WM9710
AC’97 Audio CODEC and Mixer with
Integrated Headphone Driver
DESCRIPTION
FEATURES
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•
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AC’97 rev2.2 compliant, 18-bit stereo codec
The WM9710 is a high-quality stereo audio codec with an
integrated headphone driver.
Integrated headphone driver
Automatic headset detection and switching (for stereo
headphones / mono phone headsets)
The device is compliant with the Intel AC’97 Rev 2.2
specification. It performs full-duplex 18-bit codec functions and
supports variable sample rates from 8kHz to 48kHz with high
signal to noise ratio. Analogue mixers are included to mix
external analogue signals into the playback or record path.
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Separately mixed mono output for phone TX path (also
includes headphone buffer for mono earpiece)
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Multiple channel input mixer
Mono inputs for phone RX and PCBEEP signals
The WM9710 allows designers to easily integrate phone
functions with other audio functions such as MP3 playback and
voice recording. Mono inputs and outputs are provided to
connect to an external voice codec. The on-chip headphone
driver can distinguish between a stereo headphone and mono
headset, and route the signals accordingly.
On-chip sample rate conversion, supports rates from 8kHz
to 48kHz. DAC and ADC rates are fully independent.
Optional S/PDIF or I2S digital audio output
3V to 5V operation
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Each circuit block can be separately powered on or off
Optional AC’97 features include 3D sound enhancement,
primary/secondary mode operation and S/PDIF or I2S output.
Leadless 7mm × 7mm × 0.9mm QFN or 48-pin TQFP
package
The 5-pin bi-directional AC-Link interface transfers control data,
DAC and ADC words to and from the AC’97 controller. The
WM9710 is fully operable on 3V or 5V or mixed 3/5V supplies,
and is packaged in a leadless, chip scale QFN package with
7mm body size or 48-pin TQFP package.
APPLICATIONS
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Personal Digital Assistants and ‘Smartphones’
WinCE systems
BLOCK DIAGRAM
DGND1
DVDD1
DGND2
DVDD2
CX3D1 CX3D2
W
WM9710
ADCNDAC
(Reg 5Ch)
MUX
16 / 32Ohm
headphone
HPND
(Reg 5Ch)
LINEINVOL (Reg 10h)
HPVOL
(Reg 04h)
CDVOL (Reg 12h)
M
U
X
HPOUTL
HPOUTR
HPGND
MICVOL (Reg 0Eh)
3D
MIXVOL
(Reg 72h)
POP
RECORD
GAIN
(Reg 1Ch)
DIGITAL
FILTERS
ADC
L
DAC
L
(Reg 20h)
LINEINL
LINEINR
CDL
MASTER VOL
(Reg 02h)
M
U
X
Σ∆
LINEOUTL
MODULATION
CDGND
CDR
MIC2
LINEOUTR
DACVOL
(Reg 18h)
MIC BOOST
(Reg 0Eh)
ADC
R
DAC
R
MIC SELECT
(Reg 20h)
VARIABLE
RATE AUDIO
PHONE
RECORD
SELECT
(Reg 1Ah)
M
U
X
0/20
dB
MIX
M
U
X
MIC1
(Reg 20h)
M
U
X
headset autodetect
HPOUTL
(Reg 0Ah)
(Reg 0Ch)
MONO_OUT
(TX)
M
U
X
MONO VOL
(Reg 06h)
PSEL
(Reg 5Ch)
VREF
VREFOUT
AC'97
INTERFACE
CLOCK
OSC
CONTROL LOGIC
PHIZ
(Reg 78h)
24.576MHz
WOLFSON MICROELECTRONICS plc
Production Data, December 2003, Rev 4.0
Copyright 2003 Wolfson Microelectronics plc
www.wolfsonmicro.com