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CS5366 Scheda tecnica(PDF) 28 Page - Cirrus Logic |
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CS5366 Scheda tecnica(HTML) 28 Page - Cirrus Logic |
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28 / 41 page ![]() 28 DS626F3 CS5366 4.10 Analog Connections The analog modulator samples the input at half of the internal Master Clock frequency, or 6.144 MHz nom- inally. The digital filter will reject signals within the stopband of the filter. However, there is no rejection of input signals that are at (N X 6.144 MHz) the digital passband frequency, where n=0,1,2.... Refer to Figure 15, which shows the suggested filter that will attenuate any noise energy at 6.144 MHz in addition to providing the optimum source impedance for the modulators. The use of capacitors that have a large volt- age coefficient (such as general-purpose ceramics) must be avoided since these can degrade signal linear- ity. COG capacitors are recommended for this application. For additional configurations, refer to Cirrus Application Note AN241. Figure 15. Recommended Analog Input Buffer VQ + 634 Ω 634 Ω 91 Ω 91 Ω + - - 2700 pF 470 pF 470 pF COG COG 10 uF 10 uF ADC AIN+ ADC AIN- AIN+ AIN- COG 100kΩ 10 k Ω 10 k Ω 100kΩ |
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