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STR730FZ1T7 数据表(PDF) 33 Page - STMicroelectronics |
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STR730FZ1T7 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 40 page ![]() STR73xF Electrical characteristics 33/40 3.11 ADC electrical characteristics VDD = 5V ± 10%, TA = -40 / +105°C, unless otherwise specified. Table 15. ADC electrical characteristics Symbol Parameter Conditions Value Unit Min Typ Max VSSA Analog Reference Ground VSS VSS V VDDA Analog Reference Voltage 4.5(1) 1. VDDA can be tied to ground when A/D converter is not in use: however extra consumption (around 200 uA) on main VDD will occur due to internal analog circuitry not being completely turned off: so, it is recommended to keep VDDA at VDD level even when not in use. VDD+0.1 V VAINX (2) 2. VAINx may exceed VSSA and VDDA limits, remaining within absolute maximum ratings, but the results of the conversion will be clamped respectively to 0x000 or 0x3FF. Analog Input voltage VSSA VDDA V fADC 10 MHz CAIN ADC Input Capacitance Not sampling Sampling 3 6 pF tS (3) 3. During the sample time the input capacitance CAIN can be charged/discharged by the external source. The internal resistance of the analog source must allow the capacitance to reach its final voltage level within tS. After the end of the sample time tS, changes to the analog input voltage have no effect on the conversion result. Values for the sample clock tS depend on programming. Sample time 10 MHz fADC 1 µs tC (4) 4. This parameter includes the sample time tS, the time for determining the digital result and the time for loading the result register with the conversion result. Conversion time 10 MHz fADC 3 µs RASRC Internal resistance of analog source 1 k Ω IINJ Input current Injection Current injection on one ADC input, different from the converted one -10 10 mA |ET| Total Unadjusted Error No current injection -2 +2 LSB Current injection on adjacent channel -7 +7 LSB |
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