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MAX9205 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX9205 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 13 page 10-Bit Bus LVDS Serializers ______________________________________________________________________________________ 11 100 Ω 100 Ω ASIC ASIC ASIC 100 Ω 100 Ω MAX9205 MAX9207 MAX9150 REPEATER MAX9206 MAX9208 MAX9206 MAX9208 Figure 13. Point-to-Point Broadcast Using MAX9150 Repeater 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 27 Ω in this case. Board Layout 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. |
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