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ST7L05 Datasheet(PDF) 93 Page - STMicroelectronics |
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ST7L05 Datasheet(HTML) 93 Page - STMicroelectronics |
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93 / 104 page  ST7L05, ST7L09 93/104 ADC CHARACTERISTICS (Cont’d) TA = -40 to +105°C unless otherwise specified Table 20. ADC Accuracy with 3.0V ≤ V DD ≤ 3.6V Table 21. ADC Accuracy with 4.5V ≤ V DD ≤ 5.5V Notes: 1. Data based on characterization results over the whole temperature range, monitored in production. 2. ADC accuracy versus negative injection current: Injecting negative current on any of the analog input pins may reduce the accuracy of the conversion being performed on another analog input. The effect of negative injection current on robust pins is specified in Section 13.11 on page 91. Any positive injection cur- rent within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.8 does not affect the ADC accuracy. 3. Data based on characterization results, monitored in production to guarantee 99.73% within ± max value from -40° to +105°C (± 3 σ distribution limits). Figure 71. ADC Accuracy Characteristics Symbol Parameter Conditions Typ Max3) Unit | ET | Total unadjusted error fCPU = 4 MHz, fADC = 2 MHz 1)2) 0.7 1.8 LSB | EO | Offset error 0.3 0.9 | EG | Gain error 0.4 1.4 | ED | Differential linearity error 0.5 0.8 | EL | Integral linearity error 0.4 0.8 Symbol Parameter Conditions Typ Max3) Unit | ET | Total unadjusted error fCPU = 8 MHz, fADC = 4 MHz 1)2) 0.9 2.1 LSB | EO | Offset error 0.3 0.9 | EG | Gain error 0.6 1.5 | ED | Differential linearity error 0.5 0.9 | EL | Integral linearity error 0.5 0.8 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 5 4 3 2 1 0 7 6 1 2 345 67 253 254 255 256 (1) (2) ET ED EL (3) VDDA VSSA 253 1 |
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