ELM304 データシートの表示（PDF） - Elm Electronics

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ELM304

NTSC Video Generator

Elm Electronics 

Example Application (continued)

ELM304

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.

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.

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!

ELM304DSC

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