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LTC6752-2 Datasheet(PDF) 23 Page - Linear Technology

Part # LTC6752-2
Description  280MHz, 2.9ns Comparator Family with Rail-to-Rail Inputs and CMOS Outputs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC6752-2 Datasheet(HTML) 23 Page - Linear Technology

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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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