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STM32L475VC 数据表(PDF) 136 Page - STMicroelectronics |
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STM32L475VC 数据表(HTML) 136 Page - STMicroelectronics |
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136 / 193 page  Electrical characteristics STM32L475xx 136/193 DocID027692 Rev 2 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). RAIN TS fADC CADC 2 N2 + () ln × × ---------------------------------------------------------------- RADC – < Table 65. Maximum ADC RAIN(1)(2) Resolution Sampling cycle @80 MHz Sampling time [ns] @80 MHz RAIN max (Ω) Fast channels(3) Slow channels(4) 12 bits 2.5 31.25 100 N/A 6.5 81.25 330 100 12.5 156.25 680 470 24.5 306.25 1500 1200 47.5 593.75 2200 1800 92.5 1156.25 4700 3900 247.5 3093.75 12000 10000 640.5 8006.75 39000 33000 10 bits 2.5 31.25 120 N/A 6.5 81.25 390 180 12.5 156.25 820 560 24.5 306.25 1500 1200 47.5 593.75 2200 1800 92.5 1156.25 5600 4700 247.5 3093.75 12000 10000 640.5 8006.75 47000 39000 8 bits 2.5 31.25 180 N/A 6.5 81.25 470 270 12.5 156.25 1000 680 24.5 306.25 1800 1500 47.5 593.75 2700 2200 92.5 1156.25 6800 5600 247.5 3093.75 15000 12000 640.5 8006.75 50000 50000 |
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