Description

The MX118 is a full-duplex frequency inversion scram bler that secures cordless telephone conversations. The two audio paths, C1 and C2, are identical and independent. Each consists of the following:

1) A 10th order lowpass filter cut off at 3.1 kHz.

2) A balanced modulator with high baseband and carrier rejection.

3) A 3.3 kHz inversion carrier (injection tone).

4) A 14th order bandpass filter (300-3000 Hz).

5) Input op-amps with externally adjustable gain.

Features

● Full-Duplex Audio Processing

● On-Chip “Brick-wall” Filters (300-3000 Hz)

● Low Voltage CMOS

● High Baseband and Carrier Rejection

● Excellent Audio Quality

● ECPA* Qualified Voice Protection

Applications

● Cordless Telephones & Wireless PBXs

● Battery Powered Portability