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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7MC1K2-Auto датащи(PDF) 347 Page - STMicroelectronics |
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ST7MC1K2-Auto датащи(HTML) 347 Page - STMicroelectronics |
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347 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto Electrical characteristics 347/371 12.14 10-bit ADC characteristics Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified. Table 220. 10-bit ADC characteristics Symbol Parameter Conditions Min Typ Max Unit VAREF Analog reference voltage 3 VDD V fADC ADC clock frequency 4 MHz VAIN Conversion voltage range(1) VSSA VAREF V Ilkg Input leakage current for analog input ±1 µA Negative input leakage current on analog pins VIN < VSS, | IIN |< 400µA on adjacent analog pin 56 RAIN External input impedance see Figure 158 and Figure 159 (2)(3)(4) k Ω CAIN External capacitor on analog input pF fAIN Variation freq. of analog input signal Hz CADC Internal sample and hold capacitor 6 pF tADC Conversion time (sample+hold) fCPU = 8 MHz, fADC =4MHz, ADSTS bit in MCCBCR register = 0 3.5 µs – Sample capacitor loading time – Hold conversion time 4 10 1/fADC Conversion time (sample+hold) fCPU = 8 MHz, fADC =4MHz, ADSTS bit in MCCBCR register = 1 6.5 µs – Sample capacitor loading time – Hold conversion time 16 10 1/fADC RAREF Analog reference input resistor 11 k Ω 1. When VSSA pins are not available on the pinout, the ADC refer to VSS. 2. Any added external serial resistor downgrades the ADC accuracy (especially for resistance greater than 10k Ω). Data based on characterization results, not tested in production. 3. CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad capacitance (3pF). A high CPARASITIC value downgrades conversion accuracy. To remedy this, fADC should be reduced. 4. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and decreased to allow the use of a larger serial resistor (RAIN). Obsolete Product(s) - Obsolete Product(s) |
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