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WM8510GEDS/RV データシート(PDF) 78 Page - Wolfson Microelectronics plc |
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WM8510GEDS/RV データシート(HTML) 78 Page - Wolfson Microelectronics plc |
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78 / 81 page  WM8510 Production Data w PD Rev 4.1 December 2006 78 HIGHPASS FILTER The WM8510 has a selectable digital highpass filter in the ADC filter path. This filter has two modes, audio and applications. In audio mode the filter is a 1 st order IIR with a cut-off of around 3.7Hz. In applications mode the filter is a 2 nd order high pass filter with a selectable cut-off frequency. -40 -35 -30 -25 -20 -15 -10 -5 0 5 0 5 10 15 20 25 30 35 40 45 Frequency (Hz) Figure 46 ADC Highpass Filter Response, HPFAPP=0 -60 -50 -40 -30 -20 -10 0 10 0 200 400 600 800 1000 1200 Frequency (Hz) -80 -70 -60 -50 -40 -30 -20 -10 0 10 0 200 400 600 800 1000 1200 Frequency (Hz) Figure 47 ADC Highpass Filter Responses (48kHz), HPFAPP=1, all cut-off settings shown. Figure 48 ADC Highpass Filter Responses (24kHz), HPFAPP=1, all cut-off settings shown. -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 0 200 400 600 800 1000 1200 Frequency (Hz) Figure 49 ADC Highpass Filter Responses (12kHz), HPFAPP=1, all cut-off settings shown. |
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