參數(shù)資料
型號: CDB8952
廠商: Cirrus Logic, Inc.
英文描述: CrystalLAN 100BASE-X and 10BASE-T Transceiver
中文描述: CrystalLAN個100Base - X和10Base - T的收發(fā)器
文件頁數(shù): 64/82頁
文件大小: 1130K
代理商: CDB8952
CS8952
64
CrystalLAN
100BASE-X and 10BASE-T Transceiver
TX_NRZ+/- termination components should be
placed as close to the fiber transceiver as possible,
while RX_NRZ+/- and SIGNAL+/- termination
components should be placed close to the CS8952.
The CS8952 100BASE-FX interface IO pins
(TX_NRZ+, TX_NRZ-, RX_NRZ+, RX_NRZ-,
SIGNAL+, and SIGNAL-) may be left unconnect-
ed if a fiber interface is not used.
7.3
A 4.99 k
biasing resistor must be connected be-
tween the CS8952 RES pin and ground. This resis-
Internal Voltage Reference
torbiasestheinternalanalogcircuitsoftheCS8952
and should be placed as close as possible to RES
pin. Connect the other end of this resistor directly
to the ground plane. Connect the adjacent CS8952
ground pins (pins85 and 87)to thegrounded end of
theresistorforminga“shield”around theREScon-
nection.
7.4
The CS8952 may be clocked using one of three
possible schemes: using a 25 MHz crystal and the
internal oscillator, using an external oscillator sup-
Clocking Schemes
+5
1 μH
Ferrite Bead
0.1 μF
0.1 μF
1 μH
Ferrite Bead
0.1 μF
0.1 μF
+5
68
82
191
130
SIGNAL-
SIGNAL+
TX_NRZ-
TX_NRZ+
RX_NRZ-
RX_NRZ+
CS8952
+5
49.9
49.9
63.4
0.1 μF
+5
82
82
130
130
SD
TD-
TD+
RD-
RD+
RxV
TxV
RxV
TxV
CC
EE
CC
EE
8
9
4
5
6
7
4
5
6
7
8
3
2
1
9
HFBR-5103
FIBER TRANS.
Figure 7. Recommended Connection of Fiber Port
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