**Q.**

What is the correct equation for the determining the corner frequencies associated with the rms averaging and the offset control loop in the AD8362 RMS Detector?

-----------------------------------------------------------------------------------------------------

**A.**

There are some errors in the Rev. D datasheet. Under the heading “TIME-DOMAIN RESPONSE OF THE CLOSED LOOP” there is an equation

f

_{LP}= 1/(CLPF x 1.1 KΩ)This is incorrect. The correct equation is:

F

_{LP}= 1/(CLPF x 1.1 KΩ x 2π)In the section “CHOOSING A VALUE FOR CLPF”, the equation is written as:

CLPF = 900 μF/(2π x F

_{LP}).This expresses the correct equation in a slightly different format

Equation 13 on page 21 of the Rev. D datasheet is also incorrect. The correct equation for determining CHPF, which sets the high-pass corner of the offset control loop is:

CHPF = 200uF/Fhp