WM8722 Wolfson Microelectronics Ltd., WM8722 Datasheet
WM8722
Manufacturer Part Number
WM8722
Description
WM8722 : Stereo DAC With Tone Generator And Line / Variable Level Outputs
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet
1.WM8722.pdf
(24 pages)
DESCRIPTION
The WM8722 is a high performance stereo DAC designed
for audio applications such as digital TV and set top boxes.
The WM8722 has two stereo analogue outputs, one at line
level and one that includes a digitally controllable mute and
attenuator function. An on-chip tone generator can be
routed through the line or variable outputs.
WM8722 supports data input word lengths from 16-24 bits
and sampling rates up to 96kHz. The WM8722 consists of a
serial interface port, digital interpolation filter, multi-bit sigma
delta modulator and stereo DAC in a small 20-pin SSOP
package.
The 3 or 2-wire serial MPU compatible control port provides
access to all features including tone generation, on-chip
mute, attenuation and phase reversal.
The programmable data input port supports glueless
interfaces to popular DSPs, audio decoders and S/PDIF
and AES/EBU receivers.
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS LTD
w :: www.wolfsonmicro.com
Stereo DAC with Integrated Tone Generator and Line/Variable
LATCH
BCKIN
LRCIN
BUSY
TCLK
SCKI
DIN
MD
MC
GENERATOR
INTERFACE
INTERFACE
CONTROL
DVDD
SERIAL
TONE
DGND
AGND
ATTENUATOR
ATTENUATOR
FILTERS
FILTERS
DIGITAL
DIGITAL
TONE
DAC
AND
AND
4
MONO ATTENUATION CONTROL
CAP
0 TO -46.5dB, 1.5dB
Level Outputs
STEPS
BIT
BIT
MULTI
MULTI
AVDD
MXINL
MXINR
FEATURES
APPLICATIONS
MULTI
MULTI
DAC
DAC
BIT
SC
BIT
SC
Performance
3-wire or 2-wire serial MPU compatible interface for
On-chip tone generator (1Hz – 32kHz, 0.1 – 25.5s)
Stereo analogue inputs
20-pin SSOP package
Digital TV
Digital broadcast receivers
Set top boxes
+12 to -34.5dB, 1.5dB Steps
+12 TO -34.5dB, 1.5dB
STEPS
102dB SNR (‘A’ weighted @48kHz)
-95dB THD
5V or 3V supply operation
Sampling frequency: 8kHz – 96kHz
Input data word; 16/20/24-Bit
Soft mute
De-emphasis
Volume control
Copyright
Advanced Information, June 2001, Rev 2.1
L Mix Switches (0-9)
R Mix Switches (0-9)
2001 Wolfson Microelectronics Ltd.
WM8722
+
+
+
+
0/-6dB
0/-6dB
0/-6dB
0/-6dB
WM8722
+6 to -73dB,
1dB Steps
LINEOUTL
VAROUTL
VAROUTR
LINEOUTR
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