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DDC264: Analog input pin sorting order

Yoshinobu Nishiyama
Prodigy 10 points
Part Number: DDC264

Hi teams. I have a concern about the analog input pin sorting order, such as IN1 to IN64. I'm going to design a linear detector with DDC264. With the other manufacturer ADC, I had a trouble according to cross talk between analog input pins. It was caused by the interaction within the chip. Then I dealed with mattching the pin name and the  photo diode order. If DDC264 can also interact between analog input pins in the internal, should I match the pins such as IN1 to In64 and the photo diode order of linear detector to take better images?

  • 0
    TI__Expert 4640 points

    Hi,

    I know we got xtalk data in the DDC2256 DS but we don't for the 264. Honestly never heard about xtalk issues on the DDC264 from any of our customers but it may have been that by default they all did the channel matching or that they simply didn't report back. There are quite a bit of customers... But if you want to be sure, this is something that you could quickly try on our EVM. Sorry can't be of more help.

    Regards,
    Edu

  • 0 in reply to Eduardo Bartolome
    Prodigy 10 points

    Hi Edu. Thank you for careful reply.

    The information which no customer have clamed the cross talk is very helpful. Then, can I confirm how to evaluate the cross talk using EVM? I have an idea about it. The EVM can be connected 10 Mohm resistors to the all channels. When we replace one of them to 1 Mohm, we can measure the output diffirence of the both side of the replaced channel. If there were some difference before and after the replacement, can we estimate that it was caused by the cross talk? 

    Thanks

    Yoshinobu

  • 0 in reply to Yoshinobu Nishiyama
    TI__Expert 4640 points

    Hi Yoshinobu,

    You are exactly correct. That's what I would do. The only thing is that it may be better if you take a blank AIB (analog input board, the board that we provide with the 256 10MOhm resistors, but without the resistors) and just move (solder/unsolder) one 10MOhm resistor, one channel at a time, while measuring all other channels. Kind of painful to do that 64 times...

    ... So maybe an easier way is to not use that AIB board at all and use a through hole resistor (not SMD) and plug/unplug it directly on the connector pin, to avoid soldering/unsoldering.

    Best regards,

    Eduardo

  • 0 in reply to Eduardo Bartolome
    Prodigy 10 points

    Hi Edu.

    Exactly, it's just a hard work. Firstly, I'm going to begin to replace some resistors of them. 

    Thank you for a lot.

    Yoshinobu