Post Go back to editing

AD7768 daisy-chain, datasheet (latest Rev. B 7/2018) inconsistencies

1. Top of page 73 is quoted below, but Figure 109 itself on previous page shows the connections swapped (DOUT0 and DOUT1 to DOUT7 and DOUT6, respectively).  Which version (text or figure) is the correct one?  Which data input pin should be used when AD7768 (8-channel version) is daisy-chained with DOUT0 only: DOUT6 or DOUT7?

2. The datasheet now documents that the FILTER pin should be logic 1 for use with a crystal.  Previous discussion in this forum shows it should be 0 for use with LVDS clock, but that is not mentioned in the datasheet.

Figure 109 shows an example of daisy-chaining
AD7768 devices,
when FORMATx = 01. In this case, the DOUT0 and DOUT1
pins of the AD7768 devices are cascaded to the DOUT6 and
DOUT7 pins, respectively, of the next device in the chain.

[edited by: marekm at 11:01 AM (GMT -4) on 27 Sep 2018]
Parents Reply Children
  • To use the AD7768 in an array of 8 devices I really need to know how to connect them in daisy-chain.

    This question is from almost 8 weeks ago, the given answer on my original question was far from adequate.

    (My original question is exactly from 4 month ago).

    The datasheet is very confusing in this!

    If I was the product owner, I would give a clear schematic example in the datasheet, saving a lot of wasted time of potential users.

    Normally, you can get help from the development boards schematics but not in this case since it is a single device design.