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DDC2256AEVM: DDC2256A vs AFE2256

Part Number: DDC2256AEVM
Other Parts Discussed in Thread: DDC2256, AFE2256

Hi TI expert

Trying to figure out which DDC2256 or AFE2256 EVM will be best for my system.  Looking for a system that can read current the 15 - 90 nAmp range with a +/- resolution of no more than 3nAmp.  And if these are not the correct system, than a pointer to a system that would be appropriate. 

And/or what these systems lowest current reading range and resolutions are.

Best regards,