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Hantek 2000 series - 2C42/2C72/2D42/2D72
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gf:

--- Quote from: tsman on February 04, 2019, 05:13:03 pm ---He knows roughly what the missing parts are but doesn't know the values or the exact DAC/opamp used.

--- End quote ---

He speculates OPA690, which is a (500MHz unity gain) voltage-feedback opamp.

The AWG of the Hantek 6xx4BD (which has roughly similar specs) uses a 5166ISZ behind the DAC902, which is a 1.4 GHz current-feedback amp. So I'm wondering wheter it is supposed to be a current feedback amp as well in the 2Dx2 models (and maybe also a faster one than OPA960)? Just a guess...

EDIT: I could not resist and opened my 2D72. U13 is a 5166ISZ as well, like in the 6xx4BD models.

EDIT: just realized that a photo of U13 was already posted here: https://www.eevblog.com/forum/testgear/hantek-2c422c722d422d72/msg2183363/#msg2183363 - interestingly, the IC is a different model (LMH6702 vs. 5166ISZ in my 2D72).

gf
Microcheap:

--- Quote from: AxGxP on February 07, 2019, 10:38:56 am ---Do you have ST-Link? Can you readout a dump of from your device. It will be interesting to compare it with lower version.

--- End quote ---

I do have a ST-Link, but to be honest I've never used it, I bought it with a stm32 blue pill board to start learning some ARM micro, but didn't have the will to start yet.  :palm:

If you can provide some direction I can certainly try it.
Microcheap:

--- Quote from: gf on February 07, 2019, 09:52:42 pm ---The AWG of the Hantek 6xx4BD (which has roughly similar specs) uses a 5166ISZ behind the DAC902, which is a 1.4 GHz current-feedback amp. So I'm wondering wheter it is supposed to be a current feedback amp as well in the 2Dx2 models (and maybe also a faster one than OPA960)? Just a guess...

--- End quote ---

What is your board revision? Hantek uses the DAC902E and the EL5166ISZ in their DSO4000 series bench scopes that also has an AWG. They could be using new ICs in newer revision boards, the marking on the DAC in my 2D42 was erased, but the little I could see doesn't look a DAC902 and I doubt they would have two different boards for the 2D42 and 2D72.
gf:
My board revision is HT2xxx_M Rev. A08, 2018.

After removing the board and turing it around I noticed the same as you did - the markings on the ADC are not readable.

EDIT: It seems to end with the letters ...AK, or maybe ...ZAK. I'll add a photo.

EDIT: According to the 2nd photo, it could also be ...EAK or ...FAK.

EDIT: The connections of the DAC to other components of the board suggest a pinout like DAC902's, though. I measured ADC clock of 250 MHz clock (as specified). The DAC902 in my Hantek 6074BD (here the marking it is readable) runs only at 200 MHz (which is alrady overclocked by 21%). Searching for an (almost) pin-compatible alternative to DAC902, I found only AD9742, which is specifed for a higher rate of 210 MSPS minimum. Maybe there exist Chinese pin-compatible DAC ICs as well?

Looking at the datasheets of the amps, the EL5166 and LMH6702 are both CFAs. The EL5166 can be enabled/disabled, though, via pin 8 (-> power saving), and pin 8 is indeed driven low/high, when the AWG is turned on/off. Besides that, both ICs have the same pinout, so that LMH6702 can likely replace the EL6166 almost 1:1 if power saving is renounced. Unity gain bandwidth of LMH6702 is a bit higher, on the other hand the EL5166 has a higher slew rate and can drive more output current (not sure if this is relevant for this particular use case). The other components around U13 look identical in your and my photo.

gf
AxGxP:
There was a hardware problem with measuring voltage more then 400 V. Burned resistor R15 (1kOhm). Changing to new one solved the problem.

To readout the firmware by ST-Link yo need to download "STM32 ST-LINK Utility".
Connect ST-Link to display board. (GND, SW_CLK, SW_DAT)
Push power button to power on the oscilloscope.
In ST-LINK Utility:
 Address: 0x08000000
 Size: 0x800000
 Menu: Target->Connect
 You will see the content of the memory.
 Right click on "Device Memory" -> Save to file
 Select HEX and save. (the file will be 1.2Mb)
 Press menu: Target->Disconnect
 Disconnect the wiring.
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