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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN1636 датащи(PDF) 21 Page - STMicroelectronics |
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AN1636 датащи(HTML) 21 Page - STMicroelectronics |
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21 / 42 page  21/42 UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS Figure 17. ADC input with RAIN, CAIN The external capacitance will not allow the voltage of the analog input to be exactly the same as VIN if it is not fully charged by the analog source. If the analog input signal varies, then the analog signal frequency (FAIN) should be such that the time period of this analog signal is at least 10 * RAIN * CAIN. Figure 18. Recommended RAIN, CAIN values TAIN = time period of analog signal = 1/FAIN TAIN >= 10 * RAIN * CAIN. FAIN = 1/ TAIN <= 1/ (10 * RAIN * CAIN ) For example: For RAIN = 10K, CAIN = 10nf TAIN = 10 RAIN * CAIN = 10 * 10K* 10n = 1000µs = 1ms FAIN = 1/TAIN = 1/1ms = 1KHz maximum. AINx VAIN RAIN CAIN ST72x Cp Cp = Parasitic capacitance CAIN = Source capacitance 0.1 1 10 100 1000 0.01 0.1 1 10 fAIN(KHz) Cain 10 nF Cain 22 nF Cain 47 nF |
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