IL2418 ETC | Alldatasheet
Document overview
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Technical content
Telephone Tone Ringer with Bridge Diode The IL2418 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 (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 can not affect correct operation of the de vice.
- 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 IL2418
ORDERING INFORMATION
TA = -20° to 70° C for package PIN ASSIGNMENT BLOCK DIAGRAM
MAXIMUM RATINGS* (TA = 25°C) Symbol Parameter Value Unit VTP Calling Voltage (f = 50 Hz) Continuous 120 Vrms VTP Calling Voltage (f = 50 Hz) 5 Sec ON/10 Sec OFF 200 Vrms ICC Supply Current 22 mA Tstg Storage and Junction Temperature -65 to +150 °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 Parameter Min Max Unit VCC Supply Voltage 26 V TA Operating Temperature -20 +70 °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, V IN 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 V CC). Unused outputs must be left ope n. ELECTRICAL CHARACTERISTICS(TA = 25°C) Symbol Parameter Test Conditions Guaranteed Limits Unit Min Typ Max ICC Current Consumption without Load VS=8.8 to 26 V 1.8 mA VON Activiation Voltage 12.2 13 V VONR Activiation Voltage Range RA = 1 KΩ 8 10 V VSUS Sustaining Voltage 8 8.8 V RD Differential Resistance in Off Condition 6.4 KΩ VOUT Output Voltage Swing VCC-3 V IOUT Short Circuit Current VS = 26 V 35 mA
VCC = 26 V, R1 = 14 KΩ VCC = 0 V VCC = 6 V 2300 1700 Hz Hz fH1 Range R1 = 27 KΩ to 1.7 KΩ 0.1 15 KHz fL Sweep Frequency R1 = 14 KΩ , C1 = 100 nF 10 Hz TEST AND APPLICATION CIRCUIT RING TIP 1 F, 250VAC 2.2 K 10 F 0.22 F 100nF 12K 10K 10K Ra VOUT I2418LTEL LINE VS Piezo 1300:8 1 2 3 4 f1 = 3.22 • 104 / R1 (KΩ ); f2 = 5/7 f1; fsweep = 1000 / C1(nF)
DESCRIPTION
The IL2418 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 prot ect the IC from telephone line transients, a zener Diode is included.
Chip making (X=2,283, Y=0,165) 20 Size pad: 0.12 x 0.12 mm PAD LOCATION Pad No Symbol X Y 01 RING 0.220 0.590 02 GND 0.920 0.100 03 SPC 1.630 0.230 04 OFR 2.075 0.810 05 OUT 2.090 1.620 06 AVA 1.150 1.820 07 RC 0.519 1.890 08 TIP 0.220 1.310 Pad size is given as per metallization layer 2.43 + 0.03 2.20 + 0.03 06 05 (0,0) Chip marking