EMC immunity AD698 
Author Message
 EMC immunity AD698

I am planning to start a set of designs based on the AD698 LVDT
conditioning chip from Analog Dvices. It would be nice to know how
inherently immune it is to EMC before I start, as I could be building up
lots of problems for later. For example I have seen a circuit that was
immune with an OP07 in it, but failed badly with an OP97. Has anybody
got a feel for how RF proof this chip is? AD had no information.

On the wider issue, are details published anywhere on the immunity and
emission abilities of chips in general. This would be well worth paying
for. I know it will depend on actual circuit configuration etc, but it
would still be better than no information.

John Knapp
Ironic Ltd, Chichester, England



Wed, 17 Mar 1999 03:00:00 GMT
 EMC immunity AD698


JK>I am planning to start a set of designs based on the AD698 LVDT
JK>conditioning chip from Analog Dvices. It would be nice to know how
JK>inherently immune it is to EMC before I start, as I could be building up
JK>lots of problems for later. For example I have seen a circuit that was
JK>immune with an OP07 in it, but failed badly with an OP97. Has anybody
JK>got a feel for how RF proof this chip is? AD had no information.

JK>On the wider issue, are details published anywhere on the immunity and
JK>emission abilities of chips in general. This would be well worth paying
JK>for. I know it will depend on actual circuit configuration etc, but it
JK>would still be better than no information.

Great question.

I suspect the circuit configuration and layout had more to do with the
OP97 failing.  All it takes to make a high gain OpAmp to get upset is
some "conducted" stuff (after being picked up during susceptibility) get
into its leads.  However, just how nonlinear it is inside once that
conducted signal gets there may contribute too.

Ok, if you're collecting a FAQ info....

My experience with the the PIC16 is that even on a two sided board it
passed Class B radiated with great margins.

                                           - Robert -

 * OLX 2.1 TD * Barbers talk behind your back.



Thu, 18 Mar 1999 03:00:00 GMT
 EMC immunity AD698


Fri, 19 Jun 1992 00:00:00 GMT
 EMC immunity AD698

Quote:


>JK>I am planning to start a set of designs based on the AD698 LVDT
>JK>conditioning chip from Analog Dvices. It would be nice to know how
>JK>inherently immune it is to EMC before I start, as I could be building up
>JK>lots of problems for later
>Ok, if you're collecting a FAQ info....

>My experience with the the PIC16 is that even on a two sided board it
>passed Class B radiated with great margins.

I have heard that PIC's are very noisy, but I have used
them in plastic housings and been asked by the test house
to make sure the product was on!  I had however thought
ahead and designed for a clock frequency of only 500kHz,
with very little external activity.  I think the main
problem with PIC's is if you switch the external pins at
high speeds (MHz+) since they have a very high drive
capability (50mA +) and therfore generate very fast edges.

--
Gary Larkin. Potential Electronics, Brighton, England.
Electronic Disability Equipment Designer
Phone/Fax +44 (0)1273 564987.



Sat, 20 Mar 1999 03:00:00 GMT
 
 [ 4 post ] 

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