WM9705_06 Datasheet, PDF (1/55 Pages) Wolfson Microelectronics plc – Multimedia AC’97 CODEC with Integrated Touch Screen Controller

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WM9705
Multimedia AC’97 CODEC with
Integrated Touch Screen Controller
DESCRIPTION
FEATURES
The WM9705 is a high-quality stereo audio codec with an
integrated touch screen controller.
The audio section 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 8 to 48k samples/s with
high signal to noise ratio. Optional AC’97 features include 3D
sound enhancement, line-level outputs, stereo buffered
headphone outputs, hardware sample rate conversion,
primary/secondary mode operation and S/PDIF output.
Headphone auto-detect, I²S output and headphone buffer on the
mono output are included.
Additionally, the WM9705 integrates a complete 4-wire touch
screen controller, including on-chip screen drivers, pen-down
detection feature, and pressure measurement capability.
A 5-pin digital bi-directional AC-Link serial interface allows
transfer of control data and DAC and ADC words to and from
the AC’97 controller. The WM9705 is fully operable on 3V or 5V
or mixed 3/5V supplies, and is packaged in the industry
standard 48-pin TQFP package with 7mm body size, or in a
smaller 7 × 7 × 0.9mm QFN.
• AC’97 rev2.2 compliant codec with pen digitiser
• 18-bit stereo audio codecs
• On-chip sample rate conversion
• Multiple channel input mixer
• S/PDIF digital audio output
• Headphone drivers on AUX and MONO outputs
• 4-wire touch screen interface with co-ordinate and
pressure measurement, and pen-down detection
• Wake-up from sleep mode on pen down
• 3V to 5V operation
• Extensive power management features including hardware
power down option
• Standard AC’97 pinout in 48-lead TQFP package or
48-lead QFN package.
APPLICATIONS
• Personal Digital Assistants and ‘Smartphones’
• PocketPC systems
BLOCK DIAGRAM
DGND1 DVDD1
DGND2 DVDD2
CX3D1 CX3D2
HPGND HPVDD
LINEINL
LINEINR
CDL
CDGND
CDR
MIC2
MIC1
AUXADC
BMON
LINEINVOL (Reg 10h)
MICVOL (Reg 0Eh)
CDVOL (Reg 12h)
MIC SELECT
(Reg 20h) _M
U
M
X
MIC BOOST
(Reg 0Eh)
0/20
dB
U
X _{headset autodetect}
HPOUTL
PHONE
VID
AUX
RECORD
GAIN
(Reg 1Ch)
M
U
X
RECORD
SELECT
(Reg 1Ah)
PCBEEP
PHONE
SAR
ADCSEL ^ADC
TOUCH PANEL
SWITCH MATRIX
PEN DOWN
ADC
L
ADC
R
CONTROL LOGIC
VID
AUX
DIGITAL
FILTERS
Σ∆
MODULATION
VARIABLE
RATE AUDIO
AC'97
INTERFACE
DAC
L
VID
AUX
DAC
R
DACVOL
(Reg 18h)
POP
(Reg 20h)
W
WM9705
(Reg 0Ah)
CLOCK
OSC
3D
MIXVOL
(Reg 72h)
MUX
ADCNDAC
(Reg 5Ch)
HPVOL
(Reg 04h)
M
U
X
HPND
(Reg 5Ch)
16 / 32Ohm
headphone
HPOUTL
HPOUTR
HPGND
(Reg 0Ch)
M
U
X _PSEL
(Reg 5Ch)
MASTER VOL
(Reg 02h)
MIX
(Reg 20h)
M
U
X
MONO VOL
(Reg 06h)
LINEOUTL
LINEOUTR
MONO_OUT
(TX)
VREF
VREFOUT
4-wire resistive
touchpanel
24.576MHz
WOLFSON MICROELECTRONICS plc
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Production Data, August 2006, Rev 4.4
Copyright ©2006 Wolfson Microelectronics plc