Datasheet L3240D1, L3240B1 Datasheet (SGS Thomson Microelectronics)

ELETRONIC TWO-TONERINGER

.LOW CURRENT CONSUMPTION, IN ORDER

TOALLOWTHEPARALLELOPERATIONOF4
DEVICES

.INTEGRATED RECTIFIER BRIDGE WITH

ZENER DIODES TO PROTECT AGAINST
OVERVOLTAGES

.LITTLEEXTERNAL CIRCUITRY

.TONE AND SWITCHING FREQUENCIES AD-

JUSTABLEBY EXTERNAL COMPONENTS

.INTEGRATED VOLTAGE AND CURRENT

HYSTERESIS

.COMPLEMENTARY OUTPUT CONFIGURA-

TION

L3240

Minidip SO8

ORDERINGNUMBERS : L3240B1 (Minidip)

L3240D1 (SO8)

DESCRIP TION

L3240is a monolithicintegratedcircuit designedto
replace the mechanical bell in telephone sets, in
connectionwithanelectroacousticalconverter.The
devicecandriveeitherdirectlyapiezoceramiccon­verter(buzzer)or a smallloudspeaker.In this case
a transformerisneeded. The two tone frequencies
generatedareswitchedby aninternaloscillatorin a
fastsequenceandmade audibleacrossoutputam­plifiersinthe transducer;bothtonefrequenciesand
the switching frequencycan be externallyadjusted.

ThesupplyvoltageisobtainedfromtheAC ringsig­nal and the circuit is designedso that noise on the
lineor variationsof the ringingsignal cannot affect
the correct operationof the devices.

Theoutputbridgeconfigurationallows to usea high
impedancetransducerwithacousticalresultsmuch
betterthan in a single endedconfiguration.

The two outputs can also be connected inde­pendently to different converters or actua­tors (acoustical,opto,logic).

June1993

PIN CONNECTION ( top view)

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L3240

BLOCK DIAG RAM

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

AB

V

AB

DC Supply Current 30 mA
T

op

T

stg

Calling Voltage (f = 50 Hz) Continuous 120 V
Calling Voltage (f = 50 Hz) 5s N/10s OFF 200 V

Operating Temperature – 20, + 70
Storage and Junction Temperature – 65, + 150

o
o

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

Thermal Resistance Junction-ambient Max. 100

o

C/W

ELECTRICAL CHARACTERISTICS

=25oC;VS= applied between pins 7-2 ;otherwise specified)

(T

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

V

V

R

I

OUT

V

Supply Voltage 26 V

s

I

Current Consumption Without Load (Pins 8-1) V

B

Activation Voltage 12 13.5 V

ON

Sustaining Voltage 7.8 9.3 V

OFF

Differential Resistance in OFF Condition (Pins 8-1) 6.4 kΩ

D

Output Voltage Swing Vs–5 V

OUT

= 16.5 to 29.5 V 1.5 1.8 mA

8-1

Short Circuit Current (pins 5-6) Vs= 20 V 35 mA
Voltage Drop between Pins 8-1 and Pins 7-2 3 V

s

RMS
RMS

C
C

2/6

ELECTRICAL CHARACTERISTICS

=25oC;VS= applied between pins 7-2 ;otherwise specified)

(T

amb

AC OPERATION

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Frequencies
Fout 1
Fout 2

Fout 1
Fout 2

Programming Resistor Range 8 56 kΩ
Sweep Frequency R

=26V,R1=14KΩ

V

s

=0V

V

s

=6V

V

s

= 14kΩ, C1 =100nF 5.25 7,5 9.75 Hz

1

2,29

1.6

1.33 1.43

2,8

2.1

Figure 1 : Test Circuit. Figure2 :Typical Applicationwith Balanced

Output.

L3240

kHz

Figure 3 : ApplicationCompatiblewithLS1240

(singleendedoutput).

3.56 x 10

R1≈ x (1 – 0.12x ln )

F1(HZ) 2543

4

F

1

Figure4 :F

f

= 0.725f

2

1

1

Outvs. R1.

f

SWEEP

=

750

C1 (nF)

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L3240

MINIDIP PACKAGEMECHANICAL DATA

DIM

Min. Typ. Max. Min. Typ. Max.

A 3.32 0.131

a1 0.51 0.020

B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022

b1 0.204 0.304 0.008 0.012

D 10.92 0.430

E 7.95 9.75 0.313 0.384

e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300

F 6.6 0260

i 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060

mm inch

DIP8.TBL

4/6

SO8PACKAGE MECHANICAL DATA

L3240

DIM

mm inch

Min. Typ. Max. Min. Typ. Max.

A 1.75 0.069

a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033

b 0.35 0.48 0.014 0.019

b1 0.19 0.25 0.007 0.010

C 0.25 0.5 0.010 0.020

o

c1 45

(typ.)

D 4.8 5.0 0.189 0.197

E 5.8 6.2 0.228 0.244
e 1.27 0.050

e3 3.81 0.150

F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.016 0.050

M 0.6 0.024

o

S8

(max.)

SO8.TBL

5/6

L3240

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences 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.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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