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| 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 (fR) alternating with a low frequency (fL) 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 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 (TA=25) SYMBOL VC VC(ON-OFF) ICC TOPR TSTG CHARACTERISTIC Calling Voltage (f=50HZ) Continuous Calling Voltage (f=50HZ) 5 sec On/10 Sec Off Supply Current Operating Temperature Storage and Junction Temperature VALUE 120 200 22 -20~+70 -65~+150 UNIT VRMS VRMS 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 Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.com WS2418 Symbol VCC ICC VON VONR VSUS RD(OFF) VO(P-P) ISC TELEPHONE TONE RINGER WITH BRIDGE DIODE Characteristics Min. Typ. 1.5 12.2 8 8 6.4 VCC-3 35 DC ELECTRICAL CHARATERISTICS (TA=25) Max. 26 1.8 13 10 8.8 Units V mA V V V K V mA Test Conditions VCC=8.8 to 26V RA=1K Supply Voltage Current Consumption Without load Activation Voltage Activation Voltage Range Sustaining Voltage Different Resistance in OFF Condition Output Voltage Swing Short Circuit Current VCC=26V AC ELECTRICAL CHARACTERISTICS Symbol FH1 FH2 fH1R fS Characteristic Output Frequency Min. Typ. 2300+300 1700+300 Max. Units HZ Test Conditions VCC=26V, R1=14K VC=0V(PIN3) VC=6V(PIN3) R1=27K To 1.7K R1=14K,C1=100nF fH1 Range Sweep Frequency 0.1 8 15 KHz HZ TEST AND APPLICATION CIRCUIT TIP 1 F,250VAC 2.2K RA 0.22 F 10K C2 R2 8 6 5 10K TEL LINE C3 10 F VCC 7 1 2 WS2418 Piezo 3 4 VOUT 1300 :8 C1 100nF R1 12K RING 1.75.104 5 f , f = 1000 1.75. 800 f1= 3.22X , f2= 7 1 S C (nF ) R1 (K ) 1 DESCRIPTION The WS2418 tone ringer device its power supply by rectifying the AS ringing signal. It uses this power to activate two tone generators. The two tone frequencies generators 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 switch frequency can be externally adjusted The devices can driver either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using a loudspeaker, a transformer is need.4 An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, and high frequency oscillator. To protect the IC telephone line transients, a zener diode is include. WS2418 TELEPHONE TONE RINGER WITH BRIDGE DIODE PAD LOCATION 7 6 5 8 4 1 2 3 Chip size 2.4mm X 2.2mm Pad N 1 2 3 4 5 6 7 8 X (m) 315 660 1550 2065 2100 790 595 285 Y (m) 630 195 205 825 1710 1875 1875 1265 |
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