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MPC5744P Datasheet(PDF) 84 Page - Freescale Semiconductor, Inc |
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MPC5744P Datasheet(HTML) 84 Page - Freescale Semiconductor, Inc |
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84 / 114 page  MPC5744P Data Sheet, Rev. 0.3 Preliminary—Subject to Change Without Notice Electrical characteristics Freescale Semiconductor 84 The considerations above lead to impose new constraints on the external circuit, to reduce the accuracy error due to the voltage drop on CS; from the two charge balance equations above, it is simple to derive Equation 16 between the ideal and real sampled voltage on CS: Eqn. 16 From this formula, in the worst case (when VA is maximum, that is for instance 5 V), assuming to accept a maximum error of half a count, a constraint is evident on CF value: Eqn. 17 Table 32. ADC conversion characteristics Symbol C Parameter Conditions1 Min Typ Max Unit fCK SR — ADC Clock frequency (depends on ADC configuration) (The duty cycle depends on AD_CK2 frequency) —20 — 80 MHz fs SR — Sampling frequency — — — 1.00 MHz tsample CC D Sample time3 80 MHz@200 Ohm source impedance 275 — — ns tconv CC D Conversion time4 80 MHz 650 — — ns CS 5 CC D ADC input sampling capacitance — — 3 5 pF CP1 5 CC D ADC input pin capacitance 1 - TBD not in ADC spec —— — 5(6) pF CP2 5 CC D ADC input pin capacitance 2 - TBD not in ADC spec —— — 0.8 pF RSW1 5 CC D Internal resistance of analog source - TBD not in ADC spec VREF range = 4.5 to 5.5 V — — 0.3 k Ω CC VREF range = 3.0 to 3.6 V — — 875 Ω RAD 5 CC D Internal resistance of analog source - TBD not in ADC spec — — — 825 Ω INL CC D Integral non linearity — –2 — 2 LSB DNL CC D Differential non linearity7 —–1 — 1 LSB OFS CC T Offset error — –4 — 4 LSB GNE CC T Gain error — –4 — 4 LSB Input (single ADC channel) CC D Max leakage 150C — — 250 nA CC D Max positive/negative injection –3 — 3 mA V A V A2 ------------ C P1 C P2 +C F + C P1 C P2 +C F C S ++ -------------------------------------------------------- = C F 2048 C S • > |
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