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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS12COREUG датащи(PDF) 93 Page - Motorola, Inc |
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HCS12COREUG датащи(HTML) 93 Page - Motorola, Inc |
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93 / 124 page  MC9S12DT128B Device User Guide — V01.07 93 A.2 ATD Characteristics This section describes the characteristics of the analog to digital converter. A.2.1 ATD Operating Characteristics The Table A-8 shows 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-8 ATD Operating Characteristics A.2.2 Factors influencing accuracy Three factors – source resistance, source capacitance and current injection – have an influence on the accuracy of the ATD. A.2.2.1 Source Resistance: Due to the input pin leakage current as specified in Table A-6 in conjunction with the source resistance there will be a voltage drop from the signal source to the ATD input. The maximum source resistance RS Conditions are shown in Table A-4 unless otherwise noted Num C Rating Symbol Min Typ Max Unit 1D Reference Potential Low High VRL VRH VSSA VDDA/2 VDDA/2 VDDA V V 2C Differential Reference Voltage1 NOTES: 1. Full accuracy is not guaranteed when differential voltage is less than 4.50V VRH-VRL 4.50 5.00 5.25 V 3 D ATD Clock Frequency fATDCLK 0.5 2.0 MHz 4D ATD 10-Bit Conversion Period Clock Cycles2 Conv, Time at 2.0MHz 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 5D ATD 8-Bit Conversion Period Clock Cycles(2) Conv, Time at 2.0MHz ATD Clock fATDCLK NCONV8 TCONV8 12 6 26 13 Cycles µs 6D Stop Recovery Time (VDDA=5.0 Volts) tSR 20 µs 7 P Reference Supply current (Both ATD modules on) IREF 0.75 mA 8 P Reference Supply current (Only one ATD module on) IREF 0.375 mA |
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