TS2418CD

TS2418 Telephone tone ringer with bridge diode Supply Voltage 26V (max.) Calling Voltage (f=50Hz) Continuous General Description The TS2418 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 can not affect correct operation 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 4 devices. 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. Ordering Information Part No. TS2418CD TS2418CS Operating Temp. o -20 ~ +70 C Package DIP-8 SOP-8 Block Diagram TS2418 1-4 2004/09 rev. A Absolute Maximum Rating Description Calling Voltage (f=50Hz) Continuous Calling Voltage (f=50Hz) 5 Sec ON/10 Sec OFF Supply Current Operating Temperature Storage and Junction Temperature Symbol VTP VTP ICC TOP Tstg Value 120 200 22 -20~+70 -65~+150 Unit Vrms Vrms mA 0 0 C C Note: *Maximum Rating are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. Recommended Operating Conditions Description Supply Voltage Symbol VCC Min -- Max 26 Unit V 0 -20 +70 Operating Temperature TA C Note: This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND≦(VIN or VOUT)≦VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC ). Unused output must be left open. Electrical Characteristics (Ta=25 C unless otherwise specified) 0 Parameter Supply Voltage Current Consumption without Load Activation Voltage Activation Voltage Range Sustaining Voltage Differential Resistance in Off Condition Output Voltage Swing Short Circuit Current Symbol VCC ICC VON VONR VSUS RD VOUT IOUT Test Conditions Vs = 8.8 to 26V Min --12.2 Typ -1.5 ----VCC-3 35 Max 26 1.8 13 10 8.8 ---- Unit V mA V V V KΩ V mA RA=1KΩ 8.0 8.0 6.4 -- Vs=26V -- AC Operation Output Frequency fH1 fH2 fH1 Range Sweep Frequency fL fH1 fH2 VCC =26V,R1=14KΩ VCC =0V VCC =6V R1=27KΩ to 1.7 KΩ R1=14KΩ,C1=100nF 0.1 -2300 1700 -10 15 -Hz Hz KHz Hz TS2418 2-4 2004/09 rev. A Test and Application Circuit . Description: The TS2418 tone ringer derives its power supply by rectifying the AC ringing signal. It uses this power to activate two tone generators. The two tone frequencies generated are switched by internal oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker; both tone frequencies and the switching frequency can be externally adjusted. The device can drive either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using a loud-speaker, a transformer is needed. An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, and high f frequency oscillator. To protect the IC from telephone line transients, a zener Diode is included. TS2418 3-4 2004/09 rev. A SOP-8 Mechanical Drawing A DIM SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27 (typ) 0.05 (typ) 0.10 0.25 0.004 0.009 0o 7o 0o 7o 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019 16 9 B P 1 8 G C D K M R F A B C D F G K M P R DIP-8 Mechanical Drawing A DIP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 9.07 9.32 0.357 0.367 6.22 6.48 0.245 0.255 3.18 4.45 0.125 0.135 0.35 0.55 0.019 0.020 2.54 (typ) 0.10 (typ) 0.29 0.31 0.011 0.012 3.25 3.35 0.128 0.132 7.75 8.00 0.305 0.315 10o 10o 8 5 DIM B 1 4 L C K G D M J A B C D G J K L M TS2418 4-4 2004/09 rev. A