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WM8734 датащи(PDF) 38 Page - Wolfson Microelectronics plc |
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WM8734 датащи(HTML) 38 Page - Wolfson Microelectronics plc |
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38 / 46 page ![]() WM8734 Production Data w PD Rev 4.1 November 2006 38 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0 USB/ NORMAL 0 Mode Select 1 = USB mode (250/272fs) 0 = Normal mode (256/384fs) 1 BOSR 0 Base Over-Sampling Rate 0 = 256fs 1 = 384fs 5:2 SR[3:0] 0000 ADC and DAC sample rate control 0001000 Sampling Control 6 CLKIDIV2 0 Core Clock divider select 1 = Core Clock is MCLK divided by 2 0 = Core Clock is MCLK 0001001 Active Control 0 ACTIVE 0 Activate Interface 1 = Active 0 = Inactive Table 21 Register Map Description Note: Unused register bits should be set to ‘0’ except when writing to Register 0000110, when bits 1,5 and 6 should be set to ‘1’. DIGITAL FILTER CHARACTERISTICS The ADC and DAC employ different digital filters. There are 4 types of digital filter, called Type 0, 1, 2 and 3. The performance of Types 0 and 1 is listed in the table below, the responses of all filters is shown in the proceeding pages. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ADC Filter Type 0 (USB Mode, 250fs operation) +/- 0.05dB 0 0.416fs Passband -6dB 0.5fs Passband Ripple +/- 0.05 dB Stopband 0.584fs Stopband Attenuation f > 0.584fs -60 dB ADC Filter Type 1 (USB mode, 272fs or Normal mode operation) +/- 0.05dB 0 0.4535fs Passband -6dB 0.5fs Passband Ripple +/- 0.05 dB Stopband 0.5465fs Stopband Attenuation f > 0.5465fs -60 dB High Pass Filter Corner Frequency -3dB -0.5dB -0.1dB 3.7 10.4 21.6 Hz DAC Filter Type 0 (USB mode, 250fs operation) +/- 0.03dB 0 0.416fs Passband -6dB 0.5fs Passband Ripple +/-0.03 dB Stopband 0.584fs Stopband Attenuation f > 0.584fs -50 dB DAC Filter Type 1 (USB mode, 272fs or Normal mode operation) +/- 0.03dB 0 0.4535fs Passband -6dB 0.5fs Passband Ripple +/- 0.03 dB Stopband 0.5465fs Stopband Attenuation f > 0.5465fs -50 dB Table 22 Digital Filter Characteristics |
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