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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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STM32F107VB Fiches technique(PDF) 75 Page - STMicroelectronics |
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STM32F107VB Fiches technique(HTML) 75 Page - STMicroelectronics |
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75 / 108 page  DocID15274 Rev 10 75/108 STM32F105xx, STM32F107xx Electrical characteristics 107 Equation 1: RAIN max formula The formula above (Equation 1) is used to determine the maximum external impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution). tlat(2) Injection trigger conversion latency fADC = 14 MHz - - 0.214 µs -- - 3(4) 1/fADC tlatr(2) Regular trigger conversion latency fADC = 14 MHz - - 0.143 µs -- - 2(4) 1/fADC tS(2) Sampling time fADC = 14 MHz 0.107 - 17.1 µs - 1.5 - 239.5 1/fADC tSTAB(2) Power-up time - 0 0 1 µs tCONV(2) Total conversion time (including sampling time) fADC = 14 MHz 1 - 18 µs - 14 to 252 (tS for sampling +12.5 for successive approximation) 1/fADC 1. Based on characterization, not tested in production. 2. Guaranteed by design, not tested in production. 3. VREF+ is internally connected to VDDA and VREF- is internally connected to VSSA. 4. For external triggers, a delay of 1/fPCLK2 must be added to the latency specified in Table 52. Table 52. ADC characteristics (continued) Symbol Parameter Conditions Min Typ Max Unit Table 53. RAIN max for fADC = 14 MHz(1) 1. Based on characterization, not tested in production. Ts (cycles) tS (µs) RAIN max (kΩ) 1.5 0.11 0.4 7.5 0.54 5.9 13.5 0.96 11.4 28.5 2.04 25.2 41.5 2.96 37.2 55.5 3.96 50 71.5 5.11 NA 239.5 17.1 NA R AIN T S f ADC C ADC 2 N2 + () ln × × ---------------------------------------------------------------- R ADC – < |
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