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
! 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
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS (T
A
=25℃)
SYMBOL CHARACTERISTIC VALUE UNIT
V
C
Calling Voltage (f=50H
Z
) Continuous 120 V
RMS
V
C(ON-OFF)
Calling Voltage (f=50H
Z
)
5 sec On/10 Sec Off
200 V
RMS
I
CC
Supply Current 22 mA
T
OPR
Operating Temperature -20~+70 ℃
T
STG
Storage and Junction Temperature -65~+150 ℃
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.
1
234
5
67
8
POWER
SUPPLY
CONTROL
CIRCUIT
LOW
FREQ OSC
HIGH
FREQ OSC
OUTPUT
AMP
RECTIFIER
CAPACITOR
ACTIVATION
VOLTAGE ADJUSTABLE
OUTPUT
OUTPUT FREQUENCY
CONTROL RESISTOR
SWEEP RATE
CONTROL CAPACITOR
GND
RING
TIP
Wing Shing Computer Components Co., (H.K.)Ltd. Tel:(852)2341 9276 Fax:(852)2797 8153
Homepage: http://www.wingshing.com E-mail: wsccltd@hkstar.com