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STM32F107VB データシート(PDF) 69 Page - STMicroelectronics |
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STM32F107VB データシート(HTML) 69 Page - STMicroelectronics |
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69 / 95 page ![]() STM32F105xx, STM32F107xx Electrical characteristics Doc ID 15274 Rev 4 69/95 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 51. Table 51. ADC characteristics (continued) Symbol Parameter Conditions Min Typ Max Unit Table 52. RAIN max for fADC = 14 MHz (1) 1. Based on characterization, not tested in production. Ts (cycles) tS (µs) RAIN max (kY) 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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