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L9700D-E Datasheet(PDF) 10 Page - STMicroelectronics |
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L9700D-E Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 14 page Application information L9700D-E 10/14 Doc ID 022301 Rev 1 The CIN capacitors must be used only on analog inputs because they present a low impedance during the sampling period. The minimum value for CIN is determined by the accuracy required, the time taken to sample the input and the input impedance during that time, while the maximum value is determined by the required frequency response and the value of RS. Thus for a resistive input A/D connector where: TS = sample time (seconds) RD = device input resistance (Ohms) VIN = input voltage (Volts) k = required accuracy (%) Q1 = charge on capacitor before sampling Q2 = charge on capacitor after sampling ID = device input current (Amps) Thus: but Q1 = CIN VIN and Q1 – Q2 = ID – TS so that and so The calculation for a sample and hold type convertor is even simpler: k = required accuracy (%) CH = hold capacitor (farad) Q 1 Q 2 – kQ 1 ⋅ 100 --------------- = I DTS kC IN V IN – ⋅ 100 --------------------------------- = C IN min () I D TS ⋅ V IN k ⋅ -----------------Farad = C IN min () 100 T S ⋅ kR D ⋅ ---------------------Farad = C IN min () 100 C H ⋅ k ----------------------Farad = |
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