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MPC5644BCAMMJ1 Datenblatt(PDF) 73 Page - NXP Semiconductors |
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MPC5644BCAMMJ1 Datenblatt(HTML) 73 Page - NXP Semiconductors |
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73 / 116 page ![]() Electrical Characteristics MPC5646C Microcontroller DataSheet, Rev. 7 NXP Semiconductors 73 path to ground. For instance, assuming a conversion rate of 1MHz, with CS+Cp2 equal to 3pF, a resistance of 330KΩ is obtained (Reqiv = 1 / (fc*(CS+Cp2)), 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+Cp2) and the sum of RS + RF, the external circuit must be designed to respect the following relation Eqn. 4 The formula above provides a constraint for external network design, in particular on resistive path. Figure 16. Input equivalent circuit VA RS RF + REQ --------------------- • 1 2 ---LSB < RF CF RS RL RSW 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 RSW 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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