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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F271Z1 датащи(PDF) 149 Page - STMicroelectronics |
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ST10F271Z1 датащи(HTML) 149 Page - STMicroelectronics |
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149 / 185 page  ST10F271Z1 Electrical characteristics 149/185 From this formula, in the worst case (when VA is maximum, that is for instance 5 V), assuming to accept a maximum error of half a count (~2.44 mV), it is immediately evident a constraints on CF value: In the next section an example of how to design the external network is provided, assuming some reasonable values for the internal parameters and making hypothesis on the characteristics of the analog signal to be sampled. Example of external network sizing The following hypothesis are formulated in order to proceed in designing the external network on A/D Converter input pins: ● Analog signal source bandwidth (f0): 10 kHz ● Conversion rate (fC): 25 kHz ● Sampling time (TS): 1 µs ● Pin input capacitance (CP1): 5 pF ● Pin input routing capacitance (CP2): 1 pF ● Sampling capacitance (CS): 4 pF ● Maximum input current injection (IINJ): 3 mA ● Maximum analog source voltage (VAM):12 V ● Analog source impedance (RS): 100 Ω ● Channel switch resistance (RSW): 500 Ω ● Sampling switch resistance (RAD): 200 Ω CF 2048 CS ⋅ > |
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