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DESCRIPTION
The WM8980 is a low power, high quality stereo codec with
integrated video buffer designed for portable applications such
as Digital still camera or Digital Camcorder.
The device integrates preamps for stereo differential mics, and
includes drivers for speakers, headphone and differential or
stereo line output. External component requirements are
reduced as no separate microphone or headphone amplifiers
are required.
An integrated video buffer is provided which has programmable
gain from 0-6dB, sync-tip clamp and a 3
rd
order input low pass
filter for signal re-construction.
Advanced on-chip digital signal processing includes a 5-band
equaliser, a mixed signal Automatic Level Control for the
microphone or line input through the ADC as well as a purely
digital limiter function for record or playback. Additional digital
filtering options are available in the ADC path, to cater for
application filtering such as ‘wind noise reduction’.
The WM8980 CODEC can operate as a master or a slave. An
internal PLL can generate all required audio clocks for the
Codec from common reference clock frequencies, such as
12MHz and 13MHz.
The WM8980 operates at analogue supply voltages from 2.5V
to 3.3V, although the digital core can operate at voltages down
to 1.62V to save power. The speaker outputs and OUT3/4 line
outputs can run from a 5V supply if increased output power is
required. Individual sections of the chip can also be powered
down under software control.
WM8980
Stereo CODEC With Speaker Driver and Video Buffer
FEATURES
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Stereo Codec:
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
ADC SNR 90dB, THD -80dB (‘A’ weighted @ 48kHz)
On-chip Headphone Driver with ‘capless’ option
- 40mW output power into 16Ω / 3.3V SPKVDD
0.9W output power into 8Ω BTL speaker / 5V SPKVDD
- Capable of driving piezo speakers
- Stereo speaker drive configuration
Mic Preamps:
Stereo Differential or mono microphone Interfaces
- Programmable preamp gain
- Psuedo differential inputs with common mode rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
Other features:
Integrated 0-6dB video buffer with LPF filter and clamp.
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band Equaliser (record or playback)
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
Aux inputs for stereo analog input signals or ‘beep’
On-chip PLL supporting 12, 13, 19.2MHz and other clocks
Low power, low voltage
- 2.5V to 3.6V (digital core: 1.62V to 3.6V)
- power consumption <30mW all-on with 2.5V supplies
6x6mm 40-pin QFN package
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APPLICATIONS
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Stereo Camcorder or DSC
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Product Preview, January 2005, Rev 1.6
Copyright
2005
Wolfson Microelectronics plc
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
