WM9701A
Low Power AC’97 Multimedia Audio Codec
Production Data, January 2001, Rev 3.2
DESCRIPTION
The WM9701A is a high-quality stereo audio codec compliant
with the Intel AC’97 Rev 1.03 specification. Forming the
analogue component PC audio solution, it performs full-duplex
18-bit codec functions at 48 ksamples/s and offers excellent
audio quality with high SNR.
In addition, the WM9701A provides a comprehensive analogue
mixer with 4 sets of stereo inputs, plus phone, 2 microphone,
and PC-beep inputs. On-chip reference circuits generate the
necessary bias voltages for the device, and a 5-pin digital bi-
directional serial interface allows transfer of control data and
DAC and ADC words to and from the AC’97 controller.
The WM9701A is particularly suited to low power applications
such as notebook PCs.
FEATURES
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3.3V or 5V operation
18-bit stereo codec
S/N ratio > 95dB
Multiple stereo input mixer
Mono and stereo volume control
48-pin TQFP package
Power management features
Very low standby power
APPLICATIONS
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Notebook PC
PC sound cards
Motherboards
BLOCK DIAGRAM
VOL/
MUTE
VOL/
MUTE
Σ
VOL/
MUTE
(35,36) LINEOUT
Σ
KEY:
MONO
STEREO
VOL/
MUTE
MUX
VOL/
MUTE
(37) MONOOUT
STEREO
DAC
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
(6) BITCLK
Σ
Σ
WM9701A
(10) SYNC
SERIAL
I/F
(8) SDATAIN
(5) SDATAOUT
(11) RESETB
CD (18,20)
LINEIN (23,24)
VIDEO (16,17)
AUX (14,15)
PHONE (13)
PCBEEP (12)
MIC[1] (21)
MUX
MIC[2] (22)
VOL
RECORD
MUX
AND
MUTE
0dB/
20dB
STEREO
ADC
OSC
(2) XTLIN
(3) XTLOUT
WOLFSON MICROELECTRONICS LTD.
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
http://www.wolfson.co.uk
Production Data
datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2001 Wolfson Microelectronics Ltd
.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
