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Through pin 8 it is possible to programtheduty cycle
of the alarm signal waveform (see figure 2). When
pin 8is hightheoutputsignalhasa dutycycle of50%
; if pin 8 is low the duty cycle is l : 64.The period of
the outputsignalis always 320ms using the compo-
nent values indicated in block diagram.
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l
		Gc

	j7

j			-
- VDD = 3V fRFl = 885MHz - fRF2 = 885.1MHz
fLO = 755MHz I

LS1240AD datasheet

Note l. IE, VEC, trr, Orr, die/dt represent characteristics of the anti-parallel, emitter to collector free-wheel diode. (FWDi)
2. Pulse width and repetition rate should be such that the device junction temp. (Ti) does not exceed Tjmax rating.
3. Junction temperature (Ti) should not increase beyond 150YC.
4. Pulse width and repetition rate should be such as to cause negligible temperature rise.
*1 : Te measured point is indicated in OUTLINE DRAWING.
*2 : Typical value is measured by using Shin-etsu Silicone "G-746".
*3 : If you use this value, Rth(f-a; should be measured just under the chips.
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Dimensions	Inches	Mimeters
A	5.12	130.0
B	4.33+0.01	110.0+0.25
c	1.840	46.75
D	1.73+0.04/-0.02	44.0+1.0/-0.5
E	1.46+0.04/-0.02	37.0+1.0/-0.5
F	1.42	36O
G	1.25	31.8
H	1.18	30.0
J	1.10	28O
K	1.08	27.5

LS1240AD pdf

Ref. : DSCHA2066RBF2317 -13-Nov.-02 3/8 Specifications subject to change without notice