UTC LS1240A-S08-T Electronic tone ringer with built-in bridge rectifier Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LS1240A
LINEAR INTEGRATED CIRCUIT
ELECTRONIC TONE RINGER
WITH BUILT-IN BRIDGE
RECTIFIER
„
DESCRIPTION
The UTC LS1240A is monolithic integrated circuits and
designed to be as a telephone ringer. It can drive a piezo-ceramic
converter(buzzer) directly. The output current capacity of UTC
LS1240A is higher than standard ringer. For driving a dynamic
loudspeaker, UTC LS1240A needs only a decoupling capacitor to
replace the usual transformer in use.
„
FEATURES
* Low current consumption.
* Integrated rectifier bridge with zener diodes to overvoltage
Protection.
* Minimum external circuitry.
* Both frequencies of tone and switching are adjustable by external
components.
* Integrated voltage and current hysteresis.
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LS1240AL-D08-T
LS1240AG-D08-T
LS1240AL-S08-R
LS1240AG-S08-R
LS1240AL-S08-T
LS1240AG-S08-T
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
Package
Packing
DIP-8
SOP-8
SOP-8
Tube
Tape Reel
Tube
1 of 5
QW-R108-002.I
LS1240A
„
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
LINE
1
GND
2
8
LINE
7
Cr
UTC LS1240A
„
CSW
3
6
NULL
Ra
4
5
OUT
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
PIN NAME
LINE
GND
Csw
Ra
OUT
NULL
Cr
LINE
DESCRIPTION
Connecting pin to B-wire
Ground
Sweep rate control capacitor
Output frequency control resistor
Buzzer
Not connected
Rectifier capacitor
Connecting pin to A-wire
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 5
QW-R108-002.I
LS1240A
„
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
1
TELEPHONE
LINE
IN
8
IN
7
2
GND
3
SWEEP RATE
CONTROL CAPACITOR
SWITCHING
FREQUENCY
GENERATOR
THRESHOLD
CIRCUIT
WITH
HYSTERESIS
NONE
FREQUENCY
GENERATOR
4
OUTPUT FREQYENCY
CONTROL RESISTOR
„
RECTIFIER
BRIDGE
6
5
OUTPUT
STAGE
TELEPHONE
LINE
RECTIFIER
CAPACITOR
N.C.
BUZZER
TEST CIRCUIT
2.2k
1 F
8
VAB
7
5
UTC LS1240A
RL
Vout
10 F
1
3
2
4
C1
100nF
R1=
27200
f1
*(1-0.04 In
f1(Hz)
1943
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
)
R1
14k
f2=0.725f1
750
fSWEEP = C1(nF)
3 of 5
QW-R108-002.I
LS1240A
„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Calling Voltage (f=50Hz) Continuous
VABθ
120
VRMS
Calling Voltage (f=50Hz) (5s ON/10s OFF)
VAB
200
VRMS
Supply Current
IDC
30
mA
Operating Temperature
TOPR
-40 ~ +70
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
„
THERMAL DATA
PARAMETER
Junction to Ambient
„
SYMBOL
SOP-8
DIP-8
RATINGS
150
100
θJA
UNIT
℃/W
ELECTRICAL CHARACTERISTICS (TA= 25℃, unless otherwise specified)
PARAMETER
Supply Voltage
Current Consumption without load
Activation Voltage
Sustaining Voltage
Differential Resistance in OFF Condition
Output Voltage Swing
Short Circuit Current
AC OPERATION
Output Frequencies (Vs=26V,R1=14kΩ)
SYMBOL
VS
IB
VON
VOFF
RD
VOUT
IOUT
fOUT1
fOUT2
Fout1/Fout2
Programming Resistor Range
Sweep Frequency
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
MIN
VS=9.3 to 25V
TYP
1.5
12
7.8
6.4
VS-5
70
VS=20V, RL=250Ω
V3=0V
V3=6V
C1=100nF,R1=14kΩ
1.55
1.08
1.33
8
5.25
7.5
MAX UNIT
26
V
1.8
mA
13.5
V
9.3
V
kΩ
V
mA
2.53
1.9
1.43
56
9.75
kHz
kΩ
Hz
4 of 5
QW-R108-002.I
LS1240A
„
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
No current limitation is provided on the output stage of UTC LS1240A, so a minimum load DC of 50 ohms is
advised.
The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible
across an output amplifier in the loudspeaker, both tone frequencies and the switching frequency can be externally
adjusted. The signal and the circuit is designed so that noise on the line or variations of the ringing signal cannot
affect correct operation of the device.
U T C assum es no responsibility for equipm ent failures that result from using products at v alues that
ex ceed, ev en m om entarily, rated v alues (such as m ax im um ratings, operating condition ranges, or
other param eters) listed in products specifications of any and all U T C products described or contained
herein. U T C products are not designed for use in life support appliances, dev ices or system s where
m alfunction of these products can be reasonably ex pected to result in personal injury. R eproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. T he inform ation
presented in this docum ent does not form part of any quotation or contract, is believ ed to be accurate
and reliable and m ay be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 5
QW-R108-002.I
Similar pages