ICS1894-40 Datasheet, PDF(29/52 Page) Integrated Device Technology – 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

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ICS1894-40 Datasheet, PDF (29/52 Pages) Integrated Device Technology – 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

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ICS1894-40

10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

ICS1893CK-40 TCSR

Typical Board Layouts

TCSR Bias Resistors

ICS1894CK-40

VDD

18.2Kâ¦ 1%

TCSR

VDD

100TCSR

1.82Kâ¦ 1%

PHYCEIVER

Note:

1. The bias resistor networks set the 10baseT and 100baseTX output amplitude levels.

2. Amplitude is directly related to current sourced out of the TCSR pin.

3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer effects.

4. The VDD connection to the 18.2K resistor can connect to any VDD. The 18.2K resistor provides negative

feedback to compensate for VDD changes. Lowering the 18.2K value will lower the 100baseT amplitude.

IDTâ¢ / ICSâ¢ 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 29

ICS1894-40 REV C 092909

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