Description
The FX118 is a low-power, full-duplex frequency inverter available to provide voice privacy for cordless telephone systems by mixing the incoming audio with an internally produced carrier frequency (3.3kHz).
This chip contains two completely separate audio channels (C1 and C2) each comprising a “component adjustable” input amplifier, a 10th-order lowpass filter, a balanced modulator and a 14th-order bandpass filter output

FEATUREs/Applications
Frequency Inversion Scrambling
Full-Duplex Operation
High Baseband and Carrier
Rejection
Audio Lowpass and Bandpass
Filtering On-Chip
Xtal Oscillator Stabilty
Low Power Requirement (3.0 Volt Minimum)
Cordless Telephones
Base and Handheld Applications
Input Gain Adjustment
Plastic DIL and S.O.I.C. Package Styles