LMH0074_1 Datasheet, PDF (2/4 Pages) National Semiconductor (TI) – Replacing the CLC012 Adaptive Cable Equalizer with the LMH0074

FIGURE 1. CLC014 Typical Application
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FIGURE 2. LMH0074 Typical Application
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INPUT INTERFACE
For the typical input interface, the equalizer receives a single-
ended signal over 75Ω coaxial cable. The CLC014 requires
a 75Ω termination to ground, a 1.0 µF input coupling capaci-
tor, and a 100Ω series resistor on each input. On the unused
input, the 75Ω termination to ground is replaced by 37.4Ω to
match the impedance on the active side (which has the 75Ω
cable in parallel with the 75Ω termination).
The 100Ω series resistors are not required for the LMH0074;
however, a 6.8 nH inductor in parallel with a 75Ω resistor
should be added in series on the active input between the
input BNC and the 75Ω pulldown resistor (see Figure 2). This
network provides excellent input return loss. All of these com-
ponents should be placed close to the LMH0074 input pins.
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