MX429A データシートの表示（PDF） - MX-COM Inc
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MX429A Datasheet PDF : 20 Pages
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1200/2400bps MSK Modem for Trunked Radio Systems
5
3 External Components
MX429A
VDD
VBIAS 1
TRANSMIT OUTPUT 2
C4
RECEIVE INPUT 3
C5
C3
4
VDD 5
R2 'CD' TIME CONSTANT 6
XTAL/CLOCK 7
C6
Recommended Xtal
Component
Xtal/Clock 7
XTAL 8
D0 9
D1 10
D2 11
D3 12
24 CLOCK/4
23 VSS
22 1200/2400 BAUD SELECT
21 IRQ
20 R/W
19 STROBE
18 A1
17 A0
16 D7
15 D6
14 D5
13 D4
X1
R1 MX429A
C1 C2
8
XTAL
D0 D1 D2 D3 D4 D5 D6 D7
MICROPROCESSOR DATA INTERFACE
Figure 2: Recommended External Components
R1
1M 10%
C4
1.0F
20%
R2
1M 10%
C5
1.0F
20%
C1
33pF 20%
C6
1.0F
20%
C2
33pF 20%
C3
0.1F 20%
X1 Note 1 4.032MHz
Table 3: Recommended External Components
Notes:
1. 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, consult your crystal manufacturer.
© 1998 MX-COM Inc.
www.mxcom.com Tel: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480128.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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