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Observer
Observer
3,551 Views
Registered: ‎02-21-2011

query about max voltage that can be applied to adc on spartan 3e

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I would like to know what is the maximum voltage that can be applied to the analog capture circuit on spartan 3e starter kit which includes the ltc6912 and the ltc1407a. I want to apply 4.5 v to the input. Is it possible?

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Anonymous
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The analog capture circuit inputs are connected operational amplifier (LTC6912). The data sheet of LTC6912 can be found in http://cds.linear.com/docs/Datasheet/6912fa.pdf .

In Spartan-3E starter kit circuit LTC6912 supply voltage pin connected to 3.3V supply. So you can not apply 4.5V to the input.for correct operation

 

Thanks

Mahesh

 

 

Kindly accept any one of the post which you think more useful to you

 

To forum moderator: Please KUDO

 

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Instructor
Instructor
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Registered: ‎07-21-2009

If you can't search for a datasheet, read it, and understand it...  you've got troubles ahead.

 

LTC6912  input range is rail to rail.  VCC rail is 3.3V on Starter Kit board, so that's your limit (3.3V).

LTC1407  fed by LTC6912, so specs on this part aren't that interesting for your purposes.

I want to apply 4.5 v to the input. Is it possible?

Yes, but device failure will likely result, and you'll be outside the "linear" input range.  So the answer is really NO.

 

-- Bob Elkind

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Highlighted
Anonymous
Not applicable
4,437 Views

The analog capture circuit inputs are connected operational amplifier (LTC6912). The data sheet of LTC6912 can be found in http://cds.linear.com/docs/Datasheet/6912fa.pdf .

In Spartan-3E starter kit circuit LTC6912 supply voltage pin connected to 3.3V supply. So you can not apply 4.5V to the input.for correct operation

 

Thanks

Mahesh

 

 

Kindly accept any one of the post which you think more useful to you

 

To forum moderator: Please KUDO

 

View solution in original post

0 Kudos