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PGA 280 Help please.

Hi

I am using PGA280 in one of my application.

The PGA  supplies are like below :

VSP=+15V, VSN=-15v and VSOP = +5v , VSON= GND , DVDD=3.3V, VCOM =2.5V.

Since PGA is rail to rail , I am trying to measure +15v and +10V  Analog signal with a gain of 1/8

with input of +10v , I am getting the proper output of 1.25V

But with +15v input , I am supposed to get 1.875V, but i am geeting only 1.680V. I dont know where the problem is. Please help.

While PGA280 Works for all other lower voltage.

With much thanks.

Manjunath

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