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LS1240A 数据表(PDF) 2 Page - STMicroelectronics

部件名 LS1240A
功能描述  Electronic two-tone ringer
PDF  7 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LS1240A 数据表(HTML) 2 Page - STMicroelectronics

  LS1240A Datasheet HTML 1Page - STMicroelectronics LS1240A Datasheet HTML 2Page - STMicroelectronics LS1240A Datasheet HTML 3Page - STMicroelectronics LS1240A Datasheet HTML 4Page - STMicroelectronics LS1240A Datasheet HTML 5Page - STMicroelectronics LS1240A Datasheet HTML 6Page - STMicroelectronics LS1240A Datasheet HTML 7Page - STMicroelectronics  
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Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
Block diagram and test circuit
LS1240
2/9
1
Block diagram and test circuit
Figure 1.
LS1240 block diagram
Figure 2.
Test circuit
Rectifier
bridge
Threshold circuit
with hysteresis
Output
stage
Tone frequency
generator
Switching
generator
frequency
8
7
6
5
4
3
2
1
Telephone
line
Rectifier
capacitor
N.C.
Buzzer
Output frequency
control resistor
Sweep rate
control capacitor
GND
Telephone
line
+
-
R1
=
2.72
⋅ 10
4
f1
(Hz)
⋅ (1 − 0.04 ln
f1
1943)
f2 = 0.725 f1
fSWEEP
=
750
C1
(nF)



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