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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