AnsweredAssumed Answered

how many ad779x can share CLK pin

Question asked by Aitortxo on Sep 24, 2012
Latest reply on Sep 25, 2012 by Aitortxo

Hello,

 

I would need to connect some (at least 3) AD779x devices.

 

Using internal 64kHz CLK is not an option for all AD779x as the time when all will be on Ready state is unpredictable.

The conversion starting instant needs to be synchronized to maximize the time when all AD779x are Ready

 

The options are:

  1. Configure one of the AD779x to use internal CLK and output the CLK on Pin-2,
    Configure the rest AD779x to use external CLK
    Connect all Pin-2 together
  2. Obtain a 64kHz signal
    Configure all AD779x to use external CLK
    Connect all Pin-2 together to FPGA generated 64kHz pin
  3. Did I forget a better option?

 

The simplest solution would be the first one. I have tried with two(2) AD7792 and appears to work correctly.

 

How many AD779x devices could share CLK pin?

 

Thanks in advance,

Aitortxo.

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