Baseband Signal Processor
5
MX829 PRELIMINARY INFORMATION
3. External Components
XTAL
X1
R1
XTAL/CLOCK
C1
C2
V
DD
C7
V
DD
XTAL
XTAL/CLOCK
SERIAL CLOCK
COMMAND DATA
REPLY DATA
CS
IRQ
CARRIER DETECT
CD CAP
V
BIAS
C4
C9
Mic
Input
MIC
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
MOD2
MOD1
AUDIO OUT
VOL IN
MOD1 IN
SUM OUT
SUM IN
MSK/DTMF OUT
FILTER OUT
DEMOD FB
DEMOD IN
R7
"C-BUS"
INTERFACE
C3
R4
R2
R3
R5
C6
MX829
C5
R6
C8
Input from
Demodulator
Figure 2: Recommended External Components
C1
C2
C3
C4
C5
C6
C7
C8
C9
External Component Notes:
1. R2, R3, R4 and C3 form the gain components for the Summing Amplifier (AMP2).
R2 and R3 should be chosen as required from the system specification, using the following formula:
Note 2
5.6nF
22pF
22pF
68pF
0.1µF
0.1µF
100pF
0.1µF
±20%
±20%
±20%
±20%
±10%
±20%
±20%
±20%
±20%
X1
Note 3
4.032MHz
±100ppm
R1
R2
R3
R4
R5
R6
R7
Note 2
22kΩ
Note 1
Note 1
100kΩ
100kΩ
1MΩ
±5%
±10%
±10%
±10%
±10%
±10%
±10%
Audio Gain = -
R4
R3
DTMF Gain = -
R4
R2
© 1998 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480160.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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