MX469D3 データシートの表示（PDF） - MX-COM Inc
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MX469D3 Datasheet PDF : 17 Pages
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1200/2400/4800bps MSK Modem
6
3. External Components
X1
C1
C6
VDD
C5
C2
XTAL/CLOCK
R1
1
20
XTAL 2
19
TX SYNC OUT
3
18
TX SIGNAL OUT
4
17
TX DATA IN 5
TX ENABLE
6
MX469 16
15
BANDPASS OUT 7
14
RX ENABLE
8
13
VBIAS
9
12
VSS
10
11
MX469
VDD
VDD
C7
CARRIER DETECT TIME CONSTANT
CLOCK RATE
C4
4800 BPS SELECT
1200/2400 BPS SELECT
RX SYNC OUT
RX SIGNAL IN
C3
CARRIER DETECT OUT
CLOCKED DATA OUT
UNCLOCKED DATA OUT
Figure 2: Recommended External Components
Component
R1
C1
C2
C3
C4
C5
C6
C7
X1
Notes
Note 1
Note 2
Note 3
Note 2
Note 4
Value
1.0M
33pF
1.0µF
0.1µF
0.1µF
1.0µF
33pF
1.0µF
1.008MHz or 4.032MHz
Tolerance
±10%
±5%
±20%
±20%
±10%
±25%
±5%
±20%
See ‘Clock-Rate’ Pin
Table 4: Recommended External Components
Notes:
1. The value of C4 determines the Carrier Detect time constant. A long time constant results in improved
noise immunity but increased response time. C4 may be varied to trade-off response time for noise
immunity.
2. Decoupling circuits depend upon whether the input signal is referenced to VBIAS or VSS. Use C5 when
the input signal is referenced to VBIAS. Use C7 when the input signal is referenced to VSS. It is not
necessary to use both C5 and C7.
3. C6 reduces Xtal voltage overshoot. Reference the MX-COM Xtal Application Note.
4. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To
obtain crystal oscillator design assistance, consult your crystal manufacturer.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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