MX COM Inc MX128DW, MX128P Datasheet
DATA BULLETIN
MX128
*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.
Cordless Telephone Scrambler
Features Applications
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
Battery Powered Portability
Cordless Telephones
Wireless PBXs
+
+
RX Path
TX Path
V
V
BIAS
BIAS
Inversion
Carrier
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).
Cordless Telephone Scrambler 2 MX128
©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.
CONTENTS
Section Page
1. Block Diagram ..........................................................................................................3
2. Signal List .................................................................................................................4
3. External Components ..............................................................................................5
4. Application................................................................................................................6
4.1 Application Notes.................................................................................................................... 6
5. Performance Specification......................................................................................7
5.1 Electrical Performance ........................................................................................................... 7
5.2 Packaging............................................................................................................................. 10
MX•COM, Inc. reserves the right to change specifications at any time and without notice.
Cordless Telephone Scrambler 3 MX128
©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.
1. Block Diagram
+
-
+
CLOCKS
AND
LOGIC
RX GAIN AMP
OUT
RXIN
12
11
2
1
15
14
6
5
4
8
9
16
13
V
BIAS
V
DD
V/2
DD
V
SS
XT AL/CLOCK
CLR
10.24/3.58 MHz
CLOCK SELECT
XT AL
TXIN
TX GAIN AMP
OUT
RX CHANNEL
TX CHANNEL
212 kHz
3.3 kHz
RXOUT
TXOUT
0V
V
BIAS
V
BIAS
Figure 1: Device Block Diagram
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