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WM8941GEFL/V датащи(PDF) 91 Page - Wolfson Microelectronics plc

номер детали WM8941GEFL/V
подробное описание детали  Mono CODEC with Speaker Driver and Video Buffer
PDF  96 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8941GEFL/V датащи(HTML) 91 Page - Wolfson Microelectronics plc

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Pre Production
WM8941
w
PP, Rev 3.3, December 2007
91
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
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Frequency (Hz)
-60
+0
-55
-50
-45
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Frequency (Hz)
T
T



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