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WM9705 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM9705 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 55 page  w WM9705 Multimedia AC’97 CODEC with Integrated Touch Screen Controller WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, August 2006, Rev 4.4 Copyright ©2006 Wolfson Microelectronics plc 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, I 2S 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. 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. APPLICATIONS • Personal Digital Assistants and ‘Smartphones’ • PocketPC systems BLOCK DIAGRAM W WM9705 DVDD1 DGND1 DAC L HPGND HPVDD HPGND DAC R DIGITAL FILTERS Σ∆ MODULATION VARIABLE RATE AUDIO PEN DOWN AUXADC TOUCH PANEL SWITCH MATRIX 4-wire resistive touchpanel 16 / 32Ohm headphone ADCSEL CLOCK OSC HPOUTL HPOUTR VREFOUT DACVOL (Reg 18h) HPVOL (Reg 04h) LINEINVOL (Reg 10h) MICVOL (Reg 0Eh) RECORD GAIN (Reg 1Ch) VREF RECORD SELECT (Reg 1Ah) LINEOUTL LINEOUTR MASTER VOL (Reg 02h) AUX VID CONTROL LOGIC SAR ADC AC'97 INTERFACE 0/20 dB MIC BOOST (Reg 0Eh) M U X VID AUX MIC2 MIC1 M U X M U X HPOUTL headset autodetect CDR CDL LINEINR LINEINL CDGND MIC SELECT (Reg 20h) ADC R ADC L VID AUX PCBEEP POP (Reg 20h) MIXVOL (Reg 72h) CX3D1 CX3D2 M U X HPND (Reg 5Ch) MONO VOL (Reg 06h) MONO_OUT (TX) M U X M U X MIX (Reg 20h) PSEL (Reg 5Ch) 3D PHONE PHONE (Reg 0Ah) (Reg 0Ch) MUX ADCNDAC (Reg 5Ch) CDVOL (Reg 12h) DVDD2 DGND2 BMON 24.576MHz |
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