ST又出了新的数据手册 Rev 6,其中可以看出AD精度很高,跟我以前做过的试验相符,请看,第65页:
Table 46. ADC accuracy - limited test conditions Symbol Parameter Typ Max Unit ET Total unadjusted error ±1.3 ±2 LSB
关键是,Test conditions为: fPCLK2 = 56 MHz, fADC = 14 MHz, RAIN < 10 kΩ, VDDA = 3 V to 3.6 V TA = 25 °C Measurements made after ADC calibration VREF+ = VDDA
这两个地方有所限制,但对于多数使用者已经够用了: VDDA = 3 V to 3.6 V TA = 25 °C
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