TELEPHONE TONE RINGER WITH BRIDGE DIODE WS2418 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. 8 DIP WS2418 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 RECTIFIER CAPACITOR ACTIVATION VOLTAGE ADJUSTABLE 7 6 8 TIP 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 UNIT 120 200 VRMS VRMS 22 -20~+70 -65~+150 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: [email protected] TELEPHONE TONE RINGER WITH BRIDGE DIODE WS2418 DC ELECTRICAL CHARATERISTICS (TA=25℃ ℃) Symbol Characteristics VCC ICC VON VONR VSUS RD(OFF) Supply Voltage Current Consumption Without load Activation Voltage Activation Voltage Range Sustaining Voltage Different Resistance in OFF Condition Output Voltage Swing Short Circuit Current VO(P-P) ISC Min. Typ. Max. Units 26 1.8 13 10 8.8 V mA V V V KΩ 1.5 12.2 8 8 6.4 VCC-3 35 Test Conditions VCC=8.8 to 26V RA=1KΩ V mA VCC=26V AC ELECTRICAL CHARACTERISTICS Symbol Characteristic Min. Typ. Max. Units Output Frequency FH1 FH2 fH1R fS HZ 2300+300 1700+300 fH1 Range Sweep Frequency 0.1 15 KHz HZ 8 Test Conditions VCC=26V, R1=14KΩ VC=0V(PIN3) VC=6V(PIN3) R1=27KΩ To 1.7KΩ R1=14KΩ,C1=100nF TEST AND APPLICATION CIRCUIT TIP 1 F,250VAC C2 RA 2.2K 0.22 F R2 10K 8 TEL LINE 6 10K 5 WS2418 7 Piezo 1 C3 10 F VCC 2 3 4 C1 R1 100nF 12K VOUT RING 1.75. 1.75.104 , f = 5 f , f = 1000 800 f1= 3.22X 2 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. 1300 :8 TELEPHONE TONE RINGER WITH BRIDGE DIODE WS2418 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 (μ μm) 315 660 1550 2065 2100 790 595 285 Y (μ μm) 630 195 205 825 1710 1875 1875 1265