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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ST7-STICK45 Datenblatt(PDF) 107 Page - STMicroelectronics |
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ST7-STICK45 Datenblatt(HTML) 107 Page - STMicroelectronics |
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107 / 124 page  ST7LITE0xY0, ST7LITESxY0 107/124 ADC CHARACTERISTICS (Cont’d) Figure 84. ADC Accuracy Characteristics with Amplifier disabled Figure 85. ADC Accuracy Characteristics with Amplifier enabled Note: When the AMPSEL bit in the ADCDRL register is set, it is mandatory that fADC be less than or equal to 2 MHz. (if fCPU=8MHz. then SPEED=0, SLOW=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 5 4 3 2 1 0 7 6 1 234567 253 254 255 256 (1) (2) ET ED EL (3) VDDA VSSA 253 EO EG 1LSBIDEAL 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. n =Amplifier Offset Digital Result ADCDR n+5 n+4 n+3 n+2 n+1 0 n+7 n+6 1 234567 100 101 102 103 (1) (2) ET ED EL (3) 250 mV VSS |
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