Даташиты - рулёз. Маст рид и всё такое
4.1.3 NORMAL OPERATION
The input stage of the MCP6141/2/3/4 op amps uses
two differential input stages in parallel. One operates at
a low common mode input voltage (VCM), while the
other operates at a high VCM. With this topology, the
device operates with a VCM up to 300 mV above VDD
and 300 mV below VSS. The input offset voltage is
measured at VCM = VSS – 0.3V and VDD + 0.3V to
ensure proper operation.
There are two transitions in input behavior as VCM is
changed. The first occurs, when VCM is near
VSS + 0.4V, and the second occurs when VCM is near
VDD – 0.5V (see Figure 2-3 and Figure 2-6). For the
best distortion performance with non-inverting gains,
avoid these regions of operation.