DM355 VPBE: Internal structure for TVOUT, IOUT and VFB pins

I am not sure exactly what you are looking for.  The main data-sheet (http://focus.ti.com/lit/ds/symlink/tms320dm355.pdf) normally has information on how to terminate pins as well as electrical and timing characteristics of pins.   Additional information can be obtained by looking the at TRM for the EVM available at spectrum digital, it includes schematics which can be used as a sort of reference design. http://c6000.spectrumdigital.com/evmdm355/reve/files/EVMDM355_TechRef_RevD.pdf

Thanks for your answer Juan.

I have some custom boards all running the same software but a few of them don't output analog video. In order to evaluate what's happening or what's wrong I would like to know the internal structure of these pins. The thing is that I'm not sure if the problem has to do with the DM355 being broken or with a bad soldering of these pins.

So I should be grateful if I could know how these pins are inside the DM355, because I can compare the signals in the three pins with the signals caught in a correct board, but without knowing their structure the comparation has no sense. Does IOUT come from a current amplifier after the ADC? Do VFB and TVOUT and the corresponding resistances conform an amplifier structure? What should I see (theoretically) in IOUT and VFB?

Once again, thanks in advance.

Please, I still need help!

I have forwarded your request to our hardware team to see if they can help; however, please note that our main data-sheet has instruction for proper termination of these signals when they are being used or un-used.  I am not a hardware designer, but I believe following these recommendations should work; I have been helping customers with design issues for a few years and this is the first time I get a request for the internal structure of signals.  Hopefully our hardware team can help.

Thanks Juan!

The thing is that I have many custom boards totally equal in hardware and software. Most of them output video but a few don't. I don't know what to think, because it might be due to a bad soldering of the DM355 or to the DM355 being somehow damaged. I try to guess which one is the reason by interpreting the output of these pins. That's why its internal configuration might help me in order to know what should I see in the pins. Thanks again for your interest!

Here I am, back from holidays!

Is there any new information about the topic?

I have been looking into this; unfortunately, all the information I have received or have been able to find on this leads back to leads back to Figure 5-32 on data-sheet.  To get more detailed information, you may need to work with your local sales representative and sign an NDA.