4-Level FSK Modem Data Pump
Page 8 of 50
MX929B PRELIMINARY INFORMATION
3. External Components
V
DD
C1
C8
R2
R1
From Rx FM
Discriminator
To Tx Frequency
Modulator
µCONTROLLER INTERFACE
IRQ
D7
D6
D5
D4
D3
D2
D1
D0
RD
WR
CS
A0
A1
1
2
3
4
5
6
7
8
9
10
11
12
MX929B
V
SS
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
RXAMPOUT
RXIN
V
BIAS
TXOUT
DOC1
DOC2
XTAL/CLOCK
XTAL
A1
A0
CS
R4
C7
C6
C5
C2
17
XTAL/CLOCK
X1
R3
XTAL
C3
C4
16
Figure 2: Recommended External Components
Component
R1
R2
R3
R4
C1
C2
C3
Notes
1
Value
100k
:
1M
:
100k
:
0.1 µF
0.1 µF
3
Tolerance
r
20%
r
5%
r
20%
r
5%
r
20%
r
20%
r
20%
Component
C4
C5
C6
C7
C8
X1
Notes
3
4
5
5
4
2
Value
Tolerance
r
20%
r
5%
r
20%
r
20%
r
5%
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