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AD8338 Noise

Question asked by joman on Mar 2, 2016
Latest reply on Mar 18, 2016 by joman

Hi,

I am using AD8338 VGA in a non-AGC application (DETO pin connected to COMM, AGC connected to VREF) with my input voltage source connected at INPD and INMD via 1.2Kohm resistors (INPR connected to INMR).

 

I wish to calculate the input referred noise of my circuit. Do I read the input referred noise of AD8338 directly from the input referred noise graph in the data sheet, or do I have to work backwards from the data sheet output referred noise using the gain of my particular setup?

 

Also, does enabling the OFSN pin affect noise levels?

 

Thanks,

joman

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