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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SPC560P34L1 데이터시트(PDF) 70 Page - STMicroelectronics |
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SPC560P34L1 데이터시트(HTML) 70 Page - STMicroelectronics |
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70 / 103 page  Electrical characteristics SPC560P34L1, SPC560P34L3, SPC560P40L1, SPC560P40L3 70/103 Doc ID 16100 Rev 7 Figure 16. 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 16): A charge sharing phenomenon is installed when the sampling phase is started (A/D switch closed). Figure 17. Transient behavior during sampling phase RF CF RS RL RSW 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 RSW: Channel selection switch impedance RAD: Sampling switch impedance CP: Pin capacitance (two contributions, CP1 and CP2) CS: Sampling capacitance VA VA1 VA2 t TS VCS Voltage Transient on CS ΔV < 0.5 LSB 1 2 τ1 < (RSW + RAD) CS << TS τ2 = RL (CS + CP1 + CP2) |
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