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STM32F103CBT6 数据表(PDF) 77 Page - STMicroelectronics |
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STM32F103CBT6 数据表(HTML) 77 Page - STMicroelectronics |
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77 / 102 page  STM32F103x8, STM32F103xB Electrical characteristics Doc ID 13587 Rev 14 77/102 Figure 37. ADC accuracy characteristics Table 49. ADC accuracy(1) (2) (3) 1. ADC DC accuracy values are measured after internal calibration. 2. Better performance could be achieved in restricted VDD, frequency and temperature ranges. 3. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non- robust) 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 standard analog pins which may potentially inject negative current. Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 5.3.12 does not affect the ADC accuracy. Symbol Parameter Test conditions Typ Max(4) 4. Based on characterization, not tested in production. Unit ET Total unadjusted error fPCLK2 = 56 MHz, fADC = 14 MHz, RAIN < 10 kΩ, VDDA = 2.4 V to 3.6 V Measurements made after ADC calibration ±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 EO EG 1LSBIDEAL (1) Example of an actual transfer curve (2) The ideal transfer curve (3) End point correlation line 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. 4095 4094 4093 5 4 3 2 1 0 7 6 1 2 3 456 7 4093 4094 4095 4096 (1) (2) ET ED EL (3) VDDA VSSA ai14395b VREF+ 4096 (or depending on package)] VDDA 4096 [1LSBIDEAL = |
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