LS1240AD1 STMicroelectronics, LS1240AD1 Datasheet - Page 2

• Manufacturer Part Number: LS1240AD1
• Description: IC RINGER ELECTRONIC 2TONE SO-8
• Manufacturer: STMicroelectronics

Specifications of LS1240AD1

• Function: Tone Ringer
• Number Of Circuits: 1
• Voltage - Supply: 26V
• Current - Supply: 30mA
• Operating Temperature: -40°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: SO-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Interface: -

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