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ST7263 数据表(PDF) 102 Page - STMicroelectronics |
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ST7263 数据表(HTML) 102 Page - STMicroelectronics |
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102 / 109 page  ST7263 102/109 7.9 8-BIT ADC CHARACTERISTICS *Note: ADC Accuracy vs. Negative Injection Current: For Iinj-=0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 1 LSB by 10K Ω increase of the external analog source impedance. These measurements results and recommandations are done in the worst condition of injection: - negative injection - injection to an Input with analog capability ,adjacent to the enabled Analog Input - at 5V VDD supply, and worse temperature case. OE GE 1 LSB(ideal) 1LSB i deal V DDA V SSA – 256 ----------------------------------------- = Vin (LSBideal) (1) Example of an actual transfer curve (2) The ideal transfer curve (3) End point correlation line TUE=Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves. OE=Offset Error: deviation between the first actual transition and the first ideal one. GE=Gain Error: deviation between the last ideal transition and the last actual one. DLE=Differential Linearity Error: maximum devia- tion between actual steps and the ideal one. ILE=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 6 123 456 7 253 254 255 256 (1) (2) TUE DLE ILE (3) VDDA VSSA ADC Analog to Digital Converter (8-bit) Symbol Parameter Conditions Min Typ Max Unit |TUE| Total unadjusted error* fADC=fCPU=4MHz VDD=VDDA=5V 2 LSB OE Offset error* -1 1 GE Gain Error* -2 2 |DLE| Differential linearity error* 1 |ILE| Integral linearity error* 2 VAIN Conversion range voltage VSSA VDDA V IADC A/D conversion supply current fADC=fCPU=4MHz VDD=VDDA=5V 1mA tSTAB Stabilization time after enable ADC 30 µs tLOAD Sample capacitor loading time 8 32 µs 1/fADC tCONV Hold conversion time 8 32 µs 1/fADC RAIN External input resistor 20 ΚΩ RADC Internal input resistor 18 ΚΩ CSAMPLE Sample capacitor 22 pF |
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