DM9010BI datasheet(57/60 Pages) DAVICOM

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DM9010BI

Industrial-temperature Single Chip Ethernet Controller with General Processor Interface

Preliminary

Version: DM9010BI--DS-P01

January 12, 2010

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

Values

Units

Test Condition

Tx / RX turns ratio

1:1 CT / 1:1

Inductance

350

μH (Min)

Insertion loss

1.1

dB ( Max )

1 – 100 MHz

-18

dB ( Min )

1 –30 MHz

-14

dB ( Min )

30 – 60 MHz

Return loss

-12

dB ( Min )

60 – 80 MHz

-40

dB ( Min )

1 – 60 MHz

Differential to common

mode rejection

-30

dB ( Min )

60 – 100 MHz

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).

AGND

22pf

25MHz

22pf

Figure 11-6

Crystal Circuit Diagram

DM9010BI Datasheet(PDF) 57 Page - Davicom Semiconductor, Inc.

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