Analog to Digital Converter

[dwight]

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 p850ug1.demon.co.uk
> To: cctech at classiccmp.org
> 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