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AC’97 Audio CODEC
DESCRIPTION
The WM9714L is a highly integrated input/output device designed for mobile computing and communications. The chip is architected for dual CODEC operation, supporting Hi-Fi stereo Codec functions via the AC link interface, and additionally supporting voice Codec functions via a PCM type Synchronous Serial Port (SSP). A third, auxiliary DAC is provided which may be used to support generation of supervisory tones, or ring-tones at different sample rates to the main codec. The device can connect directly to mono or stereo microphones, stereo headphones and a stereo speaker, reducing total component count in the system. Cap-less connections to the headphones, speakers, and earpiece may be used, saving cost and board area. Additionally, multiple analog input and output pins are provided for seamless integration with analog connected wireless communication devices.
WM9714L
FEATURES
• AC’97 Rev 2.2 compatible stereo codec - DAC SNR 94dB, THD –85dB - ADC SNR 87dB, THD –86dB - Variable Rate Audio, supports all WinCE sample rates - Tone Control, Bass Boost and 3D Enhancement • On-chip 45mW headphone driver • On-chip 400mW mono or stereo speaker drivers • Stereo, mono or differential microphone input - Automatic Level Control (ALC) - Mic insert and mic button press detection • Auxiliary mono DAC (ring tone or DC level generation) • Seamless interface to wireless chipset • Additional PCM/I2S interface to support voice CODEC • PLL derived audio clocks. • Supports input clock ranging from 2.048MHz to 78.6MHz • 1.8V to 3.6V supplies (digital down to 1.62V, speaker up to 4.2V) • 7x7mm 48-lead QFN package
All device functions are accessed and controlled through a single AC-Link interface compliant with the AC’97 standard. APPLICATIONS The 24.576 MHz masterclock can be input directly or generated internally from a 13MHz (or other frequency) clock by an on-chip • Personal Digital Assistants (PDA) with or without phone PLL. The PLL supports a wide range of input clock from • Smartphones www.DataSheet4U.com • Handheld and Tablet Computers 2.048MHz to 78.6MHz. The WM9714L operates at supply voltages from 1.8V to 3.6V. Each section of the chip can be powered down under software control to save power. The device is available in a small leadless 7x7mm QFN package, ideal for use in hand-held portable systems.
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Pre-Production, June 2006, Rev 3.0 Copyright 2006 Wolfson Microelectronics plc
WM9714L TABLE OF CONTENTS
Pre-Production
DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................4 ORDERING INFORMATION ..................................................................................4 PIN DESCRIPTION ................................................................................................5 ABSOLUTE MAXIMUM RATINGS.........................................................................6 RECOMMENDED OPERATING CONDITIONS .....................................................6 ELECTRICAL CHARACTERISTICS ......................................................................7
AUDIO OUTPUTS.......................................................................................................... 7 AUDIO INPUTS.............................................................................................................. 8 AUXILIARY MONO DAC (AUXDAC).............................................................................. 8 PCM VOICE DAC (VXDAC) ........................................................................................... 8 AUXILIARY ADC............................................................................................................ 9 COMPARATORS ........................................................................................................... 9 REFERENCE VOLTAGES ............................................................................................. 9 DIGITAL INTERFACE CHARACTERISTICS................................................................ 10
POWER CONSUMPTION ....................................................................................10 DEVICE DESCRIPTION.......................................................................................11
INTRODUCTION.......................................................................................................... 11 AUDIO PATHS OVERVIEW......................................................................................... 12 CLOCK GENERATION ................................................................................................ 13 CLOCK DIVISION MODES .......................................................................................... 13 PLL MODE ................................................................................................................... 16 DIGITAL INTERFACES................................................................................................ 18 AC97 INTERFACE ....................................................................................................... 18 PCM INTERFACE ........................................................................................................ 19
AUDIO ADCS .......................................................................................................24
STEREO ADC.............................................................................................................. 24 RECORD SELECTOR ................................................................................................. 25 RECORD GAIN............................................................................................................ 26 AUTOMATIC LEVEL CONTROL.................................................................................. 27
AUDIO DACS .......................................................................................................30
STEREO DAC.............................................................................................................. 30 VOICE DAC ................................................................................................................. 33 AUXILIARY DAC.......................................................................................................... 34
VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION ...............................35 AUDIO INPUTS ....................................................................................................36
LINE INPUT ................................................................................................................. 36 MICROPHONE INPUT................................................................................................. 36 MONOIN INPUT........................................................................................................... 40 PCBEEP INPUT ........................................................................................................... 41 DIFFERENTIAL MONO INPUT .................................................................................... 42
AUDIO MIXERS....................................................................................................43
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PP Rev 3.0 June 2006 2
Pre-Production
WM9714L
MIXER OVERVIEW ..................................................................................................... 43 HEADPHONE MIXERS ................................................................................................ 43 SPEAKER MIXER ........................................................................................................ 43 MONO MIXER.............................................................................................................. 44 MIXER OUTPUT INVERTERS..................................................................................... 44
ANALOGUE AUDIO OUTPUTS ...........................................................................45
HEADPHONE OUTPUTS – HPL AND HPR................................................................. 45 MONO OUTPUT .......................................................................................................... 46 SPEAKER OUTPUTS – SPKL AND SPKR .................................................................. 47 AUXILIARY OUTPUTS – OUT3 AND OUT4 ................................................................ 48 THERMAL SENSOR .................................................................................................... 49 JACK INSERTION AND AUTO-SWITCHING............................................................... 50
DIGITAL AUDIO (SPDIF) OUTPUT......................................................................53 AUXILIARY ADC ..................................................................................................54 ADDITIONAL FEATURES....................................................................................58
BATTERY ALARM AND ANALOGUE COMPARATORS.............................................. 58 GPIO AND INTERRUPT CONTROL............................................................................ 61
POWER MANAGEMENT .....................................................................................65
INTRODUCTION........................
