Analog to Digital Converter
jonelson126 at gmail.com
Sat Aug 15 20:41:46 CDT 2015
On 08/15/2015 11:18 AM, Douglas Taylor wrote:
> I have a number of laboratory instruments that are from the 1990 time
> frame. They produce digital data that is the digitized signal from a
> detector, the data can be from 512 to 65K samples long. The ADC used
> in these instruments is a 16bit 100ksample/sec design. The ADC is in
> a 3 by 4 inch metal box with a row of pins on each long edge.
> I think some of them are failing because I get the full 16 bit
> resolution from one machine, but not the others. This was determined
> by taking the digital samples and sorting the values and computing the
> increments between the adjacent values. In some cases the output
> looked like 14 bit resolution and in one case 6 bit resolution.
> Does anyone have any experience with technology?
> Who was the manufacturer? (There is no id on the outside)
> What is inside the box? Is it a hybrid circuit?
DDC made a number of hybrid ADCs, but I've never seen one that was 3 x
4"! That's really big. Most likely there is a normal PC board inside,
with a bunch of chips and discrete components on it. Is this box
hermetic, or maybe if you peel back a label, there may be screws that
hold it together.
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