Electronic Two-Tone Ringer CURRENT CONSUMPTION, ORDER ALLOW PARAL

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Electronic Two-Tone Ringer CURRENT CONSUMPTION, ORDER ALLOW PARAL

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LS1240A
Electronic Two-Tone Ringer
CURRENT CONSUMPTION, ORDER ALLOW PARALLEL OPERATION DEVICES INTEGRATED RECTIFIER BRIDGE WITH ZENER DIODES PROTECT AGAINST OVERVOLTAGES LITTLE EXTERNAL CIRCUITRY TONE SWITCHING FREQUENCIES ADJUSTABLE EXTERNAL COMPONENTS INTEGRATED VOLTAGE CURRENT HYSTERESIS
Minidip
DESCRIPTION LS1240A monolithic integrated circuit designed replace mechanical bell telephone sets connection with electro-acoustical converter. drive directly piezoceramic converter (buzzer)or dynamic loudspeaker. output current capability LS1240A higher than standard ringer. driving dynamic loudspeaker LS1240A simply decoupling capacitor, thus eliminating usual transformer. current limitation provided output stage LS1240A, minimum load adviced, series with proper capacitor. tone frequencies generated switched internal oscillator fast sequence made audible across output amplifier loudspeaker, both tone frequencies switching frequency externally adjusted. CONNECTION (top view)
ORDERING NUMBERS
Minidip LS1240A LS1240AD1
supply voltage obtained from ring signal circuit designed that noise line variations ringing signal cannot affect correct operation device.
Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.com
BLOCK DIAGRAM
LS1240A
Figure Test Circuit.
2.72 0.04 1943 (Hz)
0.725
fSWEEP
(nF)
ABSOLUTE MAXIMUM RATINGS
Symbol Tstg Parameter Calling Voltage Continuous Calling Voltage ON/10s Supply Current Operating Temperature Storage Junction Temperature Value
LS1240A
Unit Vrms Vrms
THERMAL DATA
Symbol j-amb Parameter Thermal Resistance Junction-ambient Value Unit °C/W
ELECTRICAL CHARACTERISTICS (Tamb applied between pins unless otherwise specified)
Symbol VOFF VOUT IOUT Supply Voltage Current Consumption without Load (pins 8-1) Activation Voltage Sustaining Voltage Differential Resistance Condition (pins 8-1) Output Voltage Swing Short Circuit Current (pins 5-2) V8-1
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
13.5
OPERATION Output Frequencies fout1 fout2 fOUT1 fOUT2 Programming Resistor Range fSWEEP Sweep Frequency 14k, 100nF 26V,
1.55 1.08 1.33
5.25
2.53 1.43
9.75
Figure Typical Application with BUZZER
LS1240A
Figure Typical Application with Loudspeaker transformer needed)
such that ZLOAD

Electronic Two-Tone Ringer CURRENT CONSUMPTION, ORDER ALLOW PARAL

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