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LT1720 Datasheet(PDF) 28 Page - Linear Technology |
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LT1720 Datasheet(HTML) 28 Page - Linear Technology |
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28 / 28 page  28 LT1720/LT1721 17201f LT/TP 1099 4K • PRINTED IN USA ©LINEAR TECHNOLOGY CORPORATION 1998 TYPICAL APPLICATION Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com 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 450 µA Single Supply Comparator LT1719 4.5ns Single Supply 3V/5V Comparator Single Comparator Similar to the LT1720/LT1721 RELATED PARTS Figure 20. A 1ns Pulse Stretcher 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 consistent 100ns. Unlike a logic one-shot, this LT1720- 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 config- ured 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, whereas the coincidence 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 50 Ω 51 Ω 6.8k 1N5711 24 Ω 15k R 1k 2k 2k 1720/21 F20 2k C 100pF 0.01 µF OUTPUT 100ns 5V |
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