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LS1240 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
LS1240
ST-Microelectronics
STMicroelectronics ST-Microelectronics
LS1240 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Block diagram and test circuit
1
Block diagram and test circuit
Figure 1. LS1240 block diagram
Telephone
line
8
Rectifier
capacitor
7
N.C.
6
Rectifier
bridge
+
Threshold circuit
with hysteresis
-
Buzzer
5
Output
stage
LS1240
Switching
frequency
) generator
ct(s 1
du Telephone
ro line
2
GND
3
Sweep rate
control capacitor
te P Figure 2. Test circuit
Tone frequency
generator
4
Output frequency
control resistor
Obsolete Product(s) - Obsole R1
=
2.72 104
f1 (Hz)
(1
0.04
ln
19f143)
f2 = 0.725 f1
fSWEEP
=
750
C1 (nF)
2/9
 

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