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: a...@p850ug1.demon.co.uk > To: cct...@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