AD8541 Large Signal Voltage Gain 's Vs dependency

Hi, moto.

Why do you need to know the "Avo vs Vs" feature? Is this critical to your application?

Regards,

Anna

Dear Anna

I beleve in ADI datasheet.

This Avo feature is changed by Vs drastic.

So I would like to know changing point.

Regards

moto

Dear Anna Datasheet say "The AD8541/AD8542/AD8544 are optimized to maintain high gains at lower supply voltages, making them useful for active filters and gain stages. " Does it control by the switch? Regards moto

Hi, moto.

According to the applications engineer of AD8541,

"The AD854x data sheet  is a little surprising to me as well. We usually change Vo conditions with respect to different supply voltage. For example, take a look at the ADA4661-2.

http://www.analog.com/static/imported-files/data_sheets/ADA4661-2.pdf

Vout is set to be 1.5V from the rails.

There is no strict rule of determining Vo as far as I know. Vos vs Vout graph usually suffers and takes off at both ends. So, having a narrower range of Vout usually gives a better Avo number. In most of our newer data sheets, Vo scales with Vsy. We would choose Vo to be 0.5V – 1.5V away from the rails and measure delta Vout / delta Vos."

Hope this helps.

Regards,

Anna

Dear Anna

Thank you very much for your help.

Avo will change between  Vs=3.0V to 5.0V, I think.

Is it OK to use at Vs=4.0V ? Is it unstable?

Avo was changed only 10 times .

It might not a big change...

Could you make sure that the device is stable between 3.0 and 5.0V?

Regards

moto

Hi, moto.

AD8541 is stable with supplies between 3V and 5V. Just take note that the Avo is not scaled up to the rails because there is always a headroom from the supplies of at least 500mV.

Hope this helps. Happy New Year!

Regards,

Anna