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AD8564 датащи(PDF) 10 Page - Analog Devices |
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AD8564 датащи(HTML) 10 Page - Analog Devices |
10 / 12 page AD8564 Rev. B | Page 10 of 12 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 desirable for the output to toggle between states when the input signal is near the switching threshold. Figure 17 shows a method for configuring the AD8564 with hysteresis. COMPARATOR SIGNAL R1 R2 VREF CF Figure 17. Configuring the AD8564 with Hysteresis The input signal is connected directly to the inverting input of the comparator. The output is fed back to the noninverting input through R2 and R1. The ratio of R1 to R1 + R2 and the output swing establishes the width of the hysteresis window, with VREF setting the center of the window or the average switching voltage. The output switches high when the input voltage is greater than VHI and does not switch low again until the input voltage is less than VLO, as given in Equation 2. ( ) REF REF HI V R2 R1 R1 V V V + − − = + 1 (1) ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + − = R2 R1 R1 V V REF LO 1 (2) where V+ is the positive supply voltage. The CF capacitor may 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 R2 C f F P π = 2 1 , the hysteresis window approaches VHI = V+ – 1 V and VLO = 0 V. At frequencies less than fP, the threshold voltages remain as it is in Equation 1. |
Аналогичный номер детали - AD8564 |
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Аналогичное описание - AD8564 |
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