LS1240AL [UTC]
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER;
| 型号： | LS1240AL |
| 厂家： | 
Unisonic Technologies |
| 描述： | ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER |
| 文件： | 总5页 (文件大小：224K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LS1240A
LINEAR INTEGRATED CIRCUIT
ELECTRONIC TONE RINGER
WITH BUILT-IN BRIDGE
RECTIFIER
SOP-8
ꢀ 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.
DIP-8
ꢀ FEATURES
* Low current consumption.
* Integrated rectifier bridge with zener diodes to overvoltage
Protection.
*Pb-free plating product number: LS1240AL
* Minimum external circuitry.
* Both frequencies of tone and switching are adjustable by external
components.
* Integrated voltage and current hysteresis.
ꢀ ORDERING INFORMATION
Ordering Number
Package
Packing
Normal
Lead Free Plating
LS1240AL-D08-T
LS1240AL-S08-R
LS1240AL-S08-T
LS1240A-D08-T
LS1240A-S08-R
LS1240A-S08-T
DIP-8
SOP-8
SOP-8
Tube
Tape Reel
Tube
LS1240AL-D08-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) D08: DIP-8, S08: SOP-8
(3) Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R108-002,H
LS1240A
LINEAR INTEGRATED CIRCUIT
ꢀ
PIN CONFIGURATION
LINE
GND
LINE
1
2
3
4
8
7
6
5
Cr
UTC LS1240A
NULL
C
SW
Ra
OUT
ꢀ
PIN DESCRIPTION
PIN PIN NAME
DESCRIPTION
1
2
3
4
5
6
7
8
LINE
GND
Csw
Ra
Connecting pin to B-wire
Ground
Sweep rate control capacitor
Output frequency control resistor
Buzzer
OUT
NULL
Cr
Not connected
Rectifier capacitor
Connecting pin to A-wire
LINE
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LS1240A
LINEAR INTEGRATED CIRCUIT
ꢀ
BLOCK DIAGRAM
8
TELEPHONE
LINE
1
RECTIFIER
BRIDGE
TELEPHONE
LINE
IN
IN
7
2
3
RECTIFIER
CAPACITOR
GND
SWITCHING
FREQUENCY
GENERATOR
THRESHOLD
CIRCUIT
SWEEP RATE
CONTROL CAPACITOR
6
N.C.
WITH
HYSTERESIS
NONE
FREQUENCY
GENERATOR
4
5
OUTPUT
STAGE
BUZZER
OUTPUT FREQYENCY
CONTROL RESISTOR
ꢀ
TEST CIRCUIT
2.2kΩ
1 µF
8
5
VAB
Vout
7
RL
UTC LS 1240A
10 µF
1
2
3
4
R1
14kΩ
C1
100nF
27200
f1(Hz)
f1
1943
750
R1=
*(1-0.04 In
)
f2=0.725f1
fSWEEP
=
C1(nF)
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LS1240A
LINEAR INTEGRATED CIRCUIT
ꢀ ABSOLUTE MAXIUM RATINGS
PARAMETER
Calling Voltage (f=50Hz) Continuous
Calling Voltage (f=50Hz) (5s ON/10s OFF)
Supply Current
SYMBOL
RATINGS
120
UNIT
Vrms
Vrms
mA
VAB
θ
VAB
IDC
200
30
Operating Temperature
TOPR
TSTG
-40 ~ +70
-65 ~ +150
°C
°C
Storage Temperature
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.
ꢀ ELECTRICAL CHARACTERISTICS (Ta= 25℃, unless otherwise specified)
PARAMETER
SYMBOL
VS
TEST CONDITIONS
MIN TYP MAX UNIT
Supply Voltage
26
1.8
V
mA
V
Current Consumption without load
Activation Voltage
IB
VS=9.3 to 25V
1.5
VON
VOFF
RD
12
7.8
6.4
13.5
9.3
Sustaining Voltage
V
Differential Resistance in OFF Condition
Output Voltage Swing
kΩ
V
VOUT
IOUT
VS-5
70
Short Circuit Current
VS=20V, RL=250Ω
mA
AC Operation
fOUT1
fOUT2
V3=0V
V3=6V
1.55
1.08
1.33
8
2.53
1.9
Output Frequencies (Vs=26V,R1=14kΩ)
kHz
Fout1/Fout2
1.43
56
Programming Resistor Range
Sweep Frequency
kΩ
Hz
C1=100nF,R1=14kΩ
5.25 7.5 9.75
ꢀ THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
℃/W
SOP-8
DIP-8
150
100
Thermal Resistance Junction to Ambient
θJA
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LS1240A
LINEAR INTEGRATED CIRCUIT
ꢀ TYPICAL APPLICATION CIRCUIT
1 µF
2.2kΩ
8
5
CL
LINE
7
UTC LS1240A
RL=50Ω to
1000Ω
10 µF
1
2
3
4
R1
14kΩ
C1
100nF
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.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as m aximum ratings, operating condition ranges, or
other param eters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
m alfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The inform ation
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
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QW-R108-002,H
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