Analog to Digital Converter

Douglas Taylor dj.taylor4 at
Sun Aug 16 10:55:37 CDT 2015

I believe that is true, it is a SAR type of ADC.  That is an import 
piece of information there concerning reading the ADC too fast.

Because I have one instrument that is working properly I can use that as 
a baseline to look at how fast the ADC is being pinged on.

This gives me something to go on.

On 8/16/2015 12:56 AM, dwight wrote:
> Most of these older module use successive approximation
> converters. If you read them too fast, you'll only get a partial
> conversion.
> A number of manufactures made these modules. Analog Devices,
> Harris, Beckman and several others.
> Dwight
>> From: ard at
>> To: cctech at
>> Subject: RE: Analog to Digital Converter
>> Date: Sat, 15 Aug 2015 16:40:40 +0000
>>> 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.
>> [...]
>>> What is inside the box?  Is it a hybrid circuit?
>> I came across somewhat similar looking ADC and DAC modules in an I2S image
>> display system. These were flat metal cans with pins on the bottom, going into
>> individual sockets on the PCB.
>> In that case the can could be opened up quite easily (I think just a couple of points
>> to unsolder. Inside was a PCB _stuffed_ with components, including several possibly
>> custom metal-can ICs (in the case of the ADC I susect fast analogue comparators).
>> Have you tried to open your module? It may not be potted.
>> -tony

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