SL2411

System Logic

Semiconductor

SLS

APPLICATION NOTE

The application circuit illustrates the use of the SL2411 devices in typical telephone or extension tone ringer

application.

The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenuated by

for the tone ringer chip.

The loudspeaker load is coupled through a 1300

Ω to 8Ω transformer.

Ω:8Ω) are not required.

However, a current limiting resistor is required.

device. As such, longer sucribser loops are possible since less voltage is dropped per unit length of loop wire

3) (higher impedance) to the line which can be used to alter the ringer equivalence number of a tone ringer circuit.

The graph in Fig2 illustrates the variation of supply current with supply voltage. Three curves are drawn to show

Ω) shows the I-V characteristic for the SL2411 tone

ringer.

Ω and shows an increase in the current drawn up to the initiation voltageV

Ω

initiation current decreases but again current after triggering is unchanged.