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WM9711 Datasheet(PDF) 12 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 12 Page - Wolfson Microelectronics plc |
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12 / 66 page  WM9711L Production Data w PD Rev 4.1 April 2004 12 DEVICE DESCRIPTION INTRODUCTION The WM9711L is designed to meet the mixed-signal requirements of portable and wireless computer systems. It includes audio recording and playback, analogue comparators for battery alarms, and GPIO functions, all controlled through a single 5-wire AC-Link interface. SOFTWARE SUPPORT The basic audio features of the WM9711L are software compatible with standard AC’97 device drivers. However, to better support its unique and additional functions, Wolfson Microelectronics supplies custom device drivers for selected CPUs and operating systems. Please contact your local Wolfson Sales Office for more information. AC’97 COMPATIBILITY The WM9711L uses an AC’97 interface to communicate with a microprocessor or controller. The audio and GPIO functions are largely compliant with AC’97 Revision 2.2. The following differences from the AC’97 standard are noted: • Pinout: The function of some pins has been changed to support device specific features. The PHONE and PCBEEP pins have been moved to different locations on the device package. • Package: The default package for the WM9711L is a 7 ×7mm leadless QFN package. However, it may also be supplied in a 48-pin TQFP package, as specified in the AC’97 standard. • Audio mixing: The WM9711L handles all the audio functions of a smartphone, including audio playback, voice recording, phone calls, phone call recording, ring tones, as well as simultaneous use of these features. The AC’97 mixer architecture does not fully support this. The WM9711L therefore uses a modified AC’97 mixer architecture with three separate mixers. • Tone Control, Bass Boost and 3D Enhancement: These functions are implemented in the digital domain and therefore affect only signals being played through the audio DACs, not all output signals as stipulated in AC’97. Some other functions are additional to AC’97: • On-chip BTL loudspeaker driver • On-chip BTL driver for ear speaker (phone receiver) • Auxiliary mono DAC for ring tones, system alerts etc. • 2 Analogue Comparators for Battery Alarm • Programmable Filter Characteristics for Tone Control and 3D Enhancement |
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