Datasheet > ELM304P

ELM304P

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
4页	28K
描述
NTSC Video Generator

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ELM304P 数据手册

ELM304

Example Application

The ELM304 is typically used in a circuit such

as the one shown in Figure 1 below. The type of

application determines the supply used – if an AC

type supply is available, 5V is likely to be the best

choice, but battery operation is also a good

alternative. Typical current drain for this circuit is

only about 10mA at 3V for the bar pattern, and

13mA for the white. At this rate AAA type alkaline

batteries are likely to last about 30hrs while AA

alkalines should provide closer to 100hrs of service.

When testing, keep in mind that the output

voltage varies directly with loading. Resistor

values shown assume a load resistance of 75W

connected to the output, and if this is not present,

levels will be considerably higher than the 1V p-p

that is expected.

As always, good wiring practices should be

followed when wiring this circuit. In this case

ringing on the supply lines, stray capacitance, etc.

are likely to result in visible problems however, so

take a little extra care.

Once the power supply voltage is determined,

the values of the summing resistors are chosen

using Table 1 as a guideline. Depending on the

accuracy desired, some trimming of the values

may be required, but these values are likely to

provide satisfactory levels for most applications.

Finally, the required type of output pattern

should be determined. If it is desirable to be able to

change patterns ‘on the fly’, a switch connected as

shown is likely required, but if only one pattern is

required, the Mode input can be connected directly

to VDD (white) or VSS (bars).

330W

680W

220W

470W

430W

150W

Table 1 Typical Resistor Values

VDD

0.1µF

3.58MHz

27pF

75W(unbalanced)

video signal

Mode – switch

closed for bars,

open for white

Figure 1. Typical Circuit Configuration

ELM304DSB

Elm Electronics – Circuits for the Hobbyist

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