ISL1571

4. Product Description

FN6387 Rev.3.00

Page 10 of 14

Nov.7.19

4.7

PLC Modem Applications

The ISL1571 is designed as a line driver for PLC modems. It is capable of outputting 450mA of output current with

a typical supply voltage headroom of 1.3V. It can achieve -85dBc of distortion at low 7.1mA of supply current per

amplifier.

The average line power requirement for the PLC application is 13dBm (20mW) into a 100Ω line. The average line

voltage is 1.41VRMS. Using a differential drive configuration and transformer coupling with standard back

termination, a transformer ratio of 1:2 is selected. The circuit configuration is shown in Figure 23.

Figure 23. Circuit Configuration

-

+

-

+

TX1

1:2

12.5

12.5

750

750

250

Ω

AFE

100