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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F103CBT6TR датащи(PDF) 75 Page - STMicroelectronics |
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STM32F103CBT6TR датащи(HTML) 75 Page - STMicroelectronics |
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75 / 116 page  RAIN TS fADC CADC 2 N2 + ln -------------------------------------------------------------- RADC – DS5319 Rev 18 75/116 STM32F103x8, STM32F103xB Electrical characteristics 115 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). Table 47. RAIN max for fADC = 14 MHz(1) 1. Evaluated by characterization, not tested in production, unless otherwise specified. Ts (cycles) tS (µs) RAIN max (k) 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 Table 48. ADC accuracy - Limited test conditions(1) (2) 1. ADC DC accuracy values are measured after internal calibration. 2. Injecting a negative current on any analog input pins should be avoided as this significantly reduces the accuracy of the conversion being performed on another analog input. It is recommended to add a Schottky diode (pin to ground) to analog pins that may potentially inject negative currents. Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in Section 5.3.12 does not affect the ADC accuracy. Symbol Parameter Test conditions Typ Max(3) 3. Evaluated by characterization, not tested in production, unless otherwise specified. Unit ET Total unadjusted error fPCLK2 = 56 MHz, fADC = 14 MHz, RAIN < 10 kΩ, VDDA = 3 V to 3.6 V, TA = 25 °C Measurements made after ADC calibration ±1.3 ±2 LSB EO Offset error ±1.0 ±1.5 EG Gain error ±0.5 ±1.5 ED Differential linearity error ±0.7 ±1.0 EL Integral linearity error ±0.8 ±1.5 |
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