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Siglent SDS1000(X) / SDS2000(X) or LeCroy WaveAce (Blackfin) hacks?

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SMB784:

--- Quote from: tv84 on August 14, 2018, 07:38:15 pm ---
--- Quote from: markus_jlrb on August 14, 2018, 06:25:27 pm ---the other named AUE7256 is unkown to me.

--- End quote ---

It looks like 7258, not 7256.

--- End quote ---

Looks to me to be 7258 as well.

markus_jlrb:
But which component with what functionality?

The ADS7822 (12bit ADC 200kHz) - if it is the proper ic - could
be for offset control. See Daves video on YT about R&S DSO.

But what is the 7258 or 7256 and what is the inon (half circle)
stands for?

Markus

tv84:

--- Quote from: markus_jlrb on August 14, 2018, 06:25:27 pm ---One of them could be TI's ADS7822 (12bit ADC 200kHz)

--- End quote ---

Looking at Dave's video, we can see a IC with the same 6552 (and a different reference on top).

So, this is a LMH6552 - LMH6552 1.5-GHz Fully Differential Amplifier.

Look at this thread, they did the same investigations to increase a Keysight scope BW:

https://www.eevblog.com/forum/blog/eevblog-978-keysight-1000x-hacking/375/

Edit1: rf-loop, just discovered this other thread.

rf-loop:

--- Quote from: markus_jlrb on August 14, 2018, 06:25:27 pm ---Dear's

need some help identifying the attached ic's.
Have found them when looking deeper inside
the sds frontend amplifier stage.

One of them could be TI's ADS7822 (12bit ADC 200kHz)
the other named AUE7256 is unkown to me.

And hints which manufacturer and which type these
eight pin ic is.

Thanks in advance for any helpful info.

Markus

--- End quote ---

Imho:
AUE = model... nice quesswork (example LMH6629 (sure it is not))
under it I believe there is datecode.

If you analyze even tiny bit this circuit you can see that signal coming in (after relays) is splitted to two pathways   before this IC. Other pathway go to discrete fet HF amplifier  and other pathway (DC and low freq (there you see also AC/DC switch "Cosmo") come to this "AUE"  IC pin 3 and as can see IC output is pin 6.
Without further explanations what I know or do not know or what ever... ;)

I "believe" it is (single) operational amplifier in MSOP8 type case
(This scope front end is classic "dual pathway" (separate pathways for DC-LF and HF) type what is widely used in this kind of oscilloscopes..)

This is only guiding hint and enough from me.

markus_jlrb:
@rf-loop,

thanks for clarification and your hints and link advisory.

Markus

PS.: Btw - what function has the 595 serial/parallel
shift register? Is it needed for relais switching control?

Markus

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