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ST62T25BM1 Fiches technique(PDF) 90 Page - STMicroelectronics |
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ST62T25BM1 Fiches technique(HTML) 90 Page - STMicroelectronics |
90 / 105 page ST6215C ST6225C 90/105 8-BIT ADC CHARACTERISTICS (Cont’d) ADC Accuracy Notes: 1. Negative injection disturbs the analog performance of the device. In particular, it induces leakage currents throughout the device including the analog inputs. To avoid undesirable effects on the analog functions, care must be taken: - Analog input pins must have a negative injection less than 1mA (assuming that the impedance of the analog voltage is lower than the specified limits). - Pure digital pins must have a negative injection less than 1mA. In addition, it is recommended to inject the current as far as possible from the analog input pins. 2. Data based on characterization results over the whole temperature range, monitored in production. Figure 73. ADC Accuracy Characteristics Note: ADC not present on some devices. See device summary on page 1. Symbol Parameter Conditions Min Typ. Max Unit |ET| Total unadjusted error 1) VDD=5V 2) fOSC=8MHz 1.2 ±2, fosc>1.2MHz ±4, fosc>32KHz LSB EO Offset error 1) 0.72 EG Gain Error 1) -0.31 |ED| Differential linearity error 1) 0.54 |EL| Integral linearity error 1) EO EG 1LSBIDEAL 1LSB IDEAL V DDA V SSA – 256 ----------------------------------------- = Vin (LSBIDEAL) (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. Digital Result ADCDR 255 254 253 5 4 3 2 1 0 7 6 1 234567 253 254 255 256 (1) (2) ET ED EL (3) VDDA VSSA 1 |
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