WM9714L w AC97 Audio CODEC DESCRIPTION FEATURES AC97 Rev 2.2 compatible stereo CODEC The WM9714L is a highly integrated input/output device - DAC SNR 94dB, THD 85dB designed for mobile computing and communications. - ADC SNR 87dB, THD 86dB The chip is architected for dual CODEC operation, supporting hi- - Variable Rate Audio, supports all WinCE sample rates fi stereo CODEC functions via the AC link interface, and - Tone Control, Bass Boost and 3D Enhancement additionally supporting voice CODEC functions via a PCM type On-chip 45mW headphone driver Synchronous Serial Port (SSP). A third, auxiliary DAC is On-chip 400mW mono or stereo speaker drivers provided which may be used to support generation of Stereo, mono or differential microphone input supervisory tones, or ring-tones at different sample rates to the - Automatic Level Control (ALC) main CODEC. - Mic insert and mic button press detection Auxiliary mono DAC (ring tone or DC level generation) The device can connect directly to mono or stereo microphones, Seamless interface to wireless chipset stereo headphones and a stereo speaker, reducing total 2 Additional PCM/I S interface to support voice CODEC component count in the system. Cap-less connections to the PLL derived audio clocks. headphones, speakers, and earpiece may be used, saving cost Supports input clock ranging from 2.048MHz to 78.6MHz and board area. Additionally, multiple analogue input and output 1.8V to 3.6V supplies (digital down to 1.62V, speaker up to pins are provided for seamless integration with analogue 4.2V) connected wireless communication devices. 7x7mm 48-lead QFN package All device functions are accessed and controlled through a single AC-Link interface compliant with the AC97 standard. The APPLICATIONS 24.576 MHz masterclock can be input directly or generated Smartphones internally from a 13MHz (or other frequency) clock by an on-chip Personal Digital Assistants (PDA) PLL. The PLL supports a wide range of input clock from 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 Pre-Production, March 2012, Rev 3.4 To receive regular email updates, sign up at WM9714L Pre-Production TABLE OF CONTENTS 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 SIGNAL TIMING REQUIREMENTS .................................................................... 11 AC97 INTERFACE TIMING............................................................................................ 11 PCM AUDIO INTERFACE TIMING SLAVE MODE ..................................................... 15 PCM AUDIO INTERFACE TIMING MASTER MODE ................................................. 16 DEVICE DESCRIPTION ...................................................................................... 17 INTRODUCTION ............................................................................................................ 17 AUDIO PATHS OVERVIEW ........................................................................................... 18 CLOCK GENERATION .................................................................................................. 19 CLOCK DIVISION MODES ............................................................................................ 19 PLL MODE ..................................................................................................................... 22 DIGITAL INTERFACES .................................................................................................. 25 AC97 INTERFACE ......................................................................................................... 25 PCM INTERFACE .......................................................................................................... 26 AUDIO ADCS ...................................................................................................... 31 STEREO ADC ................................................................................................................ 31 RECORD SELECTOR.................................................................................................... 32 RECORD GAIN .............................................................................................................. 33 AUTOMATIC LEVEL CONTROL .................................................................................... 35 AUDIO DACS ...................................................................................................... 38 STEREO DAC ................................................................................................................ 38 VOICE DAC .................................................................................................................... 41 AUXILIARY DAC ............................................................................................................ 41 VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION .............................. 43 AUDIO INPUTS.................................................................................................... 44 LINE INPUT .................................................................................................................... 44 MICROPHONE INPUT ................................................................................................... 45 MONOIN INPUT ............................................................................................................. 51 PP, Rev 3.4, March 2012 w 2