Circuit for and method of receiving data in an integrated circuit

A method of receiving input signals in an integrated circuit, the method comprising:

• providing a first portion of a circuit having programmable resources;
• providing a second portion of the circuit having hardened circuits including an analog-to-digital converter circuit;
• receiving an input signal at the analog-to-digital converter circuit;
• generating, by the analog-to-digital converter circuit, an output signal based upon the input signal;
• coupling a monitor circuit to receive the output signal generated by the analog-to-digital converter circuit;
• and
• configuring the monitor circuit to hold a calibration of the analog-to-digital converter circuit based upon a threshold associated with at least one of a power or a frequency of the output signal generated by the analog-to-digital converter circuit;
• wherein calibration is re-activated after the at least one of the power or the frequency of the output signal meets the threshold.