www.wolfsonmicro.com
------------------------------------------------------------------------------------
wolfson microelectronics : : leading world experts in the design of signal processing electronics_
Wolfson's new family of audio ICs for portable applications offers highly integrated, DSP
independent solutions that deliver CD quality sound at very low power consumption. The family
includes a full audio codec, WM8731, and two DACs, WM8711 and WM8721. All three devices
incorporate a powerful headphone amplifier whose output volume can be digitally controlled.
Each IC is available as a standard or low voltage part, operating at supply voltages down to
1.42V (digital) and 1.8V (analogue).
Using a unique USB clocking scheme, these ICs can generate 44.1kHz, 48kHz, 96kHz and other
commonly used sample rates directly from a 12 or 24MHz clock, eliminating the need for a PLL
in applications such as MP3 players. The WM8711 and WM8731 are pin-compatible and feature
an on-chip clock oscillator to supply the system clock.
Wolfson's portable audio ICs have a very flexible audio interface which can interface to any
industry standard DSP or other digital audio chip, thereby providing designers with a higher
degree of flexibility.
device
WM8721
WM8721L
WM8711
WM8711L
WM8731
WM8731L
device type
dac
dac (low voltage)
dac
dac (low voltage)
codec
codec (low voltage)
digital supply voltage
1.42V 3.6V
1.42V 3.6V
1.42V 3.6V
1.42V 3.6V
1.42V 3.6V
1.42V 3.6V
analogue supply voltage
2.7V 3.6V
1.8V 3.6V
2.7V 3.6V
1.8V 3.6V
2.7V 3.6V
1.8V 3.6V
analogue line-in
no
no
yes
yes
yes
yes
microphone input
no
no
no
no
yes
yes
on-chip clock generator
no
no
yes
yes
yes
yes
package
20-pin SSOP
20-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
28-pin SSOP
-----------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------
AUDIO DACs AND CODECS
FOR BATTERY-POWERED APPLICATIONS
productbenefits
portable digital audio solutions
WM8711 WM8721 WM8731
long battery life
cd sound quality
powerful headphone
amplifier
highly integrated solution
dsp independent
mobile
phones
with mp3
palm tops /
web browsers
mp3
players /
recorders
digital camcorders
www.wolfsonmicro.com
wolfson microelectronics : : direct sales offices
WORLD Headquarters
Wolfson Microelectronics Ltd
Bernard Terrace
Edinburgh
EH8 9NX UK
Tel: +44 131 667 9386
Fax: +44 131 667 5176
USA Sales Office
Wolfson Microelectronics Ltd
111 North Market Street
Suite 670 San Jose
CA 95113 USA
Tel: +1 408 279 2882
Fax: +1 250 746 4186
ASIA PACIFIC Sales Office
Wolfson Microelectronics Ltd
9F-1 No 6 Lane 180
Min-Chiuan East Road
Sec 6 Taipei Taiwan RoC
Tel: +886 2 2792 5775
Fax: +886 2 8791 8590
Copyright 2001, Wolfson Microelectronics Ltd. Wolfson and
are registered trademarks of Wolfson Microelectronics Ltd. All other trademarked names are the property of their respective owners.
------------------------------------------------------------------------
productfeatures
part number
voltage supply
standard
package
pack quantity
WM8711EDS
standard
47
SSOP-28
WM8711LEDS
low
47
SSOP-28
WM8721EDS
standard
66
SSOP-20
WM8721LEDS
low
66
SSOP-20
WM8731EDS
standard
47
SSOP-28
WM8731LEDS
low
47
SSOP-28
------------------------------------------------------------------------
orderinginformation
> cd quality audio performance
dac 100dB snr, 88dB thd (`A' weighted @ 48kHz)
adc 97dB snr, 85dB thd (WM8731 only)
> independent stereo line and headphone outputs
headphone output power: 40mW on 16
load
volume and mute controls
> low supply voltage
1.42 3.6V digital supply
1.8 3.6V analogue supply for low-voltage parts
2.7 3.6V analogue supply for standard parts
> very low power
playback only: 9mW @ 1.8V, 18mW @ 3.3V
simultaneous playback & record: 18mW @ 1.8V, 36mW @ 3.3V
standby: 30W
> programmable sample rates :: 8, 32, 44.1, 48, 88.2, 96kHz
> on-chip clock generator (WM8711 and WM8731 only)
> programmable audio data interface
i
2
s, left/right justified or dsp modes
16/20/24/32-bit word lengths
master or slave clocking mode
> 2 or 3-wire serial control interface
> temperature range :: 10C to +70C
PF8731F-01/2001
------------------------------------------------------------------------------------
portable digital audio solutions
WM8711 WM8721 WM8731
productapplications
>
mp3 players and recorders
>
mobile information devices
>
palmtops
>
web browsers
>
mobile phones with mp3
>
digital camcorders and cameras
>
usb headsets
>> all battery powered systems incorporating digital audio
mobile
information
devices
usb headsets
digital still cameras
PDF 
ZIP