We are reevaluating the use of the ADA4938. The CMRR is specified to be TYP: -75dB @ ∆VIN, cm = ±1 V, f = 1 MHz.
Unfortunately the SPEC stops in the interesting regime and hints more to a static CMRR below 100kHz.
- Could anyone explain this behaviour?
- We could not see any tuning of this with temperature?
- Is this resulting from Design and are the features under different conditions static?
- Is it device to device dependent?