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STM32F427AI bảng dữ liệu(PDF) 156 Page - STMicroelectronics |
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STM32F427AI bảng dữ liệu(HTML) 156 Page - STMicroelectronics |
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156 / 231 page  Electrical characteristics STM32F427xx STM32F429xx 156/231 DocID024030 Rev 6 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 being performed on another analog input. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject negative currents. Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.17 does not affect the ADC accuracy. Figure 50. ADC accuracy characteristics 1. See also Table 76. 2. Example of an actual transfer curve. 3. Ideal transfer curve. 4. End point correlation line. 5. ET = Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves. EO = Offset Error: deviation between the first actual transition and the first ideal one. EG = Gain Error: deviation between the last ideal transition and the last actual one. ED = Differential Linearity Error: maximum deviation between actual steps and the ideal one. EL = Integral Linearity Error: maximum deviation between any actual transition and the end point correlation line. 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 by characterization results. |
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