My customers are considering using ADCMP 572.
I got a question about hysteresis of ADCMP 572.
＃1 It is about ± 25 mV, but can you tell me what extent of error is there?
＃2 Is hysteresis about ± 25 mV relative to the amplitude of the differential signal (VP - VN)? Or is it a value with
respect to the amplitude of the single signal (VP or VN), which is about ± 50 mV in total?
For #1, we don't normally spec(min and max) the hysteresis error at a given hysteresis resistor value, but of you will look at figure 7, where HYS pin = 0v (gnd) the hysteresis may be a bit higher that 50mV in the area of <1mV difference, therefore you can expect a error of <+/-500uV on each side.
For #2. +/- 25mV hysteresis is relative with the threshold voltage (Vth,) example is that in case the Vth = 1.5v the hysteresis was set from 1.475V to 1.525V. This gives a total of 50mV hysteresis for the input.
Thank you very much.