KA2418 Datasheet, PDF (1/3 Pages) Wing Shing Computer Components – TELEPHONE TONE RINGER WITH BRIDGE DIODE

WS2418
TELEPHONE TONE
RINGER WITH BRIDGE DIODE
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
8 DIP
WS2418
! 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
RECTIFIER
CAPACITOR
7
TIP ₈
POWER
SUPPLY
CONTROL
CIRCUIT
RING ₁
ACTIVATION
VOLTAGE ADJUSTABLE
6
LOW
FREQ OSC
HIGH
FREQ OSC
OUTPUT
AMP
5
OUTPUT
2
GND
3
4
SWEEP RATE
OUTPUT FREQUENCY
CONTROL CAPACITOR CONTROL RESISTOR
ABSOLUTE MAXIMUM RATINGS (T_A=25℃)
SYMBOL
CHARACTERISTIC
V_C
V_C(ON-OFF)
Calling Voltage (f=50H_Z) Continuous
Calling Voltage (f=50H_Z)
5 sec On/10 Sec Off
I_CC
Supply Current
T_OPR
Operating Temperature
T_STG
Storage and Junction Temperature
VALUE
120
200
22
-20~+70
-65~+150
UNIT
V_RMS
V_RMS
mA
℃
℃
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
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