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DM9000BI Datasheet(PDF) 54 Page - Davicom Semiconductor, Inc. |
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DM9000BI Datasheet(HTML) 54 Page - Davicom Semiconductor, Inc. |
54 / 56 page DM9000BI Industrial-grade Ethernet Controller with General Processor Interface Preliminary 54 Version: DM9000BI-13-DS-P02 January 17, 2008 11.7 Magnetic Specification Requirements 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 V - 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). Figure 11-6 Crystal Circuit Diagram 43 44 X1 X2 AGND AGND 22pf 25MHz 22pf |
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