WM8722_01 Datasheet, PDF (1/24 Pages) Wolfson Microelectronics plc – Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs

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WM8722
Stereo DAC with Integrated Tone Generator and Line/Variable
Level Outputs
DESCRIPTION
FEATURES
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.
• Performance
− 102dB SNR (‘A’ weighted @48kHz)
− -95dB THD
− 5V or 3V supply operation
− Sampling frequency: 8kHz – 96kHz
• 3-wire or 2-wire serial MPU compatible interface for
− Input data word; 16/20/24-Bit
− Soft mute
− De-emphasis
− Volume control
• On-chip tone generator (1Hz – 32kHz, 0.1 – 25.5s)
• Stereo analogue inputs
• 20-pin SSOP package
The programmable data input port supports glueless
interfaces to popular DSPs, audio decoders and S/PDIF
and AES/EBU receivers.
APPLICATIONS
• Digital TV
• Digital broadcast receivers
• Set top boxes
BLOCK DIAGRAM
MXINL
+12 to -34.5dB, 1.5dB Steps
DIN
BCKIN
LRCIN
SCKI
4 MONO ATTENUATION CONTROL
SERIAL
INTERFACE
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
MD
MC
LATCH
BUSY
CONTROL
INTERFACE
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
+
0/-6dB
LINEOUTL
+
0/-6dB
VAROUTL
L Mix Switches (0-9)
R Mix Switches (0-9)
+6 to -73dB,
1dB Steps
+
0/-6dB
VAROUTR
+
0/-6dB
LINEOUTR
TCLK
TONE
GENERATOR
TONE
DAC
0 TO -46.5dB, 1.5dB
STEPS
DVDD DGND AGND
CAP
WOLFSON MICROELECTRONICS LTD
AVDD MXINR
w :: www.wolfsonmicro.com
+12 TO -34.5dB, 1.5dB
STEPS
WM8722
Advanced Information, June 2001, Rev 2.1
Copyright 2001 Wolfson Microelectronics Ltd.