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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC560D30L3 датащи(PDF) 57 Page - STMicroelectronics |
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SPC560D30L3 датащи(HTML) 57 Page - STMicroelectronics |
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57 / 82 page  DS6494 Rev 8 57/82 SPC560D30x, SPC560D40x Electrical characteristics 77 impedance of the transducer or circuit supplying the analog signal to be measured. The filter at the input pins must be designed taking into account the dynamic characteristics of the input signal (bandwidth) and the equivalent input impedance of the ADC itself. In fact a current sink contributor is represented by the charge sharing effects with the sampling capacitance: being CS and Cp2 substantially two switched capacitances, with a frequency equal to the conversion rate of the ADC, it can be seen as a resistive path to ground. For instance, assuming a conversion rate of 1 MHz, with CS+Cp2 equal to 3 pF, a resistance of 330 k is obtained (REQ = 1 / (fc ×(CS+Cp2)), where fc represents the conversion rate at the considered channel). To minimize the error induced by the voltage partitioning between this resistance (sampled voltage on CS+Cp2) and the sum of RS + RF, the external circuit must be designed to respect the Equation 4: Equation 4 Equation 4 generates a constraint for external network design, in particular on a resistive path. Figure 12. Input equivalent circuit (precise channels) VA RS RF + REQ --------------------- 1 2 ---LSB RF CF RS RL RSW1 CP2 CS VDD Sampling Source Filter Current Limiter EXTERNAL CIRCUIT INTERNAL CIRCUIT SCHEME CP1 RAD Channel Selection VA RS: Source impedance RF: Filter resistance CF: Filter capacitance RL: Current limiter resistance RSW1: Channel selection switch impedance RAD: Sampling switch impedance CP: Pin capacitance (two contributions, CP1 and CP2) CS: Sampling capacitance |
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