LM1872N National Semiconductor, LM1872N Datasheet - Page 17
LM1872N
Manufacturer Part Number
LM1872N
Description
IC RECEIVER RADIO CTRL 4CH
Manufacturer
National Semiconductor
Datasheet
1.LM1872N.pdf
(20 pages)
Specifications of LM1872N
Function
Receiver, Decoder
Frequency
27MHz, 49MHz, 72MHz
Package / Case
18-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM1872N
LM1872
LM1872
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM1872N
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MIT
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5 510
ure 14) The trailing edge of CH 1’s output pulse is used to
Applications
Where only one of the two available analog channels needs
conversion to a digital format the LM555 approach offers
simplicity combined with up to 150 mA of output drive (Fig-
reset the timer in preparation for comparing CH 2’s pulse
width to the time constant (1 1 ms) set by the internal 10k
resistor and C1 For CH 2 pulse widths greater than 1 1 ms
C1 ramps to threshold setting an internal latch in the
(Continued)
FIGURE 14 Simple Conversion of an Analog to a Digital Channel
FIGURE 13 Conversion of an Analog Channel
to a Digital (On Off) Channel
17
LM555 and causing the load to be energized Due to the
timing of the reset pulse however the LM555 output will go
high again for 1 1 ms during the next pulse comparison cy-
cle thus producing an ON state duty cycle of about 95%
For most commonly encountered loads such as motors so-
lenoids lamps and horns this is of little consequence The
OFF state duty cycle is 100%
TL H 7912 – 25
TL H 7912 – 26