Re: Help with ADC circuit - Anyone ever use LTC1298?

From: Rene Tschaggelar (none_at_none.net)
Date: 10/22/04 

Date: Fri, 22 Oct 2004 22:55:46 +0200

Harry Nguyen wrote:

> Hello ,
> Anyone ever use LTC1982 to build a ADC system. It's a 12bit serial
> interface ADC chip from Linear Technology. They have an application
> note that gives the schematic to couple the chip to PC for data
> logging but when I do as they follow the result I get is very noisy.
> Does anyone have experience dealing with this chip. Thanks a lot
> Hope to hear from you

I didn't use this particular type yet. Apparently it is a n ADC with
capactive input. In order to get satisfying results you need the
caps over the supply. 100nF parallel 22uF. Plus you need the caps
at the input. Note that opamps do not like capacitive loads. So when you
drive the input with an opamp, make sure to have a series resistor.

Rene 

-- 
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
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