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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F407IG датащи(PDF) 120 Page - STMicroelectronics |
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STM32F407IG датащи(HTML) 120 Page - STMicroelectronics |
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120 / 167 page  Electrical characteristics STM32F405xx, STM32F407xx 120/167 Doc ID 022152 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. N = 12 (from 12-bit resolution) and k is the number of sampling periods defined in the ADC_SMPR1 register. a Note: ADC accuracy vs. negative injection current: Injecting a 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 currents. Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 5.3.16 does not affect the ADC accuracy. Table 66. ADC accuracy at fADC = 30 MHz (1) 1. Better performance could be achieved in restricted VDD, frequency and temperature ranges. Symbol Parameter Test conditions Typ Max(2) 2. Based on characterization, not tested in production. Unit ET Total unadjusted error fPCLK2 = 60 MHz, fADC = 30 MHz, RAIN < 10 kΩ, VDDA = 1.8 (3) to 3.6 V 3. If an inverted reset signal is applied to PDR_ON, this value can be lowered to 1.7 V when the device operates in a reduced temperature range (0 to 70 °C). ±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 R AIN k0.5 – () f ADC C ADC 2 N 2 + () ln × × -------------------------------------------------------------- R ADC – = |
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