MAX9205EAI-T Maxim Integrated, MAX9205EAI-T Datasheet - Page 11

• Manufacturer Part Number: MAX9205EAI-T
• Description: LVDS Interface IC
• Manufacturer: Maxim Integrated

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
Maxim Integrated
Figure 13. Point-to-Point Broadcast Using MAX9150 Repeater
REPEATER
MAX9150
100Ω
MAX9205
MAX9207
ASIC
100Ω
10-Bit Bus LVDS Serializers
ASIC
100Ω
MAX9206
MAX9208
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.
For bus LVDS applications, a four-layer PCB that pro-
vides separate power, ground, and input/output signals
is recommended. Separate LVTTL/LVCMOS and bus
LVDS signals from each other to prevent coupling into
the bus LVDS lines.
MAX9205/MAX9207
MAX9206
MAX9208
ASIC
100Ω
Board Layout
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