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Mio336i PDA Maintenance
Mio336i PDA Maintenance
1.3.2.4 Audio Codec : WM9705 Multimedia AC’97 Codec with Integrated Touch
Screen Controller
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 ration. Optional AC’97 features include 3D
sound enhancement, line-level outputs, stereo buffered headphone outputs, hardware sample rate version, 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 7x7x0.9mm QFN.
AC’97 Rev 2.2 compliant codec with pen digitizer
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
Features
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