WM8941 datasheet(91/96 Pages) WOLFSON

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Pre Production

WM8941

PP, Rev 3.3, December 2007

NOTCH FILTERS AND LOW PASS FILTER

The WM8941 supports four programmable notch filters. The fourth notch filter can be configured as

a low pass filter. The following illustrates three digital notch filters, followed by a single low pass filter

in the ADC filter path. Both the centre frequency and -3dB bandwidth are programmable for the

notch filters. The cut off frequency is programmable for the low pass filter. The following graphs

show the responses of 1) a single notch filter at three chosen centre frequencies, with three

bandwidths for each, 2) the low pass filter at three chosen cut off frequencies and 3) the cascade of

three notch filters followed by the low pass filter, each with a different centre / cut off frequency with

three bandwidths for each.

Figure 54 ADC Notch Filter Responses (48kHz); fc=100Hz, 1kHz, 10kHz; fb = 100Hz, 600Hz, 2kHz

Figure 55 ADC Low Pass Filter Responses (48kHz); fc= 1kHz, 5kHz, 10kHz

-60

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

(dB)

20k

100

200

500

10k

Frequency (Hz)

-60

-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

(dB)

20k

100

200

500

10k

Frequency (Hz)

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