WM9710
AC’97 Audio CODEC and Mixer with
Integrated Headphone Driver
DESCRIPTION
The WM9710 is a high-quality stereo audio codec with an
integrated headphone driver.
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.
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.
Optional AC’97 features include 3D sound enhancement,
2
primary/secondary mode operation and S/PDIF or I S output.
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.
FEATURES
•
•
•
•
•
•
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AC’97 rev2.2 compliant, 18-bit stereo codec
Integrated headphone driver
Automatic headset detection and switching (for stereo
headphones / mono phone headsets)
Separately mixed mono output for phone TX path (also
includes headphone buffer for mono earpiece)
Multiple channel input mixer
Mono inputs for phone RX and PCBEEP signals
On-chip sample rate conversion, supports rates from 8kHz
to 48kHz. DAC and ADC rates are fully independent.
Optional S/PDIF or I
2
S digital audio output
3V to 5V operation
Each circuit block can be separately powered on or off
Leadless 7mm
×
7mm
×
0.9mm QFN or 48-pin TQFP
package
APPLICATIONS
•
•
Personal Digital Assistants and ‘Smartphones’
WinCE systems
BLOCK DIAGRAM
DGND1
DVDD1
DGND2
DVDD2
CX3D1 CX3D2
W
WM9710
LINEINVOL (Reg 10h)
CDVOL (Reg 12h)
MICVOL (Reg 0Eh)
ADCNDAC
(Reg 5Ch)
MUX
HPND
(Reg 5Ch)
M
U
X
MIXVOL
(Reg 72h)
MPM
(Reg 5Ah)
HPVOL
(Reg 04h)
16 / 32Ohm
headphone
HPOUTL
HPOUTR
HPGND
3D
LINEINL
LINEINR
CDL
CDGND
CDR
MIC2
MIC1
M
U
X
MIC SELECT
(Reg 20h) M
0/20
U
dB
X
M
U
X headset autodetect
HPOUTL
MIC BOOST
(Reg 0Eh)
PHONE
RECORD
GAIN
(Reg 1Ch)
ADC
L
DIGITAL
FILTERS
Σ∆
MODULATION
DAC
L
POP
(Reg 20h)
MASTER VOL
(Reg 02h)
RECORD
SELECT
(Reg 1Ah)
ADC
R
VARIABLE
RATE AUDIO
DAC
R
DACVOL
(Reg 18h)
MIX
(Reg 20h)
(Reg 0Ah)
(Reg 0Ch)
M
U
X
M
U
X
MONO VOL
(Reg 06h)
PSEL
(Reg 5Ch)
LINEOUTL
LINEOUTR
MONO_OUT
(TX)
VREFOUT
VREF
CONTROL LOGIC
AC'97
INTERFACE
CLOCK
OSC
PHIZ
(Reg 78h)
XTLOUT
HSDET
EAPD
PWRUP/LRC
SPEN/I2S
SPDIF
CID0
VREF
XTLIN
PCBEEP
BITCLK
SYNC
SDATAIN
SDATAOUT
RESETB
24.576MHz
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, December 2003, Rev 4.0
Copyright
2003
Wolfson Microelectronics plc
PHONE
(RX)
AGND
AVDD
CAP2
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
