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LTC1440IN8 Datasheet(PDF) 12 Page - Linear Technology |
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LTC1440IN8 Datasheet(HTML) 12 Page - Linear Technology |
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12 / 16 page  12 LTC1440/LTC1441/LTC1442 144012fc APPLICATIONS INFORMATION 2. Calculate the required resistive divider ratio. Ratio = VREF/VIN Ratio = 1.182V/4.65V = 0.254 3. Choose the required hysteresis voltage band at the input VHBIN, in this example 60mV. Calculate the hyster- esis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.254) VHB = 15.24mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(k Ω) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. R V I V A M RR V V V REF BIAS IN REF HB 1 1 182 1 118 21 2 1 == = = + − ⎡ ⎣ ⎢ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ ⎥ . . µ RM V V mV RM 21 18 465 1 182 15 2 1 23 40 = + − ⎡ ⎣ ⎢ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ ⎥ = . . . . Low Voltage Operation The guaranteed minimum operating voltage is 2V or ( ±1V). As the total supply voltage is reduced below 2V, the performance degrades and the supply current falls. Both the reference and the comparator are still functioning with supply voltage down to 1.5V. The reference will have slightly worse temperature coefficient. While the com- parator would have less output drive and the propagation delay increases. The useful input voltage range extends from the negative supply to a little under 1V below the positive supply, which is slightly closer to the positive rail than the device operating from higher supply voltages. |
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