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ADC of ADV7842

Question asked by Hodaka on Jun 19, 2011
Latest reply on Jun 23, 2011 by Hodaka

I have a question about ADC of ADV7842.

 

Question:

I want to get the following result of ADC.
  digital output voltage = 4095LSB

 

For that, I set the following setting for ADC.
*It take off resistor divider
*Register Setting
A_GAIN[9:0]           = 0x300
CP_MODE_GAIN_ADJ[7:0] = 0x5C

 

As a result,
When analog input voltage is about 0.66V, I got a result that digital output voltage is 4095LSB.

 

I thought that can get a result that digital output voltage is 4095LSB when analog input voltage is about 0.49V.

 

Why is this?
I made a mistake of the register setting and the other thing ?
Please teach me.

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