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STM32F373C8 データシート(PDF) 99 Page - STMicroelectronics |
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STM32F373C8 データシート(HTML) 99 Page - STMicroelectronics |
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99 / 131 page ![]() DocID022691 Rev 4 99/131 STM32F37xxx 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, not tested in production. 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 T S f ADC C ADC 2 N2 + () ln × × -------------------------------------------------------------- R ADC – < |
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