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STM32F446RC 数据表(PDF) 143 Page - STMicroelectronics |
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STM32F446RC 数据表(HTML) 143 Page - STMicroelectronics |
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143 / 202 page  DocID027107 Rev 6 143/202 STM32F446xC/E Electrical characteristics 175 a Note: ADC accuracy vs. negative injection current: injecting a negative current on any analog input pins should be avoided as this significantly reduces the accuracy of the conversion Table 76. ADC static accuracy at fADC = 30 MHz(1) 1. Better performance could be achieved in restricted VDD, frequency and temperature ranges. Symbol Parameter Test conditions Typ Max(2) 2. Guaranteed based on test during characterization. Unit ET Total unadjusted error fADC = 30 MHz, RAIN < 10 kΩ, VDDA = 2.4 to 3.6 V, VREF = 1.7 to 3.6 V, VDDA −VREF < 1.2 V ±2 ±5 LSB EO Offset error ±1.5 ±2.5 EG Gain error ±1.5 ±3 ED Differential linearity error ±1 ±2 EL Integral linearity error ±1.5 ±3 Table 77. ADC static accuracy at fADC = 36 MHz(1) 1. Better performance could be achieved in restricted VDD, frequency and temperature ranges. Symbol Parameter Test conditions Typ Max(2) 2. Guaranteed based on test during characterization. Unit ET Total unadjusted error fADC =36 MHz, VDDA = 2.4 to 3.6 V, VREF = 1.7 to 3.6 V VDDA −VREF < 1.2 V ±4 ±7 LSB EO Offset error ±2 ±3 EG Gain error ±3 ±6 ED Differential linearity error ±2 ±3 EL Integral linearity error ±3 ±6 Table 78. ADC dynamic accuracy at fADC = 18 MHz - limited test conditions(1) Symbol Parameter Test conditions Min Typ Max Unit ENOB Effective number of bits fADC =18 MHz VDDA = VREF+= 1.7 V Input Frequency = 20 KHz Temperature = 25 °C 10.3 10.4 - bits SINAD Signal-to-noise and distortion ratio 64 64.2 - dB SNR Signal-to-noise ratio 64 65 - THD Total harmonic distortion -67 -72 - 1. Guaranteed based on test during characterization. Table 79. ADC dynamic accuracy at fADC = 36 MHz - limited test conditions(1) Symbol Parameter Test conditions Min Typ Max Unit ENOB Effective number of bits fADC =36 MHz VDDA = VREF+ = 3.3 V Input Frequency = 20 KHz Temperature = 25 °C 10.6 10.8 - bits SINAD Signal-to noise and distortion ratio 66 67 - dB SNR Signal-to noise ratio 64 68 - THD Total harmonic distortion - 70 - 72 - 1. Guaranteed based on test during characterization. |
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