DM9010BI
Industrial-temperature Single Chip Ethernet Controller with General Processor Interface
11.7 Magnetics Selection Guide
Refer to the following table for 10/100M magnetic
specification requirements. The magnetic which meet
these requirements are available from a variety of
magnetic manufacturers. Designers should test and
qualify all magnetic specifications before using them
in an application. Industrial-temperature range, RoHS
regulations, please contact with your magnetic
vendor, this table only for you reference,
Parameter
Tx / RX turns ratio
Inductance
Values
1:1 CT / 1:1
350
Units
-
Test Condition
-
-
μH (Min)
dB ( Max )
Insertion loss
1.1
-18
1 – 100 MHz
1 –30 MHz
30 – 60 MHz
60 – 80 MHz
1 – 60 MHz
60 – 100 MHz
-
dB ( Min )
dB ( Min )
dB ( Min )
dB ( Min )
dB ( Min )
V
Return loss
-14
-12
Differential to common
mode rejection
-40
-30
Transformer isolation
1500
11.8 Crystal Selection Guide
A crystal can be used to generate the 25MHz
reference clock instead of an oscillator. The crystal
must be a fundamental type, and series-resonant.
Connects to pins X1 and X2, and shunts each crystal
lead to ground with a 22pf capacitor (see figure 11-6).
X1
X2
21
22
25MHz
22pf
AGND
22pf
AGND
Figure 11-6
Crystal Circuit Diagram
Preliminary
57
Version: DM9010BI--DS-P01
January 12, 2010
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
