WM8722 Datasheet, PDF (1/23 Pages) Wolfson Microelectronics plc – Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs

WM8722
Stereo DAC with Integrated Tone Generator and
Line/Variable Level Outputs
Advanced Information, May 2000, Rev 1.5
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-board 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.
FEATURES
• Performance
− 102dB SNR (‘A’ weighted @48kHz)
− THD+N: -90dB @ F.S.
− 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-board tone generator (1Hz – 32kHz, 0.1 – 25.5s)
• Stereo analogue inputs
• 20-pin SSOP package
APPLICATIONS
• Digital TV
• Digital broadcast receivers
• Set top boxes
BLOCK DIAGRAM
DIN (17)
BCKIN (19)
LRCIN (18)
SCKI (20)
I2S/SDIF
16,18, 20
OR 24 BITS
MD (3)
MC (2)
LATCH (4)
BUSY (5)
SERIAL
INPUT
INTERFACE
MXINL(14)
+12 to -34.5dB, 1.5dB Steps
4 ^{MONO ATTENUATION CONTROL}
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
DIGITAL
ATTENUATOR
AND
FILTERS
MULTI
BIT ∑∆
MULTI
BIT
SC
DAC
+
0/-6dB
(13)LINEOUTL
+
0/-6dB
(12) VAROUTL
L Mix Switches (0-9)
R Mix Switches (0-9)
+6 to -73dB,
1dB Steps
+
0/-6dB
(9) VAROUTR
+
0/-6dB
(8) LINEOUTR
TCLK (1)
TONE
GENERATOR
TONE
DAC
0 TO -46.5dB, 1.5dB
STEPS
(16) (6)
(10)
DVDD DGND AGND
(15)
CAP
(11) (7)
AVDD MXINR
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.wolfson.co.uk
+12 TO -34.5dB, 1.5dB
STEPS
WM8722
Advanced Information data sheets contain
preliminary data on new products in the
preproduction phase of development.
Supplementary data will be published at a
later date.
2000 Wolfson Microelectronics Ltd.