TLV9061: CMRR min spec with VS = 1.8V, Vcm = -0.1V to 1.9V

Ting,

The expected Vos drift over the full input range for Vs of 1.8V and 5.5V will have the nearly same shift from the PMOS / NMOS input stage switch (most significant factor, but 1.8V will have less Vos drift over the more narrow NMOS range (from -0.1V to the switch). The later is less significant especially for a worst case minimum spec.

The typical data sheet spec drops from 87dB to 81 db, so typical difference is -6dB . Using math and assuming the major drift is same and lesser drift is meaningless is a good worse case assumption. let x = Vos drift. CMRR 5.5V is 5.5/x and CMRR 1.8V = 1.8/x and lastly CMRR[1.8V]/CMRR[5.5V] is (1.8V/x)/(5.5V/x) = 0.327 = -9.7 dB.  The minimum spec for 5.5V is 57dB , so a conservative minimum estimate for 1.8V is 57 - 9.7dB = 47dB