Electronics > Projects, Designs, and Technical Stuff

FAST A>D conversion

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NorthGuy:

--- Quote from: stj on April 06, 2019, 11:20:30 am ---now 20MHz is kind of worse case - most signals would be 4MHz or less

--- End quote ---

But if your output is LED, the best you can possibly see is 20 Hz or so.

joeqsmith:

--- Quote from: stj on April 06, 2019, 11:20:30 am ---to answer some questions,
no mutiplexing, just 30 leds wired direct to the binary>decimal convertor.
update rate of the leds would be the rate the data under the probe changes state - that's why the latch is between the dac and binary>decimal decoder.
now 20MHz is kind of worse case - most signals would be 4MHz or less - i picked 20 because it's kind of the max you would see a 74ALS series being run.
i know they can go higher but it's very rare.

--- End quote ---

So you want to make something like the following but with a higher BW?

stj:

--- Quote from: NorthGuy on April 06, 2019, 12:45:30 pm ---
--- Quote from: stj on April 06, 2019, 11:20:30 am ---now 20MHz is kind of worse case - most signals would be 4MHz or less

--- End quote ---

But if your output is LED, the best you can possibly see is 20 Hz or so.

--- End quote ---

i can pause the latch on the buffer to hold the sample - or maybe feed it with a 2-3Hz clock

stj:

--- Quote from: joeqsmith on April 06, 2019, 12:58:53 pm ---
--- Quote from: stj on April 06, 2019, 11:20:30 am ---to answer some questions,
no mutiplexing, just 30 leds wired direct to the binary>decimal convertor.
update rate of the leds would be the rate the data under the probe changes state - that's why the latch is between the dac and binary>decimal decoder.
now 20MHz is kind of worse case - most signals would be 4MHz or less - i picked 20 because it's kind of the max you would see a 74ALS series being run.
i know they can go higher but it's very rare.

--- End quote ---

So you want to make something like the following but with a higher BW?


--- End quote ---

no, that's a 2D display, i'm after a single row of 30led's
your on the right track though, imagine a VU meter with a 20MHz+ frontend.

nctnico:

--- Quote from: joeqsmith on April 06, 2019, 12:58:53 pm ---
--- Quote from: stj on April 06, 2019, 11:20:30 am ---to answer some questions,
no mutiplexing, just 30 leds wired direct to the binary>decimal convertor.
update rate of the leds would be the rate the data under the probe changes state - that's why the latch is between the dac and binary>decimal decoder.
now 20MHz is kind of worse case - most signals would be 4MHz or less - i picked 20 because it's kind of the max you would see a 74ALS series being run.
i know they can go higher but it's very rare.

--- End quote ---

So you want to make something like the following but with a higher BW?


--- End quote ---
That is neat. I made exactly the same thing... over 30 years ago. Only mine had a 16 wide * 8 height display.

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