WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet

WM8976

Manufacturer Part Number

WM8976

Description

The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8976.pdf (108 pages)

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DESCRIPTION

The WM8976 is a low power, high quality CODEC designed for

portable applications such as multimedia phone, digital still

camera or digital camcorder.

The device integrates a preamp for differential microphone, 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 ‘wind noise reduction’.

The WM8976 digital audio interface 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 WM8976 operates at analogue supply voltages from 2.5V

to 3.3V, although the digital core can operate at voltages down

to 1.71V 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.

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Stereo CODEC With Speaker Driver

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FEATURES

Stereo CODEC:

Mic Preamps:

Other Features:

APPLICATIONS

DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)

ADC SNR 95dB, THD -84dB (‘A’ weighted @ 48kHz)

On-chip Headphone Driver with ‘capless’ option

0.9W output power into 8

Differential or single-ended microphone interfaces

Low-noise bias supplied for electret microphone

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

Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and

Low power, low voltage

5x5mm 32-lead QFN package

Stereo Camcorder or DSC

Multimedia Phone

48kHz sample rates

40mW per channel into 16

Capable of driving piezo speakers

Stereo speaker drive configuration

Programmable preamp gain

Psuedo differential input with common mode rejection

Programmable ALC / Noise Gate in ADC path

2.5V to 3.6V (digital: 1.71V to 3.6V)

Pre-Production, April 2006, Rev 3.0

BTL speaker / 5V SPKVDD

2006 Wolfson Microelectronics plc

/ 3.3V SPKVDD

WM8976

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