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LT1720IDD Datasheet(PDF) 28 Page - Linear Technology |
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LT1720IDD Datasheet(HTML) 28 Page - Linear Technology |
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28 / 28 page  LT1720/LT1721 28 17201fc Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1998 LT 0908 REV C • PRINTED IN USA RELATED PARTS TYPICAL APPLICATION PART NUMBER DESCRIPTION COMMENTS LT1016 UltraFast Precision Comparator Industry Standard 10ns Comparator LT1116 12ns Single Supply Ground-Sensing Comparator Single Supply Version of LT1016 LT1394 7ns, UltraFast, Single Supply Comparator 6mA Single Supply Comparator LT1671 60ns, Low Power, Single Supply Comparator 450μA Single Supply Comparator LT1715 4ns, 150MHz Dual Comparator Similar to the LT1720 with Independent Input/Output Supplies LT1719 4.5ns Single Supply 3V/5V Comparator Single Comparator Similar to the LT1720/LT1721 Pulse Stretcher For detecting short pulses from a single sensor, a pulse stretcher is often required. The circuit of Figure 20 acts as a one-shot, stretching the width of an incoming pulse to a consistent100ns.Unlikealogicone-shot,thisLT1720-based circuit requires only 100pV-s of stimulus to trigger. The circuit works as follows: Comparator C1 functions as a threshold detector, whereas comparator C2 is configured as a one-shot. The first comparator is prebiased with a threshold of 8mV to overcome comparator and system offsets and establish a low output in the absence of an input signal. An input pulse sends the output of C1 high, which in turn latches C2’s output high. The output of C2 is fed back to the input of the first comparator, causing regeneration and latching both outputs high. Timing capacitor C now begins charging through R and, at the end of 100ns, C2 resets low. The output of C1 also goes low, latching both outputs low. A new pulse at the input of C1 can now restart the process. Timing capacitor C can be increased without limit for longer output pulses. This circuit has an ultimate sensitivity of better than 14mV with 5ns to 10ns input pulses. It can even detect an avalanche generated test pulse of just 1ns duration with sensitivity better than 100mV.6 It can detect short events better than the coincidence detector of Figure 14 because the one-shot is configured to catch just 100mV of upward movement from C1’s VOL,whereasthecoincidence detector’s 3ns specification is based on a full, legitimate logic high, without the help of a regenerative one-shot. 6 See Linear Technology Application Note 47, Appendix B. This circuit can detect the output of the pulse generator described after 40dB attenuation. PULSE SOURCE C1 1/2 LT1720 C2 1/2 LT1720 50Ω 51Ω 6.8k 1N5711 24Ω 15k R 1k 2k 2k 17201 F20 2k C 100pF 0.01μF OUTPUT 100ns 5V Figure 20. A 1ns Pulse Stretcher |
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