CRD8900A-1 Cirrus Logic Inc, CRD8900A-1 Datasheet - Page 132
CRD8900A-1
Manufacturer Part Number
CRD8900A-1
Description
KIT EVAL FOR CS8900A
Manufacturer
Cirrus Logic Inc
Series
CrystalLAN™r
Datasheet
1.CS8900A-CQZ.pdf
(138 pages)
Specifications of CRD8900A-1
Main Purpose
Interface, Ethernet
Utilized Ic / Part
CS8900A
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Other names
598-1163
- Current page: 132 of 138
- Download datasheet (2Mb)
8.5 10BASE-T WIRING
•
•
•
•
132
CS8900A
If a center tap transformer is used on the RXD+ and RXD- inputs, replace the pair of Rr re-
sistors with a single 2xRr resistor.
The Rt and Rr resistors are ±1% tolerance.
The CS8900A supports 100, 120, and 150 Ω unshielded twisted pair cables. The proper val-
ues of Rt and Rr, for a given cable impedance, are shown below:
Note: for 3.3V operation the turns ratio on TXD+ and TXD- is 1:2.5, rt is 8
and the 68pF cap changes to 560pF.
+
-
TXD +
TXD -
RXD+
RXD-
Cable Impedance (Ω)
Rt
Rt
0.01 μ F
100
120
150
CIRRUS LOGIC PRODUCT DATASHEET
0.01 μ F
68 pF
Rr
Rr
Rt (Ω)
24.3
30.1
37.4
1 :
1 : 1
2
Crystal LAN™ Ethernet Controller
RD +
Rr (Ω)
TD +
RD -
TD -
49.9
60.4
75
1
2
3
6
Ω
for 100
RJ45
CS8900A
Ω
DS271F5
cable
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