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Question for your AD7762 Sigma delta ADC

Question asked by Kaos on Aug 3, 2015
Latest reply on Aug 10, 2015 by jcolao

Dear Sir/Madam,

 

Our customer is designing with your AD7762 sigma delta ADC.

So I have a question as following.

Do you have the waiting time as for after release the power down and the diff-amp power down?

After below step-4, durling 540 to 600usec he could not get the correct value.

Checking DValid was correct.

Why we cannot catch the corret value for 540-600usec?

 

step-1

Reset

 

step-2

Write 0x0022 to the control register-2

Release the power down and the diff-amp power down

 

step-3

Write 0x000B to the control register-1

Input value : Fixed

 

step-4

Read the ADC data

 

Condition

external clock=19.909MHz

External power voltage ,and Vref coltage were correct.

 

Thanks Kaos

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