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-pin TQFP package or 48-pin QFN package.

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 x 7 x 0.9mm QFN.