ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOWTHE PARALL

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ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOWTHE PARALL

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LS1240 LS1240A
ELECTRONIC TONE RINGER
CURRENT CONSUMPTION, ORDER ALLOWTHE PARALLELOPERATION 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 LS1240 LS1240A monolithic integrated circuits designed replace mechanical bell telephone sets connection with electro-acoustical converter. Both devices drive directly piezoceramic converter (buzzer). output current capability LS1240A higher than LS1240. driving dynamic loudspeaker LS1240 needs transformer, while LS1240A, needs decoupling capacitor. current limitation provided output stage LS1240A, minimum load adviced. tone frequencies generated switched internal oscillator fast sequenceand made audible across output amplifier loudspeaker, both tone frequencies switching frequency externally adjusted. CONNECTION (top view)
ORDERING NUMBERS
Minidip LS1240 LS1240A LS1240AD1
supply voltage obtainedfrom ring signal circuit designed that noise line variations ringing signal cannot affect correct operation device.
June 1993
LS1240/LS1240A
BLOCK DIAGRAM
Figure Test Circuit.
2.72 0.04 (Hz) 1943
0.725
fSWEEP
(nF)
LS1240/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 LS1240 LS1240A LS1240 LS1240A V8-1 12.2 LS1240 LS1240A Parameter Test Conditions Min. Typ. Max. 13.2 13.5 Unit
Differential Resistance Condition (pins 8-1) Output Voltage Swing Short Circuit Current (pins 5-2)
OPERATION Output Frequencies fout1 fout2 26V, 1.74 1.22 1.33 14k, 100nF 5.25 2.14 1.43 9.75
fOUT1
fOUT2 Programming Resistor Range fSWEEP Sweep Frequency
LS1240/LS1240A
Figure Typical Application LS1240 LS1240A
Figure Typical Application LS1240A only.
such that ZLOAD
LS1240/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 0260 0.200 0.150 0.060
DIP8.TBL
Typ. 3.32 0.020 0.045 0.014 0.008 Max. Min.
inch Typ. 0.131 Max.
0.065 0.022 0.012 0.430 0.384
PM-DIP8.EPS
LS1240/LS1240A
PACKAGE MECHANICAL DATA
DIM. Min. 1.27 3.81 1.27 (max.)
Typ. Max. 1.75 0.25 1.65 0.65 0.35 0.19 0.25 0.85 0.48 0.25 (typ.) 0.189 0.228
inch Min. Typ. Max. 0.069 0.004 0.010 0.065 0.026 0.014 0.007 0.010 0.033 0.019 0.010 0.020
0.197
SO8.TBL PM-SO8.EPS
0.244 0.050 0.150
0.150 0.016
0.157 0.050 0.024
LS1240/LS1240A
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights SGS-THOMSON Microelectronics. Specifications mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. SGS-THOMSON Microelectronics products authorized critical components life support devices systems without express written approval SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics Rights Reserved SGS-THOMSON Microelectronics GROUP COMPANIES Australia Brazil France Germany Hong Kong Italy Japan Korea Malaysia Malta Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thaliand United Kingdom U.S.A.

ELECTRONIC TONE RINGER CURRENT CONSUMPTION, ORDER ALLOWTHE PARALL

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