**Part Number:**CD74HC4046A

Hello,

I'm hoping to find some clarification on Figure 4 of the component datasheet (shown below).

The figure lists the following equation as the characteristic equation of the Vdemout behavior:

VDEMOUT = VPC2OUT= (VCC/4π) (φSIGIN - φCOMPIN);

φDEMOUT = ( φSIGIN - φCOMPIN)

However, the graph shown does not match this equation. The graph indicates that the characteristic equation is more like the following:

VDEMOUT = (VCC/4π) (φSIGIN - φCOMPIN) + (VCC/2)

I'm inclined to believe the graph since the circuit as a whole operates in a 0-Vcc range, but I'd like to be sure instead of making assumptions. Any thoughts on this apparent discrepancy? Thank you