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LTC6752 Datasheet(PDF) 22 Page - Analog Devices |
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LTC6752 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 30 page  LTC6752/LTC6752-1/ LTC6752-2/LTC6752-3/ LTC6752-4 22 6752fc For more information www.linear.com/LTC6752 Typical applicaTions High Speed Clock Restoration/Level Translation Circuit High speed comparators are often used in digital systems to recover distorted clock waveforms. The separate input/ output supplies feature of the LTC6752-2 allows it to be used in applications where signals need to be shifted from onevoltagedomaintoanother.Figure8showsacircuitthat can perform both recovery and level translation functions. In this application, the input clock signal comes from a source operating from 5V, and the signal is required to driveareceiveroperatingon1.8V.The5Vinputsupply/1.8V outputsupplyfeatureofthispartisidealforsuchasituation. If the input signal gets distorted and its amplitude severely reduced due to stray capacitance, stray inductance or due to reflections on the transmission line, the LTC6752-2 can be used to convert it into a full scale digital output signal that can drive the receiver. Figure 9 shows the input and output waveforms of the LTC6752-2,usedtorecoveradistorted150mVP-P200MHz signal at a common mode of 2.5V with respect to its nega- tivesupply,intoafullscale1.8Voutputsignal.AC-coupling could have been used at the input of the comparator, how- ever to preserve input duty cycle information DC-coupling may be preferable, and that is where having a wide input common mode range is an advantage. Optical Receiver Circuit The LTC6752, along with a high speed high performance FET input operational amplifier like the LTC6268, can be usedtoimplementanopticalreceiverasshowninFigure10. Figure 11 shows the output of the LTC6268 driving the –IN pin of the LTC6752-2, the +IN pin of the LTC6752-2, and the LTC6752-2 output. The photodiode is being driven by a light source of sinusoidally varying intensity. Figure 10. Optical Receiver Circuit Figure 9 VOUT, 500mV/DIV VIN, 50mV/DIV 2ns/DIV 6752 F09 VREF 3.3V 3.3V 3.3V 3.3V 5.49k 20k – + LTC6268 0V TO 3.3VOUT 1k 6752 F10 – + VCC LTC6752-2 VDD VEE LE/HYST SHDN Q 4.53k 0.1µF 0.1µF 47.6k FCI-125 1k Figure 8. High Speed Clock Restoration/Level Translation/Level Shifting Circuit – + VCC VDD VEE + 1.8V VEE VEE + 1.8V VEE + 5V 6752 F08 200MHz CLOCK SIGNAL ATTENUATED 150mVP-P 200MHz, VCM = 2.5V ~1.8VP-P 200MHz, CLOCK SIGNAL LONG TRACE VEE VREF = VEE + 2.5V CLOCK/DATA RECEIVER LTC6752-2 VEE CLOCK/DATA SOURCE |
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Similar Description - LTC6752 |
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