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MX128

Cordless Telephone Scrambler

MX-COM Inc  

DATA BULLETIN

MX128 Cordless Telephone Scrambler

Features

Full-Duplex Audio Processing

On-Chip Filters

Carrier Rejection >55dB

Uses IF (10.24 MHz) Clock

Requires No Extra Crystal

Excellent Audio Quality

Low Voltage 3.3V/5.0V Operation

ECPA* Qualified Voice Protection

Applications

Battery Powered Portability

Cordless Telephones

Wireless PBXs

TX Path

-

+

VBIAS

Inversion

Carrier

RX Path

-

+

VBIAS

The MX128 is a full-duplex frequency inversion scrambler designed to provide secure conversations for 46/49

MHz cordless telephone users. The RX and TX audio paths consist of the following:

1. A switched-capacitor balanced modulator with high baseband and carrier rejection.

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

3. A 3100 Hz lowpass filter.

4. Input op-amps with externally adjustable gain.

The MX128 uses mixed signal CMOS switched-capacitor filter technology and operates from a single supply

in the range of 3.0V to 5.5V. The inversion carrier's frequency and filter switching clock are generated on-chip

using an external 10.24 MHz or 3.58/3.6864 MHz crystal or clock input (selectable).

The MX128 is available in the following package styles: 16-pin SOIC (MX128DW) and 16-pin PDIP

(MX128P).

*Electronics Communications Privacy Act (Title 18, US Code 2510 et seq.)

©1998 MX-COM Inc.

www.mxcom.com Tel: 800 638-5577 336 744-5050 Fax: 336 744-5054

Doc. # 20480101.010

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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