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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 1253 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 1253 Page - Freescale Semiconductor, Inc |
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1253 / 1348 page  Appendix A Electrical Characteristics MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 1255 A.2.2.3 Current Injection There are two cases to consider. 1. A current is injected into the channel being converted. The channel being stressed has conversion values of $3FF ($FF in 8-bit mode) for analog inputs greater than VRH and $000 for values less than VRL unless the current is higher than specified as disruptive condition. 2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy of the conversion depending on the source resistance. The additional input voltage error on the converted channel can be calculated as: VERR = K * RS * IINJ with IINJ being the sum of the currents injected into the two pins adjacent to the converted channel. Table A-14. ATD Electrical Characteristics Conditions are shown in Table A-4 unless otherwise noted Num C Rating Symbol Min Typ Max Unit 1 C Max input source resistance RS —— 1 K Ω 2 T Total input capacitance Non sampling Sampling CINN CINS — — — — 10 22 pF 3 C Disruptive analog input current1 1 See also Table A-7. item 14 INA –2.5 — 2.5 mA 4 C Coupling ratio positive current injection Kp —— 10-4 A/A 5 C Coupling ratio negative current injection Kn —— 10-2 A/A |
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