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| LMH0002 Datasheet, PDF (4/5 Pages) National Semiconductor (TI) – SMPTE 292M / 259M Serial Digital Cable Driver | |||
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Device Operation (Continued)
OUTPUT INTERFACING
The LMH0002 uses current mode outputs. Single-ended
output levels are 800 mVP-P into 75⦠AC-coupled coaxial
cable (with RREF = 750â¦). Output level is controlled by the
value of the RREF resistor connected between pin 4 and VCC.
The RREF resistor should be placed as close as possible to
the RREF pin. In addition, the copper in the plane layers
below the RREF network should be removed to minimize
parasitic capacitance.
OUTPUT SLEW RATE CONTROL
The LMH0002 output rise and fall times are selectable for
either SMPTE 259M or SMPTE 292M compliance via pin 6,
SD/HD. For slower rise and fall times, or SMPTE 259M
compliance, SD/HD is set high. For faster rise and fall times,
or SMPTE 292M compliance, SD/HD is set low.
REPLACING THE GENNUM GS1528
The LMH0002 is form-fit-function compatible with the Gen-
num GS1528 and GS1528A.
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