FX469 查看數據表（PDF） - CML Microsystems Plc
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FX469 Datasheet PDF : 9 Pages
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Application Information
R1
X1
XTAL/CLOCK
XTAL
C1
C7
Tx SYNC O/P
VDD
C6
C2
Tx SIGNAL O/P
Tx DATA I/P
Tx ENABLE
BANDPASS O/P
Rx ENABLE
V BIAS
V SS
VDD
1
22
2
21
3
20
4
19
5 FX469J 18
6
17
7
16
8
15
9
14
10
13
11
12
VDD
C5
V SS
CARRIER DETECT
C4
TIME CONSTANT
CLOCK RATE
4800 BAUD SELECT
Rx SYNC O/P
1200/2400 BAUD SELECT
C 3 Rx SIGNAL I/P
CARRIER DETECT O/P
CLOCKED DATA O/P
UNCLOCKED DATA O/P
Component
R1
C1
C
2
C3
C4
C5
C6
C7
X1
Value
1.0MW
33.0pF
1.0µF
0.1µF
0.1µF
1.0µF
1.0µF
33.0pF
1.008MHz
or
4.032MHz
Fig.2 External Components
Tolerance
±10%
±20%
±10%
±20%
See
‘Clock-Rate’
Pin
V SS
Notes
1. VBIAS may be decoupled to VSS and VDD using C2 and C6
when input signals are referenced to the VBIAS pin. For
input signals referenced to VSS, decouple VBIAS to VSS
using C2 only.
2. Use C5 when input signals are referenced to VSS, to
decouple V .
DD
3. The value of C4 determines the Carrier Detect time
constant. A long time constant results in improved noise
immunity but increased response time. C may be varied
4
to trade-off response time for noise immunity.
4. C7 reduces Xtal voltage overshoot. Refer to CML Xtal
Application Note D/XT/2 December 1991.
VDD
VDD
MILLI-
AMMETER
PREAMBLE &
PSEUDO-RANDOM
DATA
GENERATOR
Tx
DATA
I/P
Tx SYNC
Tx
SIGNAL
O/P
FX469
TRANSMITTER
(components
as Fig. 2)
VSS
BUFFER
(INTERFACE)
CIRCUIT
OSCILLOSCOPE
TRUE RMS
VOLTMETER
Fig.3 Suggested FX469 Test Set-Up
TELEPHONE
CHANNEL
SIMULATOR
(with attenuator
&
5kHz BW noise gen)
Rx
SIGNAL
I/P
MILLI-
AMMETER
CLOCKED
DATA O/P
FX469
RECEIVER
(components
as Fig. 2)
Rx
SYNC
ERROR
DETECTOR
TRUE RMS
VOLTMETER
CARRIER
VSS
CARRIER
DETECT
DETECT
O/P
O/P HIGH
DETECTOR
4
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