AD9945KCPZ Length Matching of data nets

Hi AERO1 ,

It looks like this product is supported in the video forum, I moved it.

A couple of hints on your questions - regarding length matching, that's generally not necessary but you need to make sure that all timing requirements are met (setup, hold)

Regarding grounding and ground planes, you should follow the datasheet recommendation and use a single ground plane.

Also note that this product is not recommended for new designs.

-Mark

Hi Mark ,

Thank you for your response.

1) How do we verify timing requirements , Do we have any specific datasheet to verify timing (setup and Hold time)

2) Yes correct i am following datasheet for layout design, but in datasheet it is mentioned "Single ground plane" i am little confuse, in our design we analog and digital part, should i separate AGND and DGND ground.

3)i see at the end you are not recommending fore new design, which is alternate or equivalent  part number we can use for this part

Request you to guide me here.

Hi AERO1 ,

1) The timing specifications are listed on page 4 of the AD9945 datasheet.

2) I can't speak for the AD9945 specifically, but splitting ground planes under a data converter is generally not recommended. Unfortunately there is quite a bit of historical literature that still describes this practice. Here is a general article on the subject, NOT specific to any particular device: https://hott.shielddigitaldesign.com/pdf_files/june2001pcd_mixedsignal.pdf . The datasheet revision history dates back to 2003, so there may not be any more detailed information available.

3) Probably best to list your application requirements and post a separate question in the high-speed ADC forum.

-Mark