AD835 and AD834 Multipliers

Hello CircuitDeveloper,

I have moved this query to the Automated Test Equipment (ATE) community. Someone there should be able to assist you better.

Regards,
Gilbeys

Questions:

--  Why didn't you buy the board direct from Analog Devices?

--  You must give spectifc info, not "distortion was unacceptable"  Did it meet the data sheet?  Were you expecting something 10 times better than guaranteed?

--  The Amazon page says 5 Volts.  The data sheet says +/-5V  You didn't show your test setup schematic.

--  "Bandwidth limited"   What number?  at 1V pk-pk?  at 5V pk-pk?

--  If you bought the board from ADI it was tested.  From a third party, who knows what they do?

--  If you have trouble with the board, you have to send it back to who you bought it from, not ADI.

Harry

Hi, Harry, 

      I just wanted to know if Analog Devices permits 3rd party companies to advertise their kits using Analog Devices part numbers, that is all.

      With regard to your other questions,

Why didn't you buy the board direct from Analog Devices?   I bought these kits a long time ago, I probably did not see an Analog Devices kit advertised at your web site and I decided to buy a kit at another web site.    I probably assumed at the time that since the product was advertised with an Analog Devices part number, it may have been designed by Analog Devices and it just happened to be sold through Amazon.      As I recall now, I think I just did a Google search of the AD part number, some "kits" probably popped up with my search, and I probably just clicked on the photo of the kit.     This is how that first question arose - does Analog Devices permit 3rd parties to sell kits using the AD part number name?  

      With regard to your other questions, I just did a quick set up with a dual output arbitrary function generator - sent 2 signals into the inputs at ~1 MHz, a sin and square wave at a variety of amplitudes, and I looked at the output on my oscilloscope at 2 settings 50 ohm and high resistance ~1Mohm (note: my inputs were also varied at 50 ohm and high Z).   I just looked for an output that I know would have been mathematically consistent.    

       After looking at the outputs I just got a little curious and I wondered if, maybe, someone at Analog Devices had any prior knowledge, of or about, this specific kit.   

       So I decided to pose a question at this forum.    

       I can tell from the tone of your response that you approach these inquiries with a lot of "intensity."     This is one of those "no pressure" posts.    Maybe, someone can offer a hypothesis by a visual inspection of the PCB?

Dear Gilbeys;

       Thank you for your reply.    

        Maybe, someone who has had prior experience with this type of problem, can tell me by visual inspection of the PCB that I had linked in my post, what performance I can typically expect with regard to their past experiences.   

Hi CircuitDeveloper,

Any 3rd party can advertise their products with any part numbers they use. For example, there are tons or Arduino clones advertising the same CPU.  However, if there were any issues with their product, you would need to contact the 3rd party you purchased from.  It is probably safe to say that ADI has no prior knowledge of this specific kit.  I previously supported these parts for a time and I personally did not come across any 3rd party boards. 

On the other hand, if you could quantify how the performance deviates from the datasheet specs, that would be helpful to a degree.  Other factors could impact performance such as PCB design or quality of supporting components.  If you suspect a defective part, you should be able to request a sample and then replace the part.  

You can PM me to describe your application and what stage of development you are in.  Thanks.

Cheers,

George