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LTC6752 Datasheet(PDF) 24 Page - Analog Devices |
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LTC6752 Datasheet(HTML) 24 Page - Analog Devices |
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24 / 30 page  LTC6752/LTC6752-1/ LTC6752-2/LTC6752-3/ LTC6752-4 24 6752fc For more information www.linear.com/LTC6752 Typical applicaTions Common Mode Rejecting Line Receiver Differential electrical signals being transmitted over long cables are often attenuated. Electrical noise on the cables can take the form of common mode signals. The LTC6752 comparators can be used to retrieve attenu- ated differential signals that have been corrupted by high frequency common mode noise, as shown in Figure 14. Figure 15 shows an LTC6752-2 retrieving a 200MHz, 200mVP-Pdifferentialinputsignalthathas2.5Vofrandom, commonmodenoisesuperimposedonit. Theinputsupply (VCC) used was 5V and the output supply used was 2.7V. A small amount of modulation is seen at the output due to a small amount of differential modulation at the inputs, whichcausescycletocyclevariationsinpropagationdelay. Fast Event Capture The circuit shown in Figure 16 can be used to capture small and fast events. The comparator output is used to signal the latch pin and hold the output in the HIGH state. The circuit will reset when the RESET line is low. An open drain 1.5ns NAND gate is used to both invert the output signal and is used to MUX in the RESET line from the supervising circuit. One important feature of the NAND is that it is open drain which allows the comparator to use either its default 5mV of hysteresis or a user programmed hysteresis.Thelatchrecoverytimeofthiscircuitisroughly 210nsandisdominatedbythetimeconstantcreatedbythe capacitance seen at the output of the NAND gate and the 20k series resistance of the LE/HYST pin. The waveforms are shown in Figure 17. Figure 14 Figure 15 – + VCC = 5V VDD = 2.7V Q 6752 F14 SMALL DIFFERENTIAL SIGNAL WITH LARGE COMMON MODE COMPONENT VEE +IN –IN LTC6752-2 500mV/DIV –IN +IN Q 50ns/DIV 6752 F15 Figure 16 Figure 17 500mV/DIV 50ns/DIV 6752 F17 RESET INPUT REF OUT 3.3V 6752 F16 – + VCC LTC6752-2 VDD VEE LE/HYST SHDN Q 2.2F 0.1F 0.1F 200 182k EVENT IN 50mV, 10ns INPUT RESET 3.3V REF NXP 74LVC1G38 OUT |
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Similar Description - LTC6752 |
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