XRT4500CV View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT4500CV' PDF : 96 Pages View PDF
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.5
áç
and TX2 respectively. Figure 30 shows how capacitor
C having a value of 100 to 1000 pF bypasses this
point to ground to reduce common mode noise. This
capacitor shorts current caused by differential driver
rise and fall time or propagation delay miss-match di-
FIGURE 36. RECEIVER TERMINATION
rectly to ground. If it was not present, the flow of this
current through the 125 Ω resistor to ground would
cause common mode voltage spikes at the TXA and
TXB outputs.
RXxA
R9
4K
RXxB
R1
20
R10
R2
4K
Rx
R3
S3
20
85
S1
S2
R11 R12
R8
6K 6K
10K
S4
R4
R4
30
30
R6
125
MODE
V.35
V.11 Terminated
V.11 Unterminated
V.10
V.28
TABLE 6: RECEIVER SWITCHES
SWITCHES
S1
S2
S3
Closed
Closed
Open
Open
Open
Closed
Open
Open
Open
Open
Open
Open
Open
Open
Open
S4
Open
Open
Open
Open
Open
63
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