I would first like to ask you a few qualifying questions to help us better understand your application so that we can make the best recommendation possible.
1) My understanding is that your application is fairly low bandwidth. Is it correct to state that you would need an ADC output rate of 25KSPS or less (That is a pair of results every 40 microseconds or more)? Or thinking about it further if the ADCs are sharing the same data bandwidth is 12.5KSPS or less the ODR requirement?
2) Are you space constrained that you cannot leverage, multiple, single channel ADCs to implement this function OR could you expand on why you require a dual.
3) Do you have a preference for any particular converter architecture?
4) Do you have any requirements with respect to the nature of when you take a sample or if the conversion process is free running?
5) Do you have any specific bandwidth requirements that we should consider when recommending a solution?
6) Are there specific power requirements?
7) Is this a closed loop system and are there latency requirements with respect to your required response profile?
8) Do you require any built-in digital functionality such as oversampling/averaging or digital filtering to meet a specific ENOB requirement?
I have both space constraint, that's why instead of 2 single ended ADC I need dual type, that is one ADC with 2 single ended inputs.
Preferred is delta sigma architecture with 20 or 24 bits.
I'm monitoring or performing self diagnosis of DAC(AD5420) output which is analog current in the range 4-20mA
It should continuously monitor DAC output current and diagnose the same.
With respect to bandwidth or sampling rate I'm still not able to decide on that. What is the factor that decides this. I know this may look very silly
Power preferred is one with 3.3V/5V/12V. One with internal reference is preferred
Please suggest best possible solution (ADC) for the same
Thanks and regards
Nidhi P Shetty
I will refine my search to try and come up with some options for you that we can discuss but I think ultimately the limiting factor will be what you are trying to do....that is the current magnitude contains information that tells the rest of the system what to do OR the precise current I'm trying to send matters and thus I need to be able to compensate for changes at the output quickly.
If you think this is worth a conversation I can have one of our local FAE or FSE get in contact with you so we could have a deeper technical discussion in a more appropriate forum.
Let me know how you would like to proceed.
For my application current error must be less than 0.9uA.
I'm okay with technical discussion as per your suggestion.
We can certainly go into more detail with a face-to-face visit from our local support staff but in the meantime I would check out the AD7768-4. It's a 4-channel device but it might just be the part you are looking for assuming the size of the product is acceptable. I'm going to highlight this thread to the responsible engineer for the product so that if you have any additional questions they'll be better able to service your needs. Best of luck with your design.
Thank you for your support.