My customer is developing a system based on CC2538-CC2592EM-RD. The system will be exposed to extreme temperatures (-40C to 50C). We are looking for crystal or TCXO recommendations that will maintain high accuracy under these conditions.
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My customer is developing a system based on CC2538-CC2592EM-RD. The system will be exposed to extreme temperatures (-40C to 50C). We are looking for crystal or TCXO recommendations that will maintain high accuracy under these conditions.
Have you checked the xtals that are used in the BOM for http://www.ti.com/tool/CC2538-CC2592EM-RD?
Note that most commercial components are rated from -40 to 85 degrees C. You are not stating what "high accuracy" mean.
Thanks for the reply. The customer is making several H/W changes to improve RF robustness. They are looking for 32MHz clock options that offer lower than 20ppm stability / 10ppm tolerance and that spec the frequency down to -40C. The crystal used in the CC2538-CC2592 reference design only specifies the frequency tolerance down to -20C. The customer is willing to move to a TCXO and they are asking if TI has any recommendations.
I just noticed that the title incorrectly states 38MHz. This was a typo as the design actually requires 32MHz. I am unable to edit the title.
For some reason I assumed that the xtal used in the ref design had the same temp spec as the chip.
I could not find any other recommendations than the one used in the ref design. I would recommend contacting the xtal manufacturers directly and provide them with the wanted spec, including the spec that is given in the "32-MHz Crystal Oscillator" table in the datasheet. It also look like it exist different variants of the xtal used in the EVM BOM with larger temp range: https://www.digikey.de/product-detail/en/epson/FA-128-32.0000MF20X-K5/SER4079TR-ND/5209190 (I haven't checked all parameters towards the datasheet. I just used the filtering to come up with some options)