LMH0356_08 Datasheet, PDF (14/16 Pages) National Semiconductor (TI) – 3 Gbps HD/SD SDI Reclocker with 4:1 Input Mux and FR4 EQs

voltage swing of the LMH0356. In this figure, the LMH0344
cable equalizer restores the signal after the coaxial cable. The
LMH0356 FR4 equalizer restores the signal after the loss due
to the FR4 trace. The LMH0356 inputs have 50Ω internal ter-
minations (100Ω differential) to terminate the transmission
line, so no additional components are required.
The outputs are LVPECL compatible. SDO is the primary data
output and SCO/SDO2 is a second output that may be set as
the serial clock or a second data output. Both outputs are al-
ways active. The LMH0356 output should be DC coupled to
the input of the receiving device as long as the common mode
ranges of both devices are compatible.
Figure 6 shows an example of a DC coupled interface be-
tween the LMH0356 and LMH0302 cable driver. All that is
required is a 100Ω differential termination as shown. The re-
sistor should be placed as close to the LMH0302 input as
possible. If desired, this network may be terminated with two
50Ω resisters and a center tap capacitor to ground in place of
the single 100Ω resistor.
The LMH0356 has multiple ground connections, however; the
primary ground connection is through the large exposed DAP.
The DAP must be connected to ground for proper operation
of the LMH0356.
FIGURE 5. DC Input Interface
30016706
FIGURE 6. DC Output Interface
30016707
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