CMX808A Ver la hoja de datos (PDF) - MX-COM Inc
Número de pieza
componentes Descripción
Lista de partido
CMX808A Datasheet PDF : 22 Pages
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Family Radio Service CTCSS Processor
6
3 External Components
C1 X1
C2
XTAL
R1
XTAL/CLOCK
CMX808A Preliminary Information
VDD
VDD
"C-BUS"
INTERFACE
R2
XTAL
XTAL/CLOCK
SERIAL CLOCK
COMMAND DATA
REPLY DATA
CS
IRQ
NC
A/D CAP
VSS
1
20
2
19
3
18
4
17
5
16
6 CMX808AE3 15
7
14
8
13
9
12
10
11
C6
VDD
VOLUME OUT
TX SUB AUDIO OUT
VOLUME IN
TX AUDIO OUT
TX AUDIO IN
RX AUDIO OUT
C3
RX AMP OUT
RX AMP IN
VBIAS
Tx Audio Input
R3
C5
C8
C4
R4
C7
Figure 2: Recommended External Components
Input from
Demodulator
R1
R2
R3
R4 Note 1
C1
C2
C3
1M:
22k:
100k:
22pF
22pF
0.1µF
±5%
±10%
±10%
±10%
±20%
±20%
±20%
C4
C5
C6
C7 Note 1
C8
0.1µF
100pF
0.1µF
0.1µF
±20%
±20%
±20%
±20%
±20%
X1 Note 2 4.0MHz ±100ppm
Table 2: Recommended External Components
Recommended External Component Notes:
1. R3, R4, C5 and C7 form the gain components for the Rx Input Amplifier. R4 should be chosen as required
by the signal level, using the following formula:
Gain = - R3
R4
C7 x R4 should be chosen so as not to compromise the low frequency performance of this product.
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain
crystal oscillator design assistance, please consult your crystal manufacturer.
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480199.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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