Re: Analog I/O - How to do it?

From: Jim Thompson (thegreatone_at_example.com)
Date: 08/24/04 

Date: Tue, 24 Aug 2004 08:30:27 -0700

On Tue, 24 Aug 2004 14:17:17 GMT, "Spaceghost"
<nospam@postingroup.com> wrote:

>Hi, in my past experience with I/O, it's been digital...the pad was from an
>IP provider, and had ESD protection. I'm working in the analog world now,
>and am wondering how you are supposed to get the signal into the chip. I
>mean, do you just directly wire from the bond pad to say, the input terminal
>of your op-amp? I guess I'm trying to figure out if any special I/O or
>protection circuitry is needed.
>
>Thanks,
>Marc
>

Pads are pads are pads. Now-a-days pads are **always** specified by
the foundry. About the only choice you have is whether to use a
series-R version or not.

But ESD can be a leakage path. Occasionally I specify no ESD
structure, or tie both diodes to ground when signals are small and
ground-centric.

                                        ...Jim Thompson 

-- 
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
I love to cook with wine.      Sometimes I even put it in the food.

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