LINEAR INTEGRATED CIRCUIT ELECTRONIC TONE RINGER WITH BUILT-IN BR

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LINEAR INTEGRATED CIRCUIT ELECTRONIC TONE RINGER WITH BUILT-IN BR

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LS1240A
LINEAR INTEGRATED CIRCUIT
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
LS1240A monolithic integrated circuit, designed telephone ringer. drive directly piezo-ceramic converter (buzzer). output current capacity LS1240A higher than LS1240, driving dynamic loudspeaker, LS1240A needs only decoupling capacitor.
SOP-8
FEATURES
*Low current consumption, order allow parallel operation devices. *Integrated rectifier bridge with zener diodes protect against over voltage. *Little external circuitry. *Tone switching frequencies adjustable external components. *Integrated voltage current hysteresis.
DIP-8
TEST CIRCUIT
2.2k
LS1240A
Vout
100nF
27200 f1(Hz)
*(1-0.04
1943
f2=0.725f1
fSWEEP C1(nF)
UNISONIC TECHNOLOGIES
CO., LTD.
QW-R108-002,D
LS1240A
PARAMETER
Calling Voltage(f=50Hz) Continuous Calling Voltage(f=50Hz) ON/10s Supply Current Operating Temperature Storage Temperature Thermal Resistance Junction-Ambient
LINEAR INTEGRATED CIRCUIT
SYMBOL
Topr Tstg Rth-amb
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
VALUE
+150
UNIT
Vrms Vrms °C/W
ELECTRICAL CHARACTERISTICS
(Ta=25°C, unless otherwise specified)
PARAMETER
Supply Voltage Current Consumption Without load Activation Voltage 1240 1240A Sustaining Voltage :1240 1240A Differential Resistance Condition Output Voltage Swing Short Circuit Current 1240 1240A Operation Output Frequencies 1240 1240A Fout1/Fout2 Programming Resistor Range Sweep Frequency
SYMBOL
VOFF Vout Iout
TEST CONDITIONS
Vs=9.3
13.5 13.5
UNIT
Vs-5 Vs=20V, RL=250 Vs=26V,R1=14k V3=0V Vs=6V V3=0V Vs=6V
fout1 fout2 fout1 fout2
C1=100nF,R1=14k
1.65 1.15 1.55 1.08 1.33 5.25
2.53 2.53 1.43 9.75
UNISONIC TECHNOLOGIES
CO., LTD.
QW-R108-002,D
LS1240A
CONFIGURATIONS
LINEAR INTEGRATED CIRCUIT
LINE
LINE RECTIFIER
GROUND SWEEP RATE CONTROL CAPACITOR OUTPUT FREQUENCY CONTROL RESISTOR
CAPACITOR
NULL
BUZZER
APPLICATION CIRCUIT
2.2k 2.2k
BUZZER
LINE
LS1240
Zload>1k
LINE
LS1240A
RL=50 1000
100nF
100nF
current limitation provided output stage LS1240A, minimum load ohms advised. tone frequencies generated switched internal oscillator fast sequence made audible across output amplifier loudspeaker, both tone frequencies switching frequency externally adjusted. signal circuit designed that noise line variations ringing signal cannot affect correct operation device.
UNISONIC TECHNOLOGIES
CO., LTD.
QW-R108-002,D

LINEAR INTEGRATED CIRCUIT ELECTRONIC TONE RINGER WITH BUILT-IN BR

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