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STM32F101X4 Datasheet(PDF) 61 Page - STMicroelectronics |
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STM32F101X4 Datasheet(HTML) 61 Page - STMicroelectronics |
61 / 73 page STM32F101x4, STM32F101x6 Electrical characteristics Doc ID 15058 Rev 3 61/74 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). Table 42. RAIN max for fADC = 14 MHz (1) 1. Guaranteed by design, not tested in production. Ts (cycles) tS (µs) RAIN max (k) 1.5 0.11 0.4 7.5 0.54 5.9 13.5 0.96 11.4 28.5 2.04 25.2 41.5 2.96 37.2 55.5 3.96 50 71.5 5.11 NA 239.5 17.1 NA Table 43. ADC accuracy - limited test conditions(1) (2) 1. ADC DC accuracy values are measured after internal calibration. 2. 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 IINJ(PIN) in Section 5.3.12 does not affect the ADC accuracy. Symbol Parameter Test conditions Typ Max(3) 3. Based on characterization, not tested in production. Unit ET Total unadjusted error fPCLK2 = 28 MHz, fADC = 14 MHz, RAIN < 10 k, VDDA = 3 V to 3.6 V TA = 25 °C Measurements made after ADC calibration ±1.3 ±2 LSB EO Offset error ±1 ±1.5 EG Gain error ±0.5 ±1.5 ED Differential linearity error ±0.7 ±1 EL Integral linearity error ±0.8 ±1.5 R AIN T S f ADC C ADC 2 N2 + ln -------------------------------------------------------------- R ADC – |
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