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LTC6752-2 Datasheet(PDF) 23 Page - Linear Technology |
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LTC6752-2 Datasheet(HTML) 23 Page - Linear Technology |
23 / 30 page ![]() LTC6752/LTC6752-1/ LTC6752-2/LTC6752-3/ LTC6752-4 23 6752fc For more information www.linear.com/LTC6752 Typical applicaTions COMPARATOR U2 TIMING RESISTOR R TIMING CAPACITOR C 3.3V 100pF 2k 22k – + 6.65k 22k VCC 3.3V COMPARATOR U1 3.3V 15k OUTPUT 3.3V 100ns PULSE – + VCC LTC6752-2 INPUT 15mV TO 3.3V PULSE MINIMUM PULSE WIDTH 5ns VDD VEE LE/HYST SHDN OUT 49.9 1000pF 1k SOD-123 OSA 49.9 ZOUT = 50 LTC6752-2 VDD VEE LE/HYST SHDN OUT Figure 11 Figure 12 Figure 13 500mV/DIV IN– IN+ OUT 0 0.5 1.0 1.5 2.0 2.5 4.0 3.5 3.0 4.5 5.0 10ns/DIV 90 80 70 60 50 40 30 20 10 0 6752 F11 OUTPUT, 2V/DIV INPUT, 20mV/DIV 20ns/DIV 6752 F13 Pulse Stretcher Circuit/Monostable Multivibrator For detecting short pulses from a single sensor, a pulse stretcher is often required. The circuit of Figure 12 acts as a one-shot, stretching the width of an incoming pulse to a consistent~100ns.Thecircuitworksasfollows:Compara- tor U1 functions as a threshold detector, and Comparator U2 functions as a one-shot. Comparator U1 is biased with a threshold of 11mV to overcome comparator and system offsets, and establish a low output in the absence of an input signal. An input pulse causes the output of U1 to go high, which then causes the output of U2 to go high. The output of U2 is fed back to the input of the 1st compara- tor, Timing Capacitor C now begins charging through R. After 100ns, U2 goes low, allowing U1 also to go low. A new pulse at the input of U2 can now restart the process. Timing capacitor C can be increased without limit for longer output pulses. Figure 13 shows input and output waveforms for the pulse stretcher circuit. |
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