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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LS1240
Electronic two-tone ringer
current consumption, order allow parallel operation devices Integrated rectifier bridge with zener diodes protect against over voltages little external circuitry Tone switching frequencies adjustable external components Integrated voltage current hysteresis Minidip
Description
LS1240 monolithic integrated circuit designed replace mechanical bell telephone sets connection with electro-acoustical converter. drive directly piezoceramic converter (buzzer) dynamic loudspeaker. output current capability LS1240 higher than standard ringer. drive dynamic loudspeaker LS1240 simply decoupling capacitor, thus eliminating usual transformer. current limitation provided output stage LS1240, minimum load advised, 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. supply voltage obtained from ring signal circuit designed that noise line variations ringing signal cannot affect correct operation device.
connection (top view)
August 2006
www.st.com
Block diagram test circuit
LS1240
Block diagram test circuit
Figure LS1240 block diagram
Telephone line Rectifier capacitor N.C. Buzzer
Rectifier bridge
Threshold circuit with hysteresis
Output
stage
Switching frequency generator
Tone frequency generator
Telephone line
Sweep rate control capacitor
Output frequency control resistor
Figure
Test circuit
2.72 0.04 1943 (Hz)
0.725
fSWEEP
(nF)
LS1240
Electrical characteristics
Electrical characteristics
Table
Symbol Tstg
Absolute maximum ratings
Parameter Calling voltage continuous Calling voltage ON/10s Supply current Operating temperature Storage junction temperature Value +150 Unit
Table
Symbol Rthj-amb
Thermal data
Parameter Maximum thermal resistance junction-ambient Value Unit °C/W
Tamb 25°C, applied between pins unless otherwise specified. Table
Symbol VOFF VOUT IOUT
Electrical characteristics
Parameter Supply voltage Current consumption without laod (pins 8-1) Activation voltage Sustaining voltage Differential resistance conditions (pins 8-1) Output voltage swing Short circuit current (pins 5-2) V8-1 12.2 VS-5 Test conditions Min. Typ. Max. 13.2 unit
operation Output frequencies fOUT1 fOUT2 26V,
1.74 1.22
2.14
OUT1 OUT2
Programming resistor range Sweep frequency
1.33
1.43
5.25
9.75
Application schematics
LS1240
Application schematics
Figure Typical application with buzzer
Figure
Typical application with loudspeaker transformer needed)
such that ZLOAD
LS1240
Package mechanical data
Package mechanical data
order meet environmental requirements, offers these devices ECOPACK® packages. These packages have Lead-free second level interconnect category second Level Interconnect ismarked package inner label, compliance with JEDEC Standard JESD97. maximum ratings related soldering conditions also marked inner label. ECOPACK trademark. ECOPACK specifications available www.st.com.
Package mechanical data Table
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 Typ. 3.32 0.020 0.045 0.014 0.008 Max. Min. Typ. 0.131
LS1240
Minidip package dimensions
inch Max.
0.065 0.022 0.012 0.430 0.384
0.260 0.200 0.150 0.060
Figure
Minidip package mechanicla drawing
LS1240 Table
Dim. Min. D(1) F(1) 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 0.50 0.026 0.014 0.007 0.010 (typ.) 0.189 0.228 0.004 Min.
Package mechanical data package dimensions
inch Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020
0.197 0.244 0.050 0.150 0.157 0.050 0.024
Figure
mechanical drawing
Ordering information
LS1240
Ordering information
Table Order codes
Part number LS1240A LS1240AD1 E-LS1240A
Package Minidip Minidip
E-LS1240AD1(1)
ECOPACK (see Chapter
Revision history
Table
Date 15-Jul-1998 23-Aug-2006
Document revision history
Revision Initial release. Updated document reflect fact that packages leadfree part numbers have changed. Changes
LS1240
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