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MAX9205
(Rev.:2001)

10-Bit Bus LVDS Serializers

Maxim Integrated 

10-Bit Bus LVDS Serializers

A point-to-point version of the multidrop bus is shown in

Figure 13. The low-jitter MAX9150 10-port repeater is

used to reproduce and transmit the serializer output

over 10 double-terminated point-to-point links.

Compared to the multidrop bus, more interconnect is

traded for more robust hot-plug capability.

The repeater eliminates nine serializers compared to 10

individual point-to-point serializer-to-deserializer con-

nections. Since repeater jitter subtracts from the serial-

izer-deserializer timing margin, a low-jitter repeater is

essential in most high data rate applications.

Multiple serializers and deserializers bused over a dif-

ferential serial connection on a backplane are shown in

Figure 14. The second serializer can be a backup to

the primary serializer. The typical close spacing (1in or

less) of cards on a backplane reduces the characteris-

tic impedance by as much as half the initial, unloaded

value. Termination resistors that match the loaded char-

acteristic impedance are required at each end of the

bus. The total loaded seen by the serializer is 27Ω in

this case.

Board Layout

For bus LVDS applications, a four-layer PC board that

provides separate power, ground, and input/output sig-

nals is recommended. Separate LVTTL/LVCMOS and

bus LVDS signals from each other to prevent coupling

into the bus LVDS lines.

ASIC

ASIC

ASIC

MAX9205

MAX9207

MAX9150

REPEATER

MAX9206

MAX9208

100Ω

100Ω

100Ω

Figure 13. Point-to-Point Broadcast Using MAX9150 Repeater

MAX9206

MAX9208

100Ω

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