LS1240AD1013TR STMicroelectronics, LS1240AD1013TR Datasheet - Page 2

• Manufacturer Part Number: LS1240AD1013TR
• Description: Telephone Ringers Two-Tone Ringer
• Manufacturer: STMicroelectronics
• Type: Telecom IC'sr

Specifications of LS1240AD1013TR

• Function: Telecom Ringer
• Mounting Style: SMD/SMT
• Product: Telecom Ringer
• Package / Case: SOIC-8
• Frequency: 1740 Hz to 2140 Hz, 1220 Hz
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage (max): 26V
• Operating Temperature (max): 70C
• Pin Count: 8
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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