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www.wolfsonmicro.com
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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
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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
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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.
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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
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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 16Ω 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: 30µW
> 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 :: –10°C to +70°C
PF8731F-01/2001
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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
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