MX128DW Просмотр технического описания (PDF) - MX-COM Inc
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MX128DW Datasheet PDF : 10 Pages
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Cordless Telephone Scrambler
4. Application
RF
AMP
IF
FM
AMP DETECTOR
RXIN
.1uF
100k
CODE
DETECT
120pF
12
100k
11
RF AMP
mP
DTMF
Generation
MODULATOR
CODE
ENCODE
4
150pF
100k .1uF
TXOUT
6
BASE
MX128
MX128
RXOUT
DE-EMP AF AMP
13
100k
.1uF
150pF
120pF
5
100k 100k
PRE- AF
EMP AMP
6
.1uF
TXIN
HYBRID
TRANSFORMER
TELEPHONE
LINE
RF
AMP
IF
AMP
FM
DETECTOR
RXIN
.1uF
120pF
12
100k
100k
11
CODE
DETECT
KEYPAD
P
RF AMP
MODULATOR
CODE
ENCODE
.1uF 4
100k
150pF
TXOUT
PORTABLE
MX128
Note: Components shown set a gain of 0dB.
RXOUT
DE-EMP AF AMP SPKR
13 100k
.1uF
150pF
120pF
5
100k 100k
PRE-
EMP
6
.1uF
AF
AMP
MIC.
TXIN
Figure 3: Block Diagram of a Typical Application of the MX128 (Cordless Phone)
4.1 Application Notes
Formulas for calculating the carrier frequency, upper cutoff frequency and lower cutoff frequency with clock
select pin high are as follows:
Carrier Frequency
= (3.2995kHz / 10.24MHz) * XTAL frequency
Upper Cutoff Frequency = (2.800kHz / 10.24MHz) * XTAL frequency
Lower Cutoff Frequency = (400Hz / 10.24MHz) * XTAL frequency
Formulas for calculating the carrier frequency, upper cutoff frequency and lower cutoff frequency with clock
select pin low are as follows:
Carrier Frequency
= (3.2995kHz / 3.415MHz) * XTAL frequency
Upper Cutoff Frequency = (2.800kHz / 3.415MHz) * XTAL frequency
Lower Cutoff Frequency = (400Hz / 3.415MHz) * XTAL frequency
©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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