Failing 3.3v Test!

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ItalianPride
 
Posts: 7
Joined: Wed May 12, 2010 12:35 pm

Failing 3.3v Test!

Post by ItalianPride »

My friend and I are both getting the 5V with the recommended tests but are failing to pass the 3.3V test. I am not getting anything while he is getting a slowly increasing voltage that hovers around 1.6-2.0 volts. Do you have any suggestions. We looked through the posts on other forms without much success.

We checked the boards multiple times and we have the exact same parts in the same spots. And also any suggestions assuming the soldering joints are fine and there are no solder bridges.

Thanks!

ItalianPride
 
Posts: 7
Joined: Wed May 12, 2010 12:35 pm

Re: Failing 3.3v Test!

Post by ItalianPride »

Does anyone have any suggestions at all? We don't want to order the VCO's until the problem is solved. Thanks!!

Khanzerbero
 
Posts: 2
Joined: Mon May 17, 2010 7:33 am

Re: Failing 3.3v Test!

Post by Khanzerbero »

have you tried changing the parts? maybe you got defective parts in my country it is not uncommon to get defective chips some even rewrite the package of an inexpensive ic to some more expensive one an sell the them as such. but you shouldn worry.

"The 3.3V LDO powers the microcontroller, the waveform generator and the digital potentiometers. If the 5V supply is actually 5V (and not 6 or 7V) then the chip can be left out and 5V jumpered to the 3.3V. However, the 3.3V will be a little cleaner which may be desirable and all things being equal, it should probably be left in. A TI chip (the 27333 is used), but there are many other SOT23-5 pin compatible chips.

The 2.5V supply is for powering the PLL, which requires a <3V supply, if the PLL is not installed, dont install this supply."

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