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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4092 датащи(PDF) 28 Page - STMicroelectronics |
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AN4092 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 38 page  ADC AN4092 28/38 Doc ID 023080 Rev 2 Equation 9 However the last constraint can’t be always fulfilled. For example when the time constant Rf(Cf+Cp) has to be big in order to filter out very low frequencies. In this case it is preferable to reduce the resistor Rf (as long as the current limitation constraint is kept) and increase Cf: it results in a very small drop due to the charge sharing and eventually a small or negligible error. EXAMPLE 1 Let’s assume that: ● Vamax = 12V ● Rs = 100Ohm ● f0 = 100KHz Using the Equation 1: Let’s choose Rf = 2.2KOhm. Then, from the Equation 3: Let’s choose Cf = 680pF. Then, from the Equation 4: Clocking the ADC at its maximum frequency (16MHz): τ 1 τ 2 T s «« R f 12 5.5 – 310 3 – ⋅ --------------------- 100 – 2K Ω ≅ ≥ C f 1 2 π100 10 3 2.2 10 3 ⋅ () ⋅ ---------------------------------------------------------- 723pF = = T s T c 1 200 10 3 ⋅ () ---------------------------- = + 5 μs = |
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