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AD8598ARU 数据表(PDF) 8 Page - Analog Devices |
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AD8598ARU 数据表(HTML) 8 Page - Analog Devices |
8 / 11 page AD8598 –8– REV. A The input bias current for the AD8598 is 3 µA. As with any PNP differential input stage, this bias current will go to zero on an input that is high and will double on an input that is low. Care should be taken in choosing resistor values to be con- nected to the inputs as large resistors could cause significant voltage drops due to the input bias current. The input capacitance for the AD8598 is typically 3 pF. This is measured by inserting a 5 k Ω source resistance to the input and measuring the change in propagation delay. Using Hysteresis Hysteresis can easily be added to a comparator through the addition of positive feedback. Adding hysteresis to a comparator offers an advantage in noisy environments where it is not desir- able for the output to toggle between states when the input signal is near the switching threshold. Figure 17 shows a method for configuring the AD8598 with hysteresis. VREF R1 SIGNAL COMPARATOR R2 CF Figure 17. Configuring the AD8598 with Hysteresis The input signal is directly connected to the noninverting input of the comparator. The output is fed back to the inverting input through R1 and R2. The ratio of R1 to R1 + R2 establishes the width of the hysteresis window with VREF setting the center of the window, or the average switching voltage. The Q output will switch high when the input voltage is greater than VHI and will not switch low again until the input voltage is less than VLO as given in Equation 1: V HI = V + –1–V REF () R1 R1 + R2 +V REF V LO =V REF 1– R1 R1 + R2 (1) where V+ is the positive supply voltage. The capacitor, CF, can also be added to introduce a pole into the feedback network. This has the effect of increasing the amount of hysteresis at high frequencies. This can be useful when comparing a relatively slow signal in a high frequency noise environment. At frequencies greater than fP = 1 2 π C F R2 , the hysteresis window approaches VHI = V+ – 1 V and VLO = 0 V. At frequencies less than fP the threshold voltages remain as in Equation 1. |
类似零件编号 - AD8598ARU |
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类似说明 - AD8598ARU |
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