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LTC1445CN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1445CN Datasheet(HTML) 9 Page - Linear Technology |
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9 / 14 page  LTC1443/LTC1444/LTC1445 9 144345fe applicaTions inForMaTion Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on the V+ or the reference output voltage. Figure 3 shows the bypassed reference output with a square wave applied to the V+ pin. Resistors R1 and R2 set 10mV of hysteresis, while R3 damps the reference response. Note that the comparator output doesn’t trip. Hysteresis Hysteresis can be added to the LTC1444/LTC1445 by con- necting a resistor (R1) between the REF and HYST pins, and a second resistor (R2) from HYST to V– (Figure 4). Thedifferencebetweentheupperandlowerthresholdvolt- ages or hysteresis voltage band (VHB) is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the lower threshold decreases. The maximum voltage allowed between REF and HYST is 50mV, producing a maximum hysteresis voltage band of 100mV. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1µA to 5µA. If 2.4M is chosen for R2, then R1(kΩ) = VHB (mV). IN A+ 5 OUT V+ R1 10k R3 430 R2 2.4M C1 1.0µF IN A– HYST REF 4 14 8 5V TO 8V 144345 F03a LTC1445 3 9 2 – + 1.2V +– V– Figure 3a. V+ Glitching Test Circuit Figure 3b. V+ Glitching Response Figure 4. Programmable Hysteresis 8 R2 HYST REF 14 R1 144345 F04 LTC1445 9 IREF R1 = VHB (2)(IREF) R2 = IREF VHB 2 ( ) 1.221V – V+ 8V 5V VREF 144345 F03b OUT 2ms/DIV |
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Similar Description - LTC1445CN |
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