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STM32F427AI 数据表(PDF) 162 Page - STMicroelectronics |
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STM32F427AI 数据表(HTML) 162 Page - STMicroelectronics |
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162 / 240 page  Electrical characteristics STM32F427xx STM32F429xx 162/240 DS9405 Rev 12 Figure 51. Typical connection diagram when using the ADC with FT/TT pins featuring the analog switch function 1. Refer to Table 75: ADC characteristics for the values of RAIN, RADC, and CADC. 2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad capacitance (refer to Table 57: I/O static characteristics). A high Cparasitic value downgrades conversion accuracy. To remedy this, fADC should be reduced. 3. Refer to Table 57: I/O static characteristics for the value of IIkg. 4. Refer to Figure 22: Power supply scheme. MSv67871V3 Sample-and-hold ADC converter Converter Cparasitic (2) Ilkg (3) CADC VDDA (4) RAIN (1) VAIN RADC VREF+ (4) VSSA I/O analog switch Sampling switch with multiplexing VSS VSS |
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