AD8606 bias vs. Input Common Mode

Hi Harry,

Worst cases shown in the table is specify for CM=VCC/2 as states in the table header.

AD8606 is specify as I/O R2R OPA meaning that I can work close to each of the rails. It quite suspicious that Analog-Devices omit Ibias vs CM while giving this info for all other R2R iput OPA I know of...

Noam

Hi Harry,

As I've wrote before: 

Worst cases shown in the table is specify for CM=VCC/2 as stated in the table header.

Usually due to ESD diodes and other effects, bias current is higher for CM close to rails.

So I repeat my question again... could you please provide the bias vs. CM voltage or at least specify what's the expected bias current when CM equal to VSS or VCC...

Please help me...

Noam

Noam, we have looked for the data in our archive but it is not available. We agree the graph is useful, and may add it in the future. Yes, the bias current will be higher when the Vcm in near the rails as well as higher variability with temperature and part-to-part. 

If you need bias current within ~pA range over the full operating range, please use a lower bias current part, the ADA4530-1 for example. Thank you!

http://www.analog.com/en/products/amplifiers/operational-amplifiers/low-input-bias-current-amplifiers.html

We will be collecting the Ibias vs.Vcm data for the AD8606 and it may take some time. I will let you know once it is available. Thank you for your patience!

Thanks for your help. 

I really like to stay with the AD8606 and pay 10% than the superior ADA4530-1.

More profits to me... less to ADI :-)

Thanks,

Noam