Hello, is there a way to use a multiplexer IC to allow one AD8495 to "condition" multiple thermocouples? My project requires multiple temperature measurements but I'd like to only have one AD8495 on my circuit board. Any suggestions? Thanks,
Yes, you could use a multiplexer to interface multiple thermocouples to a single AD8495. Things that you have to keep an eye on are
- keeping the multiple reference junctions and AD849x close to each other and at the same temperature as much as possible.
- the switching frequency (of the mux) allows enough time for the AD8495 to settle... this is also related to the max measurement range across the multiple sensors (largest step needed to settle).
See page 7 in AD-369 on using the AD595 with a mux. The concepts are the same for the AD8495.