ICS1893AG datasheet(26/135 Pages) ICST

26 / 135 page

ICS1893AG, Rev A 04/14/05

April, 2005

Chapter 6 Interface Overviews

ICS1893AG Data Sheet - Preliminary

6.3.1 Twisted-Pair Transmitter Interface

The twisted-pair transmitter driver uses an H-bridge configuration. ICS suggests any of for the H-bridge:

• Halo TG22S012ND transformer

• Transpower HB617-LP transformer

• Pulse 68517 transformer which can be turned around to move the choke windings to the RJ-45 side.

Figure 6-1 shows the design for the ICS1893AG twisted-pair transmitter interface.

• Two 61.9Ω 1% resistors are in series, with a 120-nH 5% inductor between them. These components

form a network that connects across both the transformer and the ICS1893AG TP_TXP and TP_TXN

pins.

• The ICS1893AG transmitter output H drive configuration supplies power to the transformer. (No VDD

connection is required.)

• The ICS1893AG TP_CT pin is connected directly to the transformer transmit center tap connection and

is bypassed to ground with a 100-pF capacitor.

Note:

1. If the transmit transformer has a choke, it may be put on the chip side, the RJ-45 side, or both.

2. Keep all TX traces as short as possible.

3. When making board traces, 50

Ω-characteristic impedance is desirable.

Figure 6-1. ICS1893AG Transmit Twisted Pair

ICS1893AG

61.9

Ω 1%

120 nH

61.9

Ω 1%

To RJ-45

1:1

System Ground Plane

Chassis Ground Plane

Ω

0.1

µF

Separate Ground Plane

Ideally, for these traces Zo = 50Ω.

Center

Tap

100 pF

TP_TXP 13

TP_TXN 14

TP_CT 11

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