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WM8978GEFL/RV Datasheet

  • WM8978GEFL/RV

  • STEREO CODEC WITH SPEAKER DRIVER

  • 78頁

  • WOLFSON

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Stereo CODEC With Speaker Driver
DESCRIPTION
The WM8978 is a low power, high quality stereo codec
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.
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 鈥榳ind noise reduction鈥?
The WM8978 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 WM8978 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.
WM8978
FEATURES
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Stereo Codec:
DAC SNR 98dB, THD -84dB (鈥楢鈥?weighted @ 48kHz)
ADC SNR 90dB, THD -80dB (鈥楢鈥?weighted @ 48kHz)
On-chip Headphone Driver with 鈥榗apless鈥?option
- 40mW output power into 16鈩?/ 3.3V SPKVDD
0.9W output power into 8鈩?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:
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 鈥榖eep鈥?/div>
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
5x5mm 32-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 1.7
Copyright
餂?005
Wolfson Microelectronics plc

WM8978GEFL/RV 產品屬性

  • Wolfson Microelectronics

  • 音頻編解碼器

  • + 85 C

  • SMD/SMT

  • QFN-32

  • Reel

  • - 25 C

  • 3500

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