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PDF MX118P Data sheet ( Hoja de datos )
| Número de pieza | MX118P | |
| Descripción | Full-Duplex Scrambler | |
| Fabricantes | MX-COM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MX118P (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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MX118
FULL-DUPLEX SCRAMBLER FOR CORDLESS TELEPHONES
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
MX118P
(16 pin PDIP)
MX118DW
(SOIC-16)
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 independ-
ent. 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.
The MX118 uses CMOS switched-capacitor filter
technology and operates from a single supply in the range
of 3.0 V to 5.5 V. The inversion carrier's frequency and
filter switching clock are generated on-chip using an
external 4.433619 MHz crystal or clock input.
www.DataSheet4Figure 1 - Simplified Signal Paths
U.com* Electronics Communications Privacy Act (Title 18 US Code 2510 et seq.).
1 page  
Application Information
MX118
Figure 5 - Typical Audio Frequency Response of a Single Scrambled or De-scrambled Channel
System Gains
When calculating the external components for the operation of the MX118 the following should be considered:
a) The input Lowpass Filter has a typical gain of 0.5 dB.
b) The Balanced Modulator has a typical attenuation of 4.0 dB.
c) The Output Bandpass Filter has a typical gain of 4.5 dB.
How the Inverter Works
Carrier Frequency minus Input Voice Frequency equals Scrambled Voice Frequency.
Figure 6 - An Explanation of the MX118 Scramble Operation
MX-COM, INC.
Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MX118P.PDF ] | |
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