Hello All,
I need to interface a thermosistor, that will be operating in the range of about 40 - 60khm:, to an A/D converter. I'm sure this has been done many times before but I'm having trouble finding the right differential amplifier to use. Some of the parameters I think I'm looking for are: low common-mode voltage, single supply (5v), low gain. Most of what I find accept high common-mode voltages. I'm not using this for sensing current through high voltage motors or something like that. So I don't know if that would pose any kind of problem. As you can tell I'm new to the analog world.
The only part that I think comes close and that I can find avaliable in small qty is the AD22050 from Analog Devices. It is expensive and I'm not sure that it is the right part for the job. Anyone have any suggestions?
Thanks, Dave
I need to interface a thermosistor, that will be operating in the range of about 40 - 60khm:, to an A/D converter. I'm sure this has been done many times before but I'm having trouble finding the right differential amplifier to use. Some of the parameters I think I'm looking for are: low common-mode voltage, single supply (5v), low gain. Most of what I find accept high common-mode voltages. I'm not using this for sensing current through high voltage motors or something like that. So I don't know if that would pose any kind of problem. As you can tell I'm new to the analog world.
The only part that I think comes close and that I can find avaliable in small qty is the AD22050 from Analog Devices. It is expensive and I'm not sure that it is the right part for the job. Anyone have any suggestions?
Thanks, Dave