w
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-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in “universal” high definition audio
players supporting DVD-A formats.
WM8746
24-bit, 192kHz 6-Channel DAC with Volume Control
FEATURES
•
•
6-Channel DAC
Audio Performance
−
106dB SNR (‘A’ weighted @ 48kHz) DAC
−
-95dB THD
DAC Sampling Frequency: 8kHz – 192kHz
3-Wire Serial Control Interface
Programmable Audio Data Interface Modes
−
•
•
•
•
•
I
2
S, 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
WM8746
CONTROL
INTERFACE
ATC
DEEMPH
BCP
PDWN
PL[3:0]
IWL[1:0]
MUTE
UPDATE
LxA[23:0]
LRP
RxA[23:0]
FMT[1:0]
PDWN
PDWN
PDWN
L0A[7:0]
Digital
Filter
Sigma
Delta
Modulator
Stereo
DAC
OUT0L
GR0
OUT0R
BCKIN
LRCIN
LRCIN2
R0A[7:0]
L1A[7:0]
AUDIO
INTERFACE
DAC
CHANNEL
CONTROL
R1A[7:0]
DIN0
DIN1
DIN2
L2A[7:0]
Digital
Filter
Sigma
Delta
Modulator
Stereo
DAC
OUT1L
GR1
OUT1R
Digital
Filter
Sigma
Delta
Modulator
Stereo
DAC
OUT2L
GR2
OUT2R
R2A[7:0]
DVDD
DGND
AGND1
AGND2
AVDD1
AVDD2
CAP
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up
at
Production Data, March 2006, Rev 4.0
Copyright
2006
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
