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Hi, The ADCMP573 datasheet says “The hysteresis pin could also be driven by a CMOS DAC. It is biased to approximately 250 mV and has an internal series resistance of 600 ?.” I am trying to work out how to drive the hysteresis pin with a DAC to set the amo

Question asked by Steve.K on Nov 28, 2017
Latest reply on Feb 25, 2018 by Jvillanu

Hi, The ADCMP573 datasheet says

“The hysteresis pin could also be driven by a CMOS DAC. It is biased to approximately 250 mV and has an internal series resistance of 600 ?.”

I am trying to work out how to drive the hysteresis pin with a DAC to set the amount of hysteresis.

Does the datasheet mean that normally a voltage is generated across the external resistance at the Hysteresis pin by a resistive divider from 250mV through the internal 600 Ohm and the external resistance?

Does this mean that when driving with a DAC, an equivalent voltage (0-250mV) should be presented from a low impedance at the hysteresis pin (From figure 20 of datasheet, 250mV ~ 2mV hysteresis, 125mV ~ 20 mV, 0V ~ 50 mV)?

Thanks

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