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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PPC5605BAMLL4R 데이터시트(PDF) 78 Page - NXP Semiconductors |
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PPC5605BAMLL4R 데이터시트(HTML) 78 Page - NXP Semiconductors |
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78 / 114 page  MPC5607B Microcontroller Data Sheet, Rev. 10 Electrical characteristics NXP Semiconductors 78 Figure 18. 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 17): A charge sharing phenomenon is installed when the sampling phase is started (A/D switch close). Figure 19. Transient behavior during sampling phase RF CF RS RL RSW1 CP3 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 RSW Channel Selection Switch Impedance (two contributions RSW1 and RSW2) RAD Sampling Switch Impedance CP Pin Capacitance (three contributions, CP1, CP2 and CP3) CS Sampling Capacitance CP1 RAD Channel Selection VA CP2 Extended RSW2 Switch 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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