CMX589AP4 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX589AP4' PDF : 21 Pages View PDF
High Speed GMSK Modem
6
3 External Components
CMX589A PRELIMINARY INFORMATION
C5
R4
R3
XTAL
XTAL/CLOCK
ClkDivA
ClkDivB
RX HOLD
RXDCacq
PLLacq
RX PSAVE
VBIAS
RX FB
C6 RX SIGNAL IN
VSS
1
24
2
23
3
22
4
21
5
20
6 CMX589A 19
7 E2/D5/D2/P4 18
8
17
9
16
10
15
11
14
12
13
VDD
RX S/N
TXCLK
RXCLK
RXDATA
TXDATA
TXPSAVE
TXENABLE
TXOUT
BT
DOC2
DOC1
C7
C8
VDD
C4
R1
C1
Suggested Clock Circuits
XTAL 1
C3
X1
R2
C2
2
XTAL/CLOCK
Crystal Circuit
XTAL 1
EXT CLK
R2
C9
2
XTAL/CLOCK
External Clk > 10.24MHz Circuit
1 XTAL
EXT CLK 2 XTAL/CLOCK
External Clk ≤ 10.24MHz Circuit
Figure 3: Recommended External Components
Component
R1
R2
R3
R4
C1
C2
C3
Notes
1
2
3
1
4
4
Value
1.0M
Tolerance
±5%
±10%
±10%
±10%
±10%
Component
C4
C5
C6
C7
C8
C9
X1
Notes
5
6
6
7
8
Value
0.1µF
1.0µF
100pF
Tolerance
±20%
±20%
±20%
Table 2: Recommended External Components
Recommended External Component Notes:
1. The RC network formed by R1 and C1 is required between the TX Out pin and the input to the modulator.
This network, which can form part of any DC level shifting and gain adjustment circuitry, forms an
important part of the transmit signal filtering. The ground connection to the capacitor C1 should be
positioned to give maximum attenuation of high-frequency noise into the modulator.
The component values should be chosen so that the product of the resistance and the capacitance is:
For a BT of 0.3 R1C1 = 0.34/bit rate (bps)
For a BT of 0.5 R1C1 = 0.22/bit rate (bps)
1998 MX-COM, Inc.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480183.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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