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MAC7100EC Datasheet(PDF) 23 Page - Motorola, Inc |
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MAC7100EC Datasheet(HTML) 23 Page - Motorola, Inc |
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23 / 48 page  23 MAC7100 Microcontroller Family Hardware Specifications MOTOROLA PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Electrical Characteristics 3.10 Analog-to-Digital Converter Characteristics Table 24 and Table 25 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 because the sample buffer amplifier cannot drive beyond the ATD power supply levels. If the input level goes outside of this range it will effectively be clipped. 3.10.1 Factors Influencing Accuracy Three factors — source resistance, source capacitance and current injection — have an influence on the accuracy of the ATD. Table 24. ATD Operating Characteristics in 5 V Range Conditions shown in Table 6 unless otherwise noted Num C Rating Symbol Min Typ Max Unit M1 D Reference Potential Low High VRL VRH VSSA VDDA ÷ 2 — — VDDA ÷ 2 VDDA V V M2 C Differential Reference Voltage 1 1 Full accuracy is not guaranteed when differential voltage is less than 4.50 V VRH – VRL 4.50 5.00 5.25 V M3 D ATD Clock Frequency fATDCLK 0.5 — 2.0 MHz M4 D ATD 10-bit Conversion PeriodClock Cycles 2 @ 2.0MHz fATDCLK 2 Minimum time assumes final sample period of 2 ATD clocks; maximum time assumes final sample period of 16 ATD clocks. NCONV10 TCONV10 14 7 — — 28 14 Cycles µs M5 D ATD 8-bit Conversion PeriodClock Cycles 2 @ 2.0MHz fATDCLK NCONV8 TCONV8 12 6 — — 26 13 Cycles µs M6 D Recovery Time (VDDA = 5.0 V) tREC —— 20 µs M7 P Reference Supply current 1 ATD module enabled IREF —— 0.375 mA M8 P Reference Supply current 2 ATD modules enabled IREF —— 0.750 mA Table 25. ATD Operating Characteristics in 3.3 V Range Conditions shown in Table 6, with VDDX = 3.3 V ±10% and a temperature maximum of +140°C unless otherwise noted. Num C Rating Symbol Min Typ Max Unit N1 D Reference Potential Low High VRL VRH VSSA VDDA ÷ 2 — — VDDA ÷ 2 VDDA V V N2 C Differential Reference Voltage 1 1 Full accuracy is not guaranteed when differential voltage is less than 3.0 V VRH–VRL 3.0 3.3 3.6 V N3 D ATD Clock Frequency fATDCLK 0.5 — 2.0 MHz N4 D ATD 10-bit Conversion PeriodClock Cycles 2 Conv, Time at 2.0MHz ATD Clock fATDCLK 2 Minimum time assumes final sample period of 2 ATD clocks; maximum time assumes final sample period of 16 ATD clocks. NCONV10 TCONV10 14 7 — — 28 14 Cycles µs N5 D ATD 8-bit Conversion PeriodClock Cycles 2 Conv, Time at 2.0MHz ATD Clock fATDCLK NCONV8 TCONV8 12 6 — — 26 13 Cycles µs N6 D Recovery Time (VDDA=5.0 V) tREC —— 20 µs N7 P Reference Supply current 1 ATD module enabled IREF —— 0.375 mA N8 P Reference Supply current 2 ATD modules enabled IREF —— 0.250 mA Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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