AD7767 SNR vs ODR

Hi All,


Sigma-Delta ADC such as AD7794 has data of SNR vs ODR (Output Data Rate) performance in its data sheet.

Can I see the same SNR (or ENOB) vs ODR data of the AD7767 ADC?


Best Regards,


  • 0
    •  Analog Employees 
    on Jan 31, 2017 11:40 PM

    Hi Ricky,

       Good day.

       The AD7767 has 3 parts AD7767, AD7767-1 and AD7767-2. Each of this part has its own decimation rate. The output data rate is derived form MCLK frequency/decimation rate. The implicit way to look at SNR vs ODR, would be the figure 20 of the datasheet. This is a graph of SNR vs MCLK. Now each represent an ODR. The ODR of 32khz has the best SNR result at around ~113dB.

       Are you looking for a particular ODR for your application?  May I now the application that you are trying to build. On the first page of the datasheet, there is a related devices section that showed other products that are similar and have variable decimation rate. You can also try to check these parts, most of it are sigma delta ADCs.



  • Hi jcorao-san,


    Thank you for your comment.

    Now I understood that the decimation rate of AD7767, AD7767-1 and AD7767-2 are fixed.

    I will choose different type listed in the data sheet which you suggested.

    Thank you for your help,