ELM304
Example Application (continued)
Figure 4. White screen output
V1
V2
V3
Figure 5. ELM304 outputs to give a white screen
you simply connect an oscilloscope probe to the circuit
of Figure 1 without adding the load resistor, the levels
experienced will be about twice the expected 1V p-p.
Hopefully this discussion has provided enough
information to get you started. Since there are no
adjustments required, the circuit is very straight-
forward to build, requiring only a minimum of tools and
test equipment. Have fun building it!
Above are another similar pair of figures, the only
difference being that the ELM304 is now generating a
white raster. To help with the comparisons between
Figures 3 and 5, we have shown all of the dotted lines
in Figure 5 at the same points in time. As expected,
the transitions for an all white raster will only occur
during the sync and blanking pulses, as the rest of the
time, the waveform remains at the white level.
ELM304DSC
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