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WM8941 Datasheet(PDF) 91 Page - Wolfson Microelectronics plc |
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WM8941 Datasheet(HTML) 91 Page - Wolfson Microelectronics plc |
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91 / 96 page  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 +0 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 R E S P O N S E (dB) 20 20k 50 100 200 500 1k 2k 5k 10k Frequency (Hz) -60 +0 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 R E S P O N S E (dB) 20 20k 50 100 200 500 1k 2k 5k 10k Frequency (Hz) T T |
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