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WM9713L
AC’97 Audio + Touchpanel CODEC
WOLFSON MICROELECTRONICS plc
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Pre-Production, November 2011, Rev 3.3
Copyright 2011 Wolfson Microelectronics plc
DESCRIPTION
The WM9713L 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 a 4-wire or 5-wire touch-
panel, 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 analogue input and output pins are provided for
seamless integration with analogue connected wireless
communication devices.
All device functions are accessed and controlled through a
single AC-Link interface compliant with the AC’97 standard. The
24.576MHz 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.
The WM9713L 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.
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
Resistive touchpanel interface
- Supports 4-wire and 5-wire panels
- 12-bit resolution, INL 2 LSBs (<0.5 pixels)
- X, Y and touch-pressure (Z) measurement
- Pen-down detection supported in Sleep Mode
Additional PCM/I
2
S 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
Smartphones
Personal Digital Assistants (PDA)
Handheld and Tablet Computers
BLOCK DIAGRAM
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