Hello ADI,

I have a question.

Could you tell me the exact value of the "register R" in the "Figure 16. Analog Input Block" on p.18 of ADAU1977 Data Sheet.

Thank you

Best Regards,

Yuta Mihara

Hello ADI,

I have a question.

Could you tell me the exact value of the "register R" in the "Figure 16. Analog Input Block" on p.18 of ADAU1977 Data Sheet.

Thank you

Best Regards,

Yuta Mihara

Hello again Rajeev,

Thank you so much for answering.

I have further related questions.

On page 4 of ADAU1977 data sheet, it says ADC, Input Resistance, Single-Ended, Between AINxp and AINxN is 25kΩ

Also, you mentioned that R of Figure 16 on page 18 is 14.3kΩ

I would like to know the association between those value of Rs and how you calculated it.

Thank you very much

Yuta Mihara

Hi Yuta,The input resistance is the result of the network analysis for input attenuator. This turns out to be around 35.75kohm. There is another circuit in parallel which has 100kohm resistance. The effective theoretical value would be 26.335koh. With process variation accounted for the min value would be 25kohm.

Thanks

Rajeev

Hi Yuta,

The input resistance is the result of the network analysis for input attenuator. This turns out to be around 35.75kohm. There is another circuit in parallel which has 100kohm resistance. The effective theoretical value would be 26.335koh. With process variation accounted for the min value would be 25kohm.

Thanks

Rajeev