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| Rigol New Function Gen DG822Pro Teardown |
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| PELL:
I bought a DG822Pro and take it apart I am not an expert in test equipment. that's why I only show you some teardown photos instead of "reviewing it", in my opinion, good enough for casual use. The FPGA is Artix7 |
| DaneLaw:
--- Quote from: PELL on February 04, 2024, 04:31:18 pm ---I bought a DG822Pro and take it apart I am not an expert in test equipment. that's why I only show you some teardown photos instead of "reviewing it", in my opinion, good enough for casual use. --- End quote --- Dont you OP already have one thread on the DG800 series. https://www.eevblog.com/forum/testgear/rigol-just-launch-its-new-function-generator-dg800pro-900pro/msg5148759/#msg5148759 Why not post it there, unless the number of threads is some merits in itself and every aspect, needs to carry its own thread. Post a screen dump of your DG822PRO stats (infopage "About") ..would like to see the stats on what present models are running, if you just purchased one and it's your portfolio of different tear down pictures above, as I had one since mid-december 2023 and IMO they are quite a mixed bag, not least when trying to compare it to the last-gen DG800 which even seems superior on quite a few factors. |
| PELL:
Thanks for your advice ;) I would think posting these photos in a separate thread would be easier to find and read |
| DaneLaw:
--- Quote from: PELL on February 04, 2024, 05:37:28 pm ---Thanks for your advice ;) I would think posting these photos in a separate thread would be easier to find and read --- End quote --- Usually, people just search for relevant things in the main thread, if a given thread is getting too big, which is far from the case on your other thread, but newermind.. Can you take a picture of your "about page".? |
| TurboTom:
PELL, thanks for taking and sharing these photos. :-+ Basically, here we've got the usual layout of an AWG with the SOC module, FPGA with attached smaple memory, high-speed DAC (here 2.5GSa/s), PLL section (labeled "unknown"), switched attenuators (relays close to the outputs) and some high speed output amplifiers / drivers. I find two details quite interesting here: Rigol provided two different reconstruction filters for each channel that are assiged to the (individually switchable) four outputs of the Texas Instruments DAC38J82. This may be related to the two product lines (DG800 Pro and DG900 Pro) with their considerably different sample frequencies to be able to get along with a single hardware, but it may also provide for different filter envelopes for certain frequency ranges or waveform shapes (I rather assume it's the first... ;)). The other peculiar detail is that Rigol spun their own output driver hybrid. It appears to be a metal core PCB with either bonded or soldered amplifiers and passives that have afterwards been potted in epoxy. Since the AWG doesn't provide any higher output amplitude than "conventional" approaches with TI's THS3491 (or its siblings), and the output drivers of an AWG are at least somewhat exposed to "mishaps", I consider the utilization of a hybrid module here rather disadvantageous -- a DIY repair would hardly be possible and I doubt Rigol would provide these hybrids to customers as spares. Shame that Rigol didn't attach the DAC with all eight high-speed serial lanes to the FPGA (maybe the FPGA doesn't provide more connectivity, I didn't check for that just consulted the DS: the Artix in the 15x15mm² enclosure is only available with a maximum of 4 GTP transceivers, so in order to use all 8 lanes, a higher FPGA type would have been req'd); otherwise it should have been possible to run the hardware at the DAC's full 2.5MSa/s. Otherwise, I'ld bet that the 800 Pro can be made believe it's a 900 Pro -- which it actually probably is anyway, except for some calibration points, just like the "non-Pro" versions were. 8) |
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