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