CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...
CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...
CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...
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Typical Performance CurvesADC0802, ADC0803, ADC0804LOGIC INPUT THRESHOLD VOLTAGE (V)1.8-55 o C TO 125 o C1.71.61.51.41.34.50 4.75 5.00 5.25 5.50V+ SUPPLY VOLTAGE (V)DELAY (ns)5004003002001000200 400 600 800 1000LOAD CAPACITANCE (pF)FIGURE 2. LOGIC INPUT THRESHOLD VOLTAGE vs SUPPLYVOLTAGEFIGURE 3. DELAY FROM FALLING EDGE OF RD TO OUTPUTDATA VALID vs LOAD CAPACITANCE3.51000CLK IN THRESHOLD VOLTAGE (V)<strong>3.1</strong>2.72.31.9V T(+)4.75 5.00 5.25 5.50-55 o C TO 125 o CV T(-)f CLK (kHz)R = 50KR = 20KR = 10K1.54.50V+ SUPPLY VOLTAGE (V)10010 1001000CLOCK CAPACITOR (pF)FIGURE 4. CLK IN SCHMITT TRIP LEVELS vs SUPPLY VOLTAGEFIGURE 5. f CLK vs CLOCK CAPACITORFULL SCALE ERROR (LSBs)76543210V+ = 5VV+ = 4.5VV+ = 6V0 400 800 1200 1600 2000f CLK (kHz)OFFSET ERROR (LSBs)161412108642V IN(+) = V IN(-) = 0VASSUMES V OS = 2mVTHIS SHOWS THE NEEDFOR A ZERO ADJUSTMENTIF THE SPAN IS REDUCED00.01 0.1 1.0 5V REF /2 (V)FIGURE 6. FULL SCALE ERROR vs f CLKFIGURE 7. EFFECT OF UNADJUSTED OFFSET ERROR6-10
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