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The LB1005-TYPE device requires only two capacitors, one resistor, and an alerter to provide tone ringing functions from any standard Tip-Ring telephone pair. The device operates over widely varying ringing waveforms (i5 t0 68 Hz at 40 to 150 VrmsJ The LB1005-TYPE derives its power by rectifying the ac ringing signal from the Tip-Ring pair of a telephone loop. It uses this power to activate a tone generator. and then transfers most of this power to an alerter after the ringing has been detected. There is essentially no loading under non-ringing conditions. Selectable on-chip resistors allow the volume of the alerter output lo be adjusted (see Typical Application diagram). These devices do not have to depend upon power derived from the Tip-Ring inputs to become operational. Connecting an external voltage source to V+ will also allow the devices to operate in what is described as "stand alone applications." The tone generator circuitry includes an oscillator and frequency divider which produce specified tones and the tone modulation rate. The output warble frequency ranges and modulation rates are shown in Table l. This device is not intended to drive electromagnetic (EMR) type alerters directly without a coupling capacitor. In such applications, a suitable capacitor in the range of 0.oi to i.of should be inserted in serias with the alerter.
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