Re: Help with AD75019

From: guy (rachmuth15_at_hotmail.com)
Date: 06/07/04 

Date: 7 Jun 2004 07:56:35 -0700

Yea, I've looked at PCLK, SCLK, and SIN, and the data and timing is
correct... unfortunately the switches aren't taking their right
values, and the SOUT is stuck hi.

clock rate is 2MHz, so that's not the problem.

Any other thoughts?

Thanks
Guy

stratus46@yahoo.com (Glenn Gundlach) wrote in message news:<acb22b57.0406051011.1c963f1a@posting.google.com>...
> rachmuth15@hotmail.com (guy) wrote in message news:<355d2aeb.0406041410.7c2fcc96@posting.google.com>...
> > Hi all,
> >
> > I am trying to use the 16x16 analog switch matrix part #AD75019 from
> > ANALOG DEVICES. I am controlling it using a PIC. The problem is,
> > regardless of what I put on SIN, SOUT is stuck HI. Is there some sort
> > of precharge sequence to initialize the connections? this is very
> > important to my project and I would appriciate any help at all.
> >
> > Thanks in advance
> > Guy
>
> I've never used this AD chip but looking at the data ***, the shift
> register is dynamic and requires a minimum 20 KHz clock rate. Are you
> achieving this rate? Then there is always the possibility of ESD
> failure. Have you looked at the SCLK and PCLK pins with a scope to see
> what is really there? I don't think using a meter to look at SOUT will
> be useful. Just a thought.
> GG

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