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Gain adjustment Question for your AD8330

Question asked by Kaos on Feb 19, 2015
Latest reply on Feb 25, 2015 by Kaos

Dear Sir/Madam,


Our customer brought the following question about AD8330 Gain adjustment.


When Vmag is open, Vout show the following formlra.


V OUT  = 2 × G IN  × V IN  × V MAG 


Vmag=open means Vmag=0.5V default setting, I see.

But when we adjust the CNTR-pin, then Vout can adjust from the following explanation on your datasheet page-19.


~~~ However, some circumstances require a small change in this voltage, and a resistor from CNTR to ground can lower this voltage, whereas a resistor to the supply raises it.

On the other hand, this pin can be driven by an external voltage source to set the common-mode level to satisfy, for example, the needs of a following ADC.

Any value from 0.5 V above ground to 0.5 V below the supply is permissible. ~~~


So does this(adjust the CNTR-pin) mean that GIN is adjusted by CNTR-pin voltage, correct?


Thanks Kaos.