PSN-L Email List Message

Subject: RE: AD7142 ?
From: "James Hannon" jmhannon@.........
Date: Thu, 13 Apr 2006 13:23:30 -0500

I was not considering closing the loop with this particular converter so I did not do any analysis. The data sheet is silent on the issue of pipeline delay but the max sample rate is low enough that I would not even try to use it for a closed loop system.

Jim Hannon

---------- Original Message ----------------------------------
From: "Jack Ivey" 
Reply-To: psn-l@..............
Date:  Thu, 13 Apr 2006 13:48:17 -0400

>Have you done any analysis to see if the data rate would be 
>sufficient to close your loop at high frequencies?  One thing I have
>wondered about is whether the delay produced by these high-resolution
>A/Ds is longer than is implied by the sample rate, i.e. is there a
>pipeline of data coming through and your output is a few samples
>behind the real world.  This could cause stability problems.  
>Actually, it might be worth someone calling up Analog Devices, 
>a friendly applications engineer might have some useful information.
>I can only speak for myself, but I'm interested in hearing developments
>in this area.

Jim Hannon

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