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STM32F373VC датащи(PDF) 99 Page - STMicroelectronics |
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STM32F373VC датащи(HTML) 99 Page - STMicroelectronics |
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99 / 137 page ![]() DocID022691 Rev 7 99/137 STM32F373xx Electrical characteristics 114 Equation 1: RSRC max formula The formula above (Equation 1) is used to determine the maximum external signal source impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution). Table 61. RSRC max for fADC = 14 MHz(1) 1. Guaranteed by design. Ts (cycles) tS (µs) RSRC 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 50 239.5 17.1 50 Table 62. ADC accuracy(1)(2) (3) 1. ADC DC accuracy values are measured after internal calibration. Symbol Parameter Test conditions Typ Max(4) Unit ET Total unadjusted error fADC = 14 MHz, RSRC < 10 kΩ, VDDA = 3 V to 3.6 V TA = 25 °C ±1.3 ±3 LSB EO Offset error ±1 ±2 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 fADC = 14 MHz, RSRC < 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 fADC = 14 MHz, RSRC < 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 RSRC TS fADC CADC 2 N2 + () ln × × ---------------------------------------------------------------- RADC – < |
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