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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC56EL54x датащи(PDF) 121 Page - STMicroelectronics |
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SPC56EL54x датащи(HTML) 121 Page - STMicroelectronics |
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121 / 165 page  DocID15457 Rev 12 121/165 SPC56ELx, SPC564Lx Electrical characteristics 164 Equation 4: Equation 4 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 10. Input Equivalent Circuit A second aspect involving the capacitance network shall be considered. Assuming the three capacitances CF, CP1 and CP2 are initially charged at the source voltage VA (refer to the equivalent circuit reported in Figure 10): A charge sharing phenomenon is installed when the sampling phase is started (A/D switch close). V A R S R F + R EQ --------------------- 1 2 ---LSB RF CF RS RL RSW1 CP2 VREF Sampling Source Filter Current Limiter EXTERNAL CIRCUIT INTERNAL CIRCUIT SCHEME Legend: 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 CS |
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