The ATtiny85’s Analog Comparator function is perfectly suited for such a tester. One input of the comparator is biased such that there is a 51 ohm resistor between the input and ground.

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The comparator can be used in digital systems for clock recovery. The device is equipped with the latching (fixation) function of the output signal. The input stage cascade is implemented in CMOS ...

These samples are then driven to a digital comparator in or-der to be compared with a reference signal value. If the input sample is greater than the reference signal then a logic 1 is transmitted and ...