LT1720CS8 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LT1720CS8

Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs

Linear Technology 

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APPLICATIONS INFORMATION

LT1720/LT1721

X

0.1µF

Y

51Ω*

R9

487Ω*

51Ω*

DELAY DETECTOR

5V

+

U1A

1/4 LT1721

–

R8*

4.53k

5V

301Ω*

R5

1.82k*

R6

301Ω*

301Ω*

C1

5.6pF

–

U1C

1/4 LT1721

+

–

U1B

1/4 LT1721

+

301Ω*

R7

261Ω*

OPTIONAL LOGARITHMIC PULSE STRETCHER (SEE TEXT)

5V

CAPTURE

Z

1N5711

R1

499Ω*

VIN

VC

C2

540pF

**

5V

0.33µF

+

U1D

1/4 LT1721

L

–

475Ω*

+

R2

R3

1k*

1Ω* VOFF

–

X 1V

0V

Y 1V

0V

Z 5V

0V

DELAY

R4

30Ω*

* 1% METAL FILM RESISTOR

** 270pF ×2 FOR REDUCED LEAD INDUCTANCE

1720/21 F12

RESULT OF X AND NOT Y

Figure 12. 3ns Delay Detector with Logarithmic Pulse Stretcher

X

Y

Z

Figure 13. Output Pulse Due to Delay of Y Input Pulse

17

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