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PC312XDP512F0CFVR Datasheet(PDF) 1251 Page - Freescale Semiconductor, Inc |
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PC312XDP512F0CFVR Datasheet(HTML) 1251 Page - Freescale Semiconductor, Inc |
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1251 / 1348 page  Appendix A Electrical Characteristics MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 1253 A.2 ATD Characteristics This section describes the characteristics of the analog-to-digital converter. A.2.1 ATD Operating Characteristics The Table A-12 and Table A-13 show conditions under which the ATD operates. The following constraints exist to obtain full-scale, full range results: VSSA ≤ VRL ≤ VIN ≤ VRH ≤ VDDA. This constraint exists since the sample buffer amplifier can not drive beyond the power supply levels that it ties to. If the input level goes outside of this range it will effectively be clipped. Table A-12. ATD 5-V Operating Characteristics Conditions are shown in Table A-4 unless otherwise noted, supply voltage 4.5 V < VDDA < 5.5 V Num C Rating Symbol Min Typ Max Unit 1 D Reference potential Low High VRL VRH VSSA VDDA/2 — — VDDA/2 VDDA V V 2 C Differential reference voltage1 1 Full accuracy is not guaranteed when differential voltage is less than 4.50 V VRH-VRL 4.50 5.00 5.5 V 3 D ATD clock frequency fATDCLK 0.5 2.0 MHz 4 D ATD 10-bit conversion period Clock cycles2 Conv, time at 2.0 MHz ATD clock fATDCLK 2 The minimum time assumes a final sample period of 2 ATD clocks cycles while the maximum time assumes a final sample period of 16 ATD clocks. NCONV10 TCONV10 14 7 — — 28 14 Cycles µs 5 D ATD 8-Bit conversion period Clock cycles2 Conv, time at 2.0 MHz ATD clock fATDCLK NCONV8 TCONV8 12 6 — — 26 13 Cycles µs 6 D Recovery time (VDDA = 5.0 Volts) tREC —— 20 µs 7 P Reference supply current 2 ATD blocks on IREF — — 0.750 mA 8 P Reference supply current 1 ATD block on IREF — — 0.375 mA |
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