WM9714L_06 Datasheet, PDF (1/94 Pages) Wolfson Microelectronics plc – AC 97 Audio CODEC

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AC’97 Audio CODEC
WM9714L
DESCRIPTION
FEATURES
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.
All device functions are accessed and controlled through a
single AC-Link interface compliant with the AC’97 standard.
The 24.576 MHz masterclock can be input directly or generated
internally from a 13MHz (or other frequency) clock by an on-chip
PLL. The PLL supports a wide range of input clock from
2.048MHz to 78.6MHz.
• 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
APPLICATIONS
• Personal Digital Assistants (PDA) with or without phone
• Smartphones
• Handheld and Tablet Computers
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