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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F071C8 датащи(PDF) 84 Page - STMicroelectronics |
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STM32F071C8 датащи(HTML) 84 Page - STMicroelectronics |
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84 / 122 page  Electrical characteristics STM32F071x8 STM32F071xB 84/122 DocID025451 Rev 5 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). RAIN TS fADC CADC 2 N2 + () ln × × ---------------------------------------------------------------- RADC – < Table 58. RAIN max for fADC = 14 MHz Ts (cycles) tS (µs) RAIN max (kΩ)(1) 1.5 0.11 0.4 7.5 0.54 5.9 13.5 0.96 11.4 28.52.0425.2 41.52.9637.2 55.5 3.96 50 71.5 5.11 NA 239.5 17.1 NA 1. Guaranteed by design, not tested in production. Table 59. ADC accuracy(1)(2)(3) Symbol Parameter Test conditions Typ Max(4) Unit ET Total unadjusted error fPCLK = 48 MHz, fADC = 14 MHz, RAIN < 10 kΩ VDDA = 3 V to 3.6 V TA = 25 °C ±1.3 ±2 LSB EO Offset error ±1 ±1.5 EG Gain error ±0.5 ±1.5 ED Differential linearity error ±0.7 ±1 EL Integral linearity error ±0.8 ±1.5 ET Total unadjusted error fPCLK = 48 MHz, fADC = 14 MHz, RAIN < 10 kΩ VDDA = 2.7 V to 3.6 V TA = −40 to 105 °C ±3.3 ±4 LSB EO Offset error ±1.9 ±2.8 EG Gain error ±2.8 ±3 ED Differential linearity error ±0.7 ±1.3 EL Integral linearity error ±1.2 ±1.7 ET Total unadjusted error fPCLK = 48 MHz, fADC = 14 MHz, RAIN < 10 kΩ VDDA = 2.4 V to 3.6 V TA = 25 °C ±3.3 ±4 LSB EO Offset error ±1.9 ±2.8 EG Gain error ±2.8 ±3 ED Differential linearity error ±0.7 ±1.3 EL Integral linearity error ±1.2 ±1.7 1. ADC DC accuracy values are measured after internal calibration. |
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