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AN1636 Datasheet(PDF) 22 Page - STMicroelectronics |
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AN1636 Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 42 page  22/42 UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS Figure 19. Effect of external R and C. The voltage across the capacitor follows the following equation: Vc = VIN (1 - e -t/RC) Vc = Voltage across capacitor VIN = Voltage from voltage source e = Exponential constant = 2.71 (approx.) t= Time, after which voltage across the capacitor is to be calculated. R = Resistance used to charge the capacitor C= Capacitance value. R*C = time constant of RC network Table 2. Voltage across the capacitor It should be noted that when the ratio of t/RC increases, the voltage developed across the ca- pacitor becomes nearly equal to VIN. The conversion result will be correct only when the ca- pacitor is fully charged. Therefore, t >= 10*R*C. t/RC Vc/ VIN Vc 1 (1- (2.71)-1)0.63* VIN 2 (1- (2.71)-2)0.86* VIN 3 (1- (2.71)-3)0.94* VIN 4 (1- (2.71)-4)0.98* VIN 8 (1- (2.71)-8) 0.9996* VIN 10 (1- (2.71)-10) 0.9999Vin Input Signal Signal at analog input (=across External capacitor not charged to VIN Cain) |
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