I have an application where I suspect I am running into Idle Tones. We do Gas Chromatography, where the front end is super quiet and we use all the bits.
In the 26 years I have been doing this, every Sigma Delta converter (whether Burr Brown/TI or Analog Device) we have used ultimately showed idle tones somewhere in our application, even if were told they were not there. And then once we found them, folks come clean with...yes...you were not supposed to find them...
For us, it is just a matter of where they are and dealing with them.
So...can you please tell me where Idle tones are likely to occur on the ADS122C04? We think we find them at 10C and sweeping close to a difference of zero on the differential input and using an external reference. More data being taken, but I wanted to get this request in so we can further troubleshoot.
Glen E. Schmidt
R&D Hardware Manager-Process Chromatography
Siemens Industry, Inc.
RC-US DI PA AP R&D
500 US Highway 60
Bartlesville, OK 74003
T: (918) 662-7763
M: (918) 440-3298