4-Level FSK Modem Data Pump
Page 8 of 50
MX929B PRELIMINARY INFORMATION
3. External Components
VDD
C8
R2
C1
VDD
24
From Rx FM
Discriminator
1
IRQ
R1
RXAMPOUT
RXIN
2
3
D7
D6
D5
D4
D3
D2
D1
D0
RD
WR
23
22
21
20
19
18
17
16
15
14
13
V
To Tx Frequency
Modulator
BIAS
4
R4
TXOUT
DOC1
DOC2
XTAL/CLOCK
XTAL
5
MX929B
6
7
8
9
C2
C6 C5
C7
A1
10
11
12
A0
XTAL/CLOCK
VSS
CS
17
CS
A0
A1
C3
X1
R3
C4
16
XTAL
Figure 2: Recommended External Components
Component
Notes
Value
Tolerance
r20%
r5%
Component
Notes
Value
Tolerance
r20%
r5%
R1
R2
R3
R4
C1
C2
C3
1
C4
C5
C6
C7
C8
3
4
5
5
4
100k:
1M:
100k:
0.1 µF
0.1 µF
r20%
r5%
r20%
r20%
r20%
r20%
r20%
r5%
3
X1
2
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