ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOW PARALLEL

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ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOW PARALLEL

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LS1240A
ELECTRONIC 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.
July 1998
LS1240A
BLOCK DIAGRAM
Figure Test Circuit.
2.72 0.04 1943 (Hz)
0.725
fSWEEP
(nF)
LS1240A
ABSOLUTE MAXIMUM RATINGS
Symbol Tstg Parameter Calling Voltage Continuous Calling Voltage ON/10s Supply Current Operating Temperature Storage Junction Temperature Value 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 12.2 Parameter Test Conditions Min. Typ. Max. 13.2 Unit
OPERATION Output Frequencies fout1 fout2 fOUT1 fOUT2 Programming Resistor Range fSWEEP Sweep Frequency 14k, 100nF 26V, 1.74 1.22 1.33 5.25 2.14 1.43 9.75
LS1240A
Figure Typical Application with BUZZER
Figure Typical Application with Loudspeaker transformer needed)
such that ZLOAD
LS1240A
MINIDIP PACKAGE MECHANICAL DATA
DIM. MIN. 3.18 7.95 2.54 7.62 7.62 5.08 3.81 1.52 0.125 0.51 1.15 0.356 0.204 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 0.060 TYP. 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 MAX. MIN. inch TYP. 0.131 MAX.
LS1240A
PACKAGE MECHANICAL DATA
DIM. MIN. 1.27 3.81 1.27 (max.) 0.15 0.016 0.65 0.35 0.19 0.25 TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020
LS1240A
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specification mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo registered trademark STMicroelectronics 1998 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Mexico Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A.

ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOW PARALLEL

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