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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC5645S датащи(PDF) 90 Page - Freescale Semiconductor, Inc |
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MPC5645S датащи(HTML) 90 Page - Freescale Semiconductor, Inc |
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90 / 146 page  Qorivva MPC5645S Microcontroller Data Sheet, Rev. 8 90 Freescale Semiconductor In fact a current sink contributor is represented by the charge sharing effects with the sampling capacitance: CS being substantially a switched capacitance, 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 equal to 3 pF, a resistance of 330k is obtained (REQ = 1 / (fc*CS), 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) and the sum of RS + RF + RL + RSW + RAD, the external circuit must be designed to respect the Equation 5: Eqn. 5 Equation 5 generates a constraint for external network design, in particular on resistive path. Internal switch resistances (RSW and RAD) can be neglected with respect to external resistances. Figure 12. Input Equivalent Circuit (Precise Channels) V A R S R F R L R SW R AD ++ + + R EQ --------------------------------------------------------------------------- 1 2 ---LSB RF CF RS RL RSW1 CP2 CS VDD Sampling Source Filter Current Limiter EXTERNAL CIRCUIT INTERNAL CIRCUIT SCHEME 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 CP1 RAD Channel Selection VA |
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