WS2418
TELEPHONE TONE
RINGER WITH BRIDGE DIODE
8 DIP
The WS2418 is a monolithic integrated circuit telephone tone ringer with
bridge diode, when coupled with an appropriate transducer, it replaces the
electromechanical bell. This device is designed for use with either a piezo
transducer or an inexpensive transformer coupled speaker to produce a pleasing
tone composed of a high frequency (f
R
) alternating with a low frequency (f
L
)
resulting in a warble frequency. The supply voltage is obtained from the AC
ring signal and the circuit is designed so that noise on the line or variation of
the ringing signal cannot affect correct operating of the device.
FEATURES
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On chip high voltage full wave diode bridge rectifier
Low current consumption, in order to allow the parallel operation of the 4device
Low external component count
Tone and switching frequencies adjustable by external components
High noise immunity due to built-in voltage current hysteresis
Activation voltage adjustable
Internal zener diodes to protect against over voltages
Ringer impedance adjustable with external components
Electronic telephone ringers
Extension ringers
WS2418
BLOCK DIAGRAM
RECTIFIER
CAPACITOR
ACTIVATION
VOLTAGE ADJUSTABLE
7
TIP
6
8
POWER
SUPPLY
CONTROL
CIRCUIT
LOW
FREQ OSC
HIGH
FREQ OSC
OUTPUT
AMP
5
OUTPUT
RING
1
2
GND
3
4
SWEEP RATE
OUTPUT FREQUENCY
CONTROL CAPACITOR CONTROL RESISTOR
ABSOLUTE MAXIMUM RATINGS (T
A
=25鈩?
鈩?/div>
SYMBOL
V
C
V
C(ON-OFF)
I
CC
T
OPR
T
STG
CHARACTERISTIC
Calling Voltage (f=50H
Z
) Continuous
Calling Voltage (f=50H
Z
)
5 sec On/10 Sec Off
Supply Current
Operating Temperature
Storage and Junction Temperature
VALUE
120
200
22
-20~+70
-65~+150
UNIT
V
RMS
V
RMS
mA
鈩?/div>
鈩?/div>
Absolute maximum rating are those values beyond which permanent damage to the device may
occur. These are stress rating only and functional operation of the device at or beyond them is not
implied. Long exposure to these conditions may affect device reliability.
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage:
http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
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