The IC can work perfectly from a single 5v supply or a plus 2.5v and minus 2.5V supply if you connect its Lsh and Gnd pins correctly.
The notch frequency can be 1/50th or 1/100th of the clock frequency. The 60Hz notch example shows a resistor trick to get a variable frequency notch that is 1/000th the clock frequency that maybe limits the notch depth to only 40dB.
The notch frequency can be 1/50th or 1/100th of the clock frequency. The 60Hz notch example shows a resistor trick to get a variable frequency notch that is 1/000th the clock frequency that maybe limits the notch depth to only 40dB.