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TECHNICAL DATA
IN2418
Telephone Tone Ringer with Bridge Diode
The IN2418 is a monolithic integrated circuit telephone tone ringer with bridge diode, when coupled with an appropriate transducer, it replaces the electro-mechanical bell. The 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. * 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 IN2418N Plastic TA = -20 to 70 C for package
PIN ASSIGNMENT
BLOCK DIAGRAM
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IN2418
MAXIMUM RATINGS* (TA = 25C)
Symbol VTP VTP ICC Tstg
*
Parameter Calling Voltage (f = 50 Hz) Continuous Calling Voltage (f = 50 Hz) 5 Sec ON/10 Sec OFF Supply Current Storage and Junction Temperature
Value 120 200 22 -65 to +150
Unit Vrms Vrms mA C
Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol VCC TA Supply Voltage Operating Temperature -20 Parameter Min Max 26 +70 Unit V C
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 outputs must be left open.
ELECTRICAL CHARACTERISTICS(TA = 25C)
Guaranteed Limits Symbol ICC VON VONR VSUS RD VOUT IOUT Parameter Current Consumption without Load Activiation Voltage Activiation Voltage Range Sustaining Voltage Differential Resistance in Off Condition Output Voltage Swing Short Circuit Current VS = 26 V RA = 1 K Test Conditions Min VS=8.8 to 26 V 12.2 8 8 6.4 VCC-3 35 Typ Max 1.8 13 10 8.8 mA V V V K V mA Unit
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IN2418
AC CHARACTERISTICS
Guaranteed Limits Symbol Parameter Output Frequencies fH1 fH2 fH1 Range fL Sweep Frequency Test Conditions Min fH1 fH2 VCC = 26 V, R1 = 14 K VCC = 0 V VCC = 6 V R1 = 27 K to 1.7 K R1 = 14 K, C1 = 100 nF 0.1 10 Typ 2300 1700 15 Max Hz Hz KHz Hz Unit
TEST AND APPLICATION CIRCUIT
f1 = 3.22 *104 / R1 (K); f2 = 5/7 f1; fsweep = 1000 / C1(nF)
DESCRIPTION
The IN2418 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 frequency oscillator. To protect the IC from telephone line transients, a zener Diode is included.
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