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Part Number: ADS1263
I am testing the ADS1263 for some new instruments and have a strange problem.
At the moment i have 2 different boards using the ADS1263
One is using the ADS1263 with an +2.5V and -2.5V analog supply and that is working ok.
The other is using a +5V analog supply and here the A/D conversion is not working correctly
I can program the ADS1263 without problem but when i read the data from the conversion register
i get an status back of 0x64 wich indicates that the ADS1263 is using an external clock but pin 15 is connected to ground
so it should be using the internal clock , the other board works that way without a problem.
Since the oscillator is not selectable via the registers my conclusion was that the chip was defective so i replaced it.
That did not solve the problem , the new chip also thinks it is using an external oscillator.
So i can't figure out what causes this problem.
The only thing i see is that both working boards have a ADS1263 with different codes on the housing as the board that does not work.
So it might be that i have some bad chips but that is unusual for new chips that were in a strip that was cut form a reel by Farnell
Any suggestions for other possible causes ??
Ed van Rijn
Best regards,Chris HallApplications Engineer | Precision ADCs
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In reply to Christopher Hall:
Thanks for your fast reply.
Based upon your remarks and question i looked a the schematics and pcb layout.
I copied a part of the schematic into this reply/
Analog and digital ground are both connected to a common analog groundplane so they are connected together and
since the analog groundplane is seperated from the digital groundplane there is no groundbounce problem, in fact
the board layout is almost exactly like the layout in figure 163 of the datasheet.
It turned out that i was fooled by an error in my firmware, the status printed on screen displayed 0x64 but shoul have been showing 0x40
wich is of course 64 in decimal.
I changed this and completed dome more firmware routines and now everything is working ok.
Thanks for for your help.
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