WM8946ECSSLASHR datasheet(36/175 Pages) WOLFSON

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WM8946

Production Data

PD, July 2012, Rev 4.3

Typical applications for the notch filters are filtering of fixed-frequency noise or resonances; these

might arise from a motor (e.g. DSC zoom lens motor) or from characteristics of the application

housing. Example plots of the Notch filter response are shown in Figure 16.

Notch Response - Slave Mode - fc=1kHz, fb=1kHz Depth 0 to 100%

-100

-90

-80

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520

1.5k

550 600 650 700 750 800 850 900

1.2k

Notch Response - Slave Mode - fc=1kHz, fb=100, 500, 1k, 5k, 10kHz -

Depth=100%

-100

-90

-80

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20k

100

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10k

1kHz notch, bandwidth 1kHz, depth 0% to 100% in 20% steps

1kHz notch, 100% depth, bandwidth 100Hz, 500Hz, 1kHz, 5kHz, 10kHz

Notch Response - Slave Mode - fc=200, 500, 1k, 2k, 5k, 10kHz, fb=fc/2,

Depth 100%

-100

-90

-80

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20k

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TTTTTTTTTTTTT

5 notches, bandwidth Fcentre/2, depth 100%

Figure 16 Notch Filter Responses

WM8946ECS/R Datasheet(PDF) 36 Page - Wolfson Microelectronics plc

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