AnsweredAssumed Answered

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.

Outcomes