is an ideal device to interface to AC-3ä,
DTSä, and MPEG audio decoders for surround sound
applications, or for use in “universal” high definition audio
players supporting DVD-A formats.
FEATURES
• 6-Channel DAC
• Audio Performance
− 106dB SNR (‘A’ weighted @ 48kHz) DAC
− -96dB THD
• DAC Sampling Frequency: 8kHz – 192kHz
• 3-Wire Serial Control Interface
• Programmable Audio Data Interface Modes
− I²S, Left, Right Justified or 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
• 28-Pin SSOP Package
• Exceeds Dolby Class A Performance Requirements
• Pin Compatible with WM8736
APPLICATIONS
• DVD and DVD ‘Universal’ Players
• Home theatre systems
• Digital broadcast receivers
BLOCK DIAGRAM
SCKI ML/I2S MC/IWL MD/DM
MODE MUTE
CONTROL
INTERFACE
WM8746
BCKIN
LRCIN
LRCIN2
AUDIO
INTERFACE
DIN0
DIN1
DIN2
DAC
CHANNEL
CONTROL
DVDD
DGND
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
L0A[7:0]
Digital
Filter
R0A[7:0]
L1A[7:0]
Digital
Filter
R1A[7:0]
L2A[7:0]
Digital
Filter
R2A[7:0]
Sigma
Delta
Modulator
Stereo
DAC
Sigma
Delta
Modulator
Stereo
DAC
Sigma
Delta
Modulator
Stereo
DAC
OUT0L
GR0
OUT0R
OUT1L
GR1
OUT1R
OUT2L
GR2
OUT2R
AGND1 AGND2 AVDD1 AVDD2 CAP
Advance Information November 2001, Rev 1.4
Copyright 2001 Wolfson Microelectronics Ltd.