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STR730FZ1T6 Datasheet(PDF) 44 Page - STMicroelectronics |
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STR730FZ1T6 Datasheet(HTML) 44 Page - STMicroelectronics |
44 / 52 page Electrical parameters STR73xFxx 44/52 1. 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. The effect of negative injection current on robust pins is specified in Section 4.3.5. Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 4.3.5 does not affect the ADC accuracy. 2. Calibration is needed once after each power-up. Figure 21. ADC accuracy characteristics Figure 22. Typical application with ADC Table 27. ADC accuracy with fMCLK = 20 MHz, fADC=10 MHz, RAIN < 10 kΩ RAIN, VDDA=5 V. This assumes that the ADC is calibrated 2) Symbol Parameter Conditions Typ Max Unit |ET| Total unadjusted error 1) 1.0 2.0 LSB |EO| Offset error 1) 0.15 1.0 |EG| Gain error 1) 0.97 1.1 |ED| Differential linearity error1) 0.7 1.0 |EL| Integral linearity error 1) 0.76 1.5 EO EG 1LSBIDEAL 1LSB IDEAL V DDA V SSA – 1024 ----------------------------------------- = V (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. 1023 1022 1021 5 4 3 2 1 0 7 6 1 2 345 67 1021 1022 1023 1024 (1) (2) ET ED EL (3) VDDA VSSA AINx STR73X VDD IL ±1 μA VT 0.6V VT 0.6V CADC 3.5pF VAIN RAIN 10-Bit A/D conversion 2.3k Ω(max) CAIN |
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