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What it means when datasheet says 402, 603 packages?

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C

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402, 603 packages

Hi, When a datasheet says 402,603 etc packages for resitors and capacitors, am i right in assuming that the package 402 is the same irrespective of its a cap or resistor.
 

Re: 402, 603 packages

That is correct.
Numbers 603, 0805, 1206 describe the size not the type of a component..
 

    C

    circuit

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Re: 402, 603 packages

Thanks ! I have a few questions. I was looking at the datasheet of an A/D converter eval board. Its a 4 layer board with 1,4 for signal, 2 is ground and 3 is power and also they have copper pour at top and bottom which is grounded. Is this the common practice ?

Also the AD pins says some are analog ground and others are digital ground but the ground plane (inner layer 1) is not divided into two areas to distinguish them ?? I understand there is only one ground eventually and these should be tied together.
 

Re: 402, 603 packages

In multilayer PCBs it is pretty common practice to have layers dedicated for ground, power and signals.
As far as the issue with AGND and DGND is concerned, it really depends on a particular design. If during design process you don't have problems with mixing them you don't separate AGND from DGND.
IC manufacturers provide you with the option of running separate grounds and advice to connect them at one point only using a short and thin truck or an inductor.
But this is not a MUST, it is just an advice ..
 

Re: 402, 603 packages

Thanks once again ! what is the purpose of Ground Copper pour on the top and bottom layer of the board ?
 

Re: 402, 603 packages

It is possible that one pour is AGND and the other may be DGND ..
 

Re: 402, 603 packages

I think they are just having one ground ( one plane) which is inner layer 1 and also the top and bottom pour are connected to it.

What does the ground sandwich formed by these do ? how does it reduce the noise ?

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Re: 402, 603 packages

you must visit ttt.toplinedummy.com (ttt-> www)
thre is alot of datasheet for land pattern
 

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