Which of the following require(s) interfacing circuitry?

A comparator circuit accepts input of ________ voltages and provides a ________ output that indicates when one input is less than or greater than the second.

In a ladder-network conversion, the ________ circuit provides a signal to stop the counter when the staircase voltage rises above the input voltage.

In a ladder-network conversion, ________ ladder stages provide ________ voltage resolution.

The free-running frequency of a 565 FSK decoder is adjusted with ________.