WM9710 Datasheet, PDF (1/32 Pages) Wolfson Microelectronics plc – AC97 Audio CODEC and Mixer with Integrated Headphone Driver

WM9710
AC’97 Audio CODEC and Mixer with
Integrated Headphone Driver
DESCRIPTION
FEATURES
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, •
primary/secondary mode operation and S/PDIF or I²S output.
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 I²S 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
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
• Personal Digital Assistants and ‘Smartphones’
• WinCE systems
BLOCK DIAGRAM
DGND1 DVDD1
DGND2 DVDD2
CX3D1 CX3D2
W
WM9710
LINEINL
LINEINR
CDL
CDGND
CDR
MIC2
MIC1
VREFOUT
MIC SELECT
(Reg 20h) _M
U
M
X
MIC BOOST
(Reg 0Eh)
0/20
dB
U
X _{headset autodetect}
HPOUTL
PHONE
VREF
LINEINVOL (Reg 10h)
MICVOL (Reg 0Eh)
CDVOL (Reg 12h)
RECORD
GAIN
(Reg 1Ch)
M
U
X
RECORD
SELECT
(Reg 1Ah)
ADC
L
ADC
R
DIGITAL
FILTERS
Σ∆
MODULATION
VARIABLE
RATE AUDIO
DAC
L
DAC
R
POP
(Reg 20h)
DACVOL
(Reg 18h)
(Reg 0Ah)
CONTROL LOGIC
AC'97
INTERFACE
CLOCK
OSC
3D
MIXVOL
(Reg 72h)
ADCNDAC
(Reg 5Ch)
MUX
HPND
(Reg 5Ch) HPVOL
(Reg 04h)
M
U
X
16 / 32Ohm
headphone
HPOUTL
HPOUTR
HPGND
MASTER VOL
(Reg 02h)
LINEOUTL
LINEOUTR
PHIZ
(Reg 78h)
(Reg 0Ch)
M
U
X _PSEL
(Reg 5Ch)
MIX
(Reg 20h)
M
U
X
MONO VOL
(Reg 06h)
MONO_OUT
(TX)
24.576MHz
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, December 2003, Rev 4.0
Copyright 2003 Wolfson Microelectronics plc