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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SPC56AP54X 데이터시트(PDF) 77 Page - STMicroelectronics |
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SPC56AP54X 데이터시트(HTML) 77 Page - STMicroelectronics |
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77 / 104 page  SPC56xP54x, SPC56xP60x Electrical characteristics Doc ID 18340 Rev 3 77/104 Figure 17. Input equivalent circuit (extended channels) 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 close). Figure 18. Transient behavior during sampling phase RF CF RS RL RSW1 CP3 CS VDD Sampling Source Filter Current Limiter EXTERNAL CIRCUIT INTERNAL CIRCUIT SCHEME CP1 RAD Channel Selection VA CP2 Extended RSW2 Switch RS: Source impedance RF: Filter resistance CF: Filter capacitance RL: Current limiter resistance RSW1: Channel selection switch impedance (two contributions, RSW1 and RSW2) RAD: Sampling switch impedance CP: Pin capacitance (two contributions, CP1, CP2 and CP3) CS: Sampling capacitance VA VA1 VA2 t TS VCS Voltage Transient on CS V <0.5 LSB 1 2 1 < (RSW + RAD) CS << TS 2 = RL (CS + CP1 + CP2) |
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