I am planning to develop a system which will measure 8 channels of LVDT signals.
Initially I was planning to use 8 no's AD598 and sync them to eliminate the beat signal but the cost and availability of the IC led me thinking in an other direection.
I now plan to multiplex these 8-channels to a single AD598.
I am looking for guidance here with some reference material or some schematic concept with few recommended parts. If anyone can comment, it will be great.
I also am unable to understand how will the zero offset for each LVDT be handled.
I will poll each LVDT and I want to finish the process in 3 to 4 seconds. It also involves stepper motors to drive the LVDTs on some fixtures.
Please make me understand how I can acheive this.
Thanks and regards
Can anyone help?
This thread might be able to help you.
ADA2200 is the recommended replacement for AD598. We also have a reference circuit for this part and a similar thread that might be able to help you.
Thank you so much for the revert.
I have already checked https://ez.analog.com/data_converters/precision_adcs/w/documents/3301/ad598-multiple-lvdts previously but was and am unable to understand how to configure this.
Does the answer suggest using a single AD598 and multipler multiplexers?
Are only the output signals multiplexed , or even the excitation multiplexed too?
How does one handle zero calibration of each of the LVDTs?
I checked https://ez.analog.com/amplifiers/f/q-a/102770/multiple-ada2200-demodulating-lvdts-how-to-drive-the-primaries
and have asked a question to the original post.
Please find a conceptual schematic attached
I have shown only 4 no's of LVDTs. As you can see, it can be scaled up.
Will this work?
Here I plan to use a single AD598, a Microcontroller , and use multiplexers to switch excitation signals and secondary voltages.
What can be limitations if not usable?
Please check the proposed scheme and comment