Zero crossing detector with AD790

Question

Hi every ! 
 I'm designing a Zero crossing detector with a AD790 , the input is a +/- 10V sinus signal . 
 Output should be hight if Vin > 0V and low if Vin < 0V 
 I'is working , BUT a have a lot of oscillation at the output . 
 Is it possible to add a couple of resistor to make a hystérésis with AD790 ? 
 How much should be the hystérésis ? ( 10mV , 50 mV ?? ) 
 thx

FormerMember · Accepted Answer

Never put caps on analog outputs unless you know exactly why you are doing it. 
 Yes, you can add hysterensis. Because of the big signal swing, I would start with 
 100 mV of hysteresis. 
 If this is going into a product for work that will fly, contact your local ADI FSE and FAE 
 for off line help. 
 Harry

FormerMember · Answer

Sorry, I forgot to reference MT-083: 
 http://www.analog.com/media/en/training-seminars/tutorials/MT-083.pdf 
 Harry

FormerMember · Answer

For a fixed VCC, you calculate the positive and the negative thresholds per MT-083. 
 Then subtract the two. 
 Harry

EZAdministrator · Answer

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

Thank you,
EZ Admin