wm9711lgefl-v Wolfson Microelectronics plc, wm9711lgefl-v Datasheet - Page 12

• Manufacturer Part Number: wm9711lgefl-v
• Description: Low Power Audio Codec For Portable Applications
• Manufacturer: Wolfson Microelectronics plc

WM9711L
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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:
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Some other functions are additional to AC’97:
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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.
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.
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
PD Rev 4.3 August 2006
Production Data
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