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Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!

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Cyber7:
Tinhead suggests, as per the 1st post, that U25 is an LMX5080 or a MB510 ( 2.7 GHz Low Power Dual Modulus Prescalers).  U25 is definitely made by National Semiconductor, but I can't read the part # in the lo-res image posted by fremen67. There is also a non-populated SOIC8 part on the bottom of the PCB near the non-populated RF jack. Perhaps, the above reference is to this IC instead? Anyone have a good pics of the top/bot of the PCB in this area?  :-//

Problem with the LMX5080 is that it is no longer in production and difficult to source. The Fujitsu MB510 is pin compatible, however, it only implements 4 divide ratios, while the 5080 utilizes pin 7 to double the # of ratios. There  ratios of  1/128 and 1/256 are the only ratios they share in common. 1/512 is not available on the MB510. 2.7Ghz / 256 is ~10Mhz, so 1/512 may not be required as a prescaler.

I should have my HDG2002B in 2 weeks, so I'm hoping I won't have the same issue.  :o I'll put the PCB on an old optical scanner and get some hires images.

I've attached a lo-res image of the u25 area populated, and a LMX5080 SOIC8 in someone's Faraday cage adapter.

leppie:
I am still tempted to get one of these. Have some spare cash that I saved from getting a DS1054Z :)

Is it worth it?

idpromnut:

--- Quote from: leppie on September 23, 2014, 05:24:55 am ---I am still tempted to get one of these. Have some spare cash that I saved from getting a DS1054Z :)

Is it worth it?

--- End quote ---


For the ~300$ you are going to spend, if you want new then yes, it's a pretty good deal for what you get. Like always, you can probably find a better deal on EBay if you wait a bit.

leppie:
I dont really need it per se. Maybe I should look for a better bench supply as I arguably have pretty much the worst bench power supply in the world (ATTEN APS3005S). You ask why? Hundreds of volts overshoot when powering on. Got into a habit of connecting to positive terminal only after power on.

idpromnut:
Hmm, I don't know about a new bench supply, but I know you definitely have a Repair Project on your hands! ;)

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