WM9714LGEFLSLASHV datasheet(11/94 Pages) WOLFSON

11 / 94 page

Pre-Production

WM9714L

PP Rev 3.0 June 2006

DEVICE DESCRIPTION

INTRODUCTION

The WM9714L is a largely pin compatible upgrade to WM9712, with a PCM voice codec added. This

codec is interfaced via a PCM type audio interface which makes use of GPIO pins for connection.

It is designed to meet the mixed-signal requirements of portable and wireless smartphone systems. It

includes audio recording and playback, battery monitoring, auxiliary ADC and GPIO functions, all

controlled through a single 5-wire AC-Link interface. Additionally, PCM voice codec functions are

supported through provision of an additional voice DAC and a PCM audio serial interface.

A PLL is included to allow unrelated reference clocks to be used for generation of the AC link system

clock. Typically 13MHz or 2.048MHz references might be used as a reference.

SOFTWARE SUPPORT

The basic audio features of the WM9714L are software compatible with standard AC’97 device

drivers. However, to better support 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 WM9714L 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 WM9714L is a 7

×7mm leadless QFN

package.

•

Audio mixing: The WM9714L 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 WM9714L 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 for mono or stereo speakers

•

On-chip BTL driver for ear speaker (phone receiver)

•

Auxiliary mono DAC for ring tones, system alerts etc.

•

Auxiliary ADC Inputs

•

2 Analogue Comparators for Battery Alarm

•

Programmable Filter Characteristics for Tone Control and 3D Enhancement

•

PCM interface to additional Voice DAC and existing audio ADCs

•

PLL to create AC’97 system clock from unrelated reference clock input

PCM CODEC

The PCM voice codec functions typically required by mobile telephony devices are provided by an

extra voice DAC on the WM9714L, which is interfaced via a standard PCM type data interface, which

is constructed through optional use of 4 of the GPIO pins on WM9714L. The audio output data from

one or both of the audio ADCs can also be output over this PCM interface, allowing a full voice codec

function to be implemented. This PCM interface supports sample rates from 8 to 48ks/s using the

standard AC’97 master clock.

WM9714LGEFL/V Datasheet(PDF) 11 Page - Wolfson Microelectronics plc

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