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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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STM32F051K4 Arkusz danych(PDF) 77 Page - STMicroelectronics |
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STM32F051K4 Arkusz danych(HTML) 77 Page - STMicroelectronics |
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77 / 104 page  Electrical characteristics STM32F051x 78/105 Doc ID 022265 Rev 3 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 55. RAIN max for fADC = 14 MHz (1) 1. Guaranteed by design, not tested in production. Ts (cycles) tS (µs) RAIN 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 NA 239.5 17.1 NA Table 56. 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 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 R AIN T S f ADC C ADC 2 N2 + () ln × × -------------------------------------------------------------- R ADC – < |
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