Warning - Digital guy wandering into the dark side of Analog design...
I am considering the ADS1118 and a K-Type thermocouple for a glass annealing kiln I am designing. The temperature range could go from ambient to 1100° C. From the literature and YouTube tutorials I believe I understand the input network, and intend to use the Omega PCB to quick connect socket to improve the odds of getting a cleaner signal from the thermocouple. I have not seen specific designs using the ADS1118 that use the full temperature range of a K-Type thermocouple.
My question is one of optimal PCB layout. Is it recommended to use an opto-isolator on the SPI interface? What would be the most effective method of isolating the ADS1118 supply rail? I am not trying to over think the design, but rather start with the best layout possible to improve the odds of a useable design first pass. The only thing I remember from analog design is "Ground" is a place you grow roses.
Any help from the "Analog Gods" would be appreciated, even if it were an admonition to RTFM, as long as the requisite FM reference was given.
Cheers!
David W, Bennington VT