CMX969D5 MX-COM, Inc., CMX969D5 Datasheet - Page 6

• Manufacturer Part Number: CMX969D5
• Description: MOTIENT/ARDIS RD-LAP MDC4800 Modem
• Manufacturer: MX-COM, Inc.

MOTIENT
3 External Components
Recommended External Component Notes:
1. The values used for C3 and C4 should be suitable for the frequency of the crystal X1. As a guide, values
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
¤ ¤ ¤ ¤ 2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
(including stray capacitances) of 33pF at 1MHz falling to 18pF at 10MHz will generally prove suitable.
least 40% of V
crystal oscillator design assistance, please consult your crystal manufacturer.
SM
IRQ
WR
RD
CS
/ARDIS
D7
D6
D5
D4
D3
D2
D0
A0
D1
A1
SM
RD-LAP
DD
R1
R2
R3
R4
C1
X1
, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain
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TM
V
4.9152, 7.3728 or 9.8304 MHz ±100ppm. See Section 4.5.2
See Section 4.1
100k Ω ± 5%
1M Ω ± 20%
100k Ω ± 5%
0.1 µF ± 20%
MDC4800 Modem
SS
Figure 2: Recommended External Components
Table 2: Recommended External Components
11
1
10
12
2
3
4
5
6
7
8
9
P4/E2/D5
CMX969
24
23
22
21
20
19
18
17
16
15
13
14
All trademarks and service marks are held by their respective companies.
6
C2
C3
C4
C5
C6
CS
RXFB
TXOUT
RXIN
V
XTAL
XTAL
A1
A0
V
V
BI A S
DD
DD
0.1 µF ± 20%
± 20%, see Note 1
± 20%, see Note 1
100pF ± 5%
100pF ± 5%
C6
R2
16
17
XTAL
XTAL
R4
C1
R3
X1
R1
CMX969 Advance Information
C5
C3
C4
FROM Rx FM
DISCRIMINATOR
Doc. # 20480211.002
C2
TO Tx
FREQUENCY
MODULATOR
V
SS