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Problem Acquire 0-5V signal with AD7680


I use an ad7680 to measure 0-5V DC signal.This ADC is interfacing with PIC32MX795F512L, with SPI interface.

The supply of the ADC is 5V.

I have a problem with this ADC, when my analog signal increase 0 to 2.5 V the digital output increase 0 to 65535.

After when my signal increase from 2.5V to 5V the digital output increase 0 to 65535.

Normally , i think that the digital output should increase from 0 to 65535 when the anlog input increase 0 to 5V.

Is anyone have this problem ? Can you help me.

Excuse me for my bad english.

Best regards.

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