LMH0001 Datasheet, PDF (4/11 Pages) Intersil Corporation – SMPTE 259M / 344M Serial Digital Cable Driver

LMH0001
SNLS276C – AUGUST 2007 – REVISED APRIL 2013
DEVICE OPERATION
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INPUT INTERFACING
The LMH0001 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC
or DC coupling. DC-coupled inputs must be kept within the specified common-mode range. SDI and SDI are self-
biased at approximately 2.1V with V_CC = 3.3V. Figure 2 shows the differential input stage for SDI and SDI.
V_CC
SDI
SDI
V_CC
10 k:
5 k:
80:
10 k:
10 k:
Figure 2. Differential Input Stage for SDI and SDI.
OUTPUT INTERFACING
The LMH0001 uses current mode outputs. Single-ended output levels are 800 mV_P-P into 75Ω AC-coupled
coaxial cable (with R_REF = 750Ω). Output level is controlled by the value of the R_REF resistor connected between
the R_REF pin and V_CC.
The R_REF resistor should be placed as close as possible to the R_REF pin. In addition, the copper in the plane
layers below the R_REF network should be removed to minimize parasitic capacitance.
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