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L3240
ELETRONIC TWO-TONE RINGER
.LOWCURRENTCONSUMPTI .I .LI .TONEANDSWI .I .COMPLEMENTARY
ON, IN ORDER TO ALLOW THE PARALLEL OPERATION OF 4 DEVICES NTEGRATED RECTIFIER BRIDGE WITH ZENER DIODES TO PROTECT AGAINST OVERVOLTAGES TTLE EXTERNAL CIRCUITRY TCHING FREQUENCIES ADJUSTABLE BY EXTERNAL COMPONENTS NTEGRATED VOLTAGE AND CURRENT HYSTERESIS OUTPUT CONFIGURATION
Minidip SO8
ORDERING NUMBERS : L3240B1 (Minidip) L3240D1 (SO8)
DESCRIPTION L3240 is a monolithic integrated circuit designed to replace the mechanical bell in telephone sets, in connectionwith an electro acoustical converter. The device can drive either directly a piezo ceramic converter (buzzer) or a small loudspeaker. In this case a transformer is needed. The two tone frequencies generated are switched by an internal oscillator in a fast sequenceand made audible across output amplifiers in the transducer ; both tone frequencies and the switching frequency can be externally adjusted. The supply voltage is obtained from the AC ring signal and the circuit is designed so that noise on the line or variations of the ringing signal cannot affect the correct operation of the devices. The output bridge configuration allows to use a high impedance transducer with acoustical results much better than in a single ended configuration. The two outputs can also be connected independently to different converters or actuators (acoustical, opto, logic).
June 1993
PIN CONNECTION ( top view)
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L3240
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol VAB VAB DC Top Tstg Parameter Calling Voltage (f = 50 Hz) Continuous Calling Voltage (f = 50 Hz) 5s N/10s OFF Supply Current Operating Temperature Storage and Junction Temperature Value 120 200 30 - 20, + 70 - 65, + 150 Unit VRMS VRMS mA o C o C
THERMAL DATA
Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max. Value 100 Unit
o
C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC ; VS = applied between pins 7-2 ;otherwise specified)
Symbol Vs IB VON VOFF RD VOUT IOUT Vs Parameter Supply Voltage Current Consumption Without Load (Pins 8-1) Activation Voltage Sustaining Voltage Differential Resistance in OFF Condition (Pins 8-1) Output Voltage Swing Short Circuit Current (pins 5-6) Voltage Drop between Pins 8-1 and Pins 7-2 Test Conditions V8-1 = 16.5 to 29.5 V 12 7.8 6.4 Vs = 20 V Vs - 5 35 3 Min. Typ. 1.5 Max. 26 1.8 13.5 9.3 Unit V mA V V k V mA V
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L3240
ELECTRICAL CHARACTERISTICS (Tamb = 25oC ; VS = applied between pins 7-2 ;otherwise specified) AC OPERATION
Symbol Parameter Output Frequencies Fout 1 Fout 2 Fout 1 Fout 2 Programming Resistor Range Sweep Frequency Test Conditions Vs = 26 V, R1 = 14 K Vs = 0 V Vs = 6 V Min. 2,29 1.6 1.33 8 5.25 Typ. Max. 2,8 2.1 1.43 56 9.75 k Hz Unit kHz
R1 = 14k, C1 =100nF
7,5
Figure 1 : Test Circuit.
Figure 2 : Typical Application with Balanced Output.
Figure 3 : Application Compatible with LS1240 (single ended output).
Figure 4 : F1 Out vs. R1.
4 R1 3.56 x 10 x (1 - 0.12 x ln F1 F1 (HZ) 2543
)
f2 = 0.725 f1
fSWEEP =
750 C1 (nF)
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L3240
MINIDIP PACKAGE MECHANICAL DATA
DIM Min. A a1 B b b1 D E e e3 e4 F i L Z 3.18 7.95 2.54 7.62 7.62 6.6 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 mm Typ. 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384
DIP8.TBL
inch Max. Min. Typ. 0.131 Max.
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L3240
SO8 PACKAGE MECHANICAL DATA
DIM Min. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 o (max.) 0.150 0.016 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197
SO8.TBL
inch Min. Typ. Max. 0.069 0.004 0.010 0.065 0.026 0.014 0.007 0.010
o
0.033 0.019 0.010 0.020
0.244
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L3240
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the conseque nces of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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