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
Contek LS1240A monolithic integrated circuit, designed telephone ringer drive directly piezo-ceramic converter (buzzer). output current capacitity Contek LS1240A higher than Contek LS1240, driving dynamic loudspeaker Contek LS1240A needs only decoupling capacitor.
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
Contek LS1240A
Vout
100nF
27200 R1(k
f2=0.725f1
SWEEP
)=C1(nF)
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
LS1240A
ABSOLUTE MAXIMUM RATINGS (Ta=25
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
VALUE
+150
UNIT
Vrms Vrms
ELECTRICAL CHARACTERISTICS
(Ta=25 unless otherwise specified) Supply Voltage Current Consumption Without load Activation Voltage 1240 1240A Sustaining Voltage :1240 1240A Differential Resistance Condition Output Voltage Swing Short Circuit Current
PARAMETER
SYMBOL
TEST CONDITIONS
Vs=9.3
UNIT
VOFF Vout 1240 1240A Iout Vs=20V,RL=0 RL=250W Vs=26V,R1=14k V3=0V Vs=6V V3=0V Vs=6V
Vs-5
13.5 13.5
Operation Output Frequenies 1240 1240A Fout1/Fout2 Programming Resistor Range Sweep Frequency
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
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
LS1240A
CONFIGURATIONS
LINEAR INTEGRATED CIRCUIT
Contek
LINE GROUND
LINE RECTIFIER
SWEEP RATE CONTROL CAPACITOR OUTPUT FREQUENCY CONTROL RESISTOR
CAPACITOR
NULL BUZZER
APPLICATION CIRCUIT
2.2kW 2.2kW
LINE
BUZZER
Contek LS1240
Zload>1k
LINE
ContekLS1240A
RL=50W 1000W
100nF 14kW
100nF 14kW
current limitation provided output stage Contek LS1240A minimum load ohms adviced. tone frequencies generated switched internal oscillator fast sequence made audible across output amplifier loudspeaker, both tone frequencies switching frequency externally adjusted.The signal circuit designed that noise variations ringing signal cannot affect correct operation device.
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com

LINEAR INTEGRATED CIRCUIT ELECTRONIC TONE RINGER WITH BUILT-IN BR

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