ADUM141ES Output Impedance

Hi, 

The ADuM141ES is derived from the ADuM141E industrial grade. There are probably some differences between package parasitics but might be good enough for your purpose.  

The output stage is push-pull CMOS. Its not meant to drive a 50Ω load and the design is likely violating the abs max average current of ±10mA on the output pin. 

Try reaching out to technical support if you need additional support on the ADuM141ES. https://www.analog.com/en/support/technical-support.html# 

Regards,

Jason

Hi, 

The ADuM141ES is derived from the ADuM141E industrial grade. There are probably some differences between package parasitics but might be good enough for your purpose.  

The output stage is push-pull CMOS. Its not meant to drive a 50Ω load and the design is likely violating the abs max average current of ±10mA on the output pin. 

Try reaching out to technical support if you need additional support on the ADuM141ES. https://www.analog.com/en/support/technical-support.html# 

Regards,

Jason

Thanks for the fast reply Jason! I'm a little confused about your comment stating that it's not meant to drive a 50Ω load and violating the max pin current. This is a high-speed device, so what characteristic impedance is it intended to drive into?

Also, we only see this when operating at 5V on the VDD2 side. The other side is at 3.3V (VDD1) with a 33.2Ω source term. and we don't see any non-monotonicities.

I will also reach out to tech support separately.

Hi, 

Typically a standard data isolator is driving a high impedance CMOS input. The output impedance is in 60-80Ω range but loading the output heavily will probably pull the output high level below what's needed for 3.3V or 5V CMOS logic. The LEO parts are there own expertise which is why I recommend contacting technical support, but the abs max rating I'm referring to is "Output current per pin" in section 4.1   

Regards,

Jason