DESCRIPTION

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.

FEATURES

? 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.