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Part Number: ADS7223
we are using the ADS7223 in full clock mode. Our idea was to read the CID with each conversion for plausibility testing. It seem that in this mode the channel number reported is always "00" when CID = "0" which normally should report the Channel ID as per the description of BIT5 (CID disable) on page 35 of the datasheet. There is a hint above the diagrams on page 27 of the datasheet.
However, is there any way to read the CID when using full clock mode? Or is this feature simply not available in full clock mode?
Hi Lutz, Thank you for your post. Can you check whether the customer is using pseudo- or fully-differential inputs (PDE = 0 or 1)? Also, how is the customer selecting the channel - manually or automatically (M0 = 0 or 1)? In Table 4, it looks like Channel Information is only not available when PDE = 1 and M0 = 1.
Applications Engineer | Precision ADCs
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In reply to Ryan Andrews:
Hi Ryan, it is pseudo diffetential input mode andnthebchannelsnswlxted manually. We would like to know if switchong the channels has happened.
In reply to Lutz Naumann:
Ok, so PDE = 1 and M0 = 1? I'll have to talk with Tom Hendrick about what it could be. I'll get back to you soon. Regards,
It is Mode 1 and addressing the next channel manually, Pseudo-Diff on all channels and both SDOx are separate to get the speed up to 1MSPS.
this is what we were expecting as well. Unfortunately in our case the MSBs don't report what channel is being sampled. According to the designer we get 00. We are not sure if we are doing something wrong.
Sorry for the delay. We have an ADS8363EVM (same interface) that we are going to bring up in the lab today.
Meanwhile, can you share a capture of the interface and tell us the clock frequency and data rate?
the part is operated in full clock mode, Mode I, with 1MSPS per ADC. 12bit plus the 2 CID Bits. I do not have the exact SPI clock frequency. But for the functionality of the CID it should not matter from my understanding As this is more about the content of the frame.
Posting a summary of our offline conversation here to close this out:
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