This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
SD24_B MSP430F67791 - What is the Effective Number of Bits and how to measure the Offset
Part Number: MSP430F67641A
Hello,Are there evidences which prove higher ENoB or effective bits by the MSP430 SD24_B and firmware post calculation?We would be glad if there are proven cases which realized, like 18bit, 20, or more accuracy.
MSP430F6721A: What is the highest noise free bits of MSP430F6721's 24 bit Delta-Sigma ADC SD24_B https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/628442 --- This thread shows 16.7bits.
MSP430F67641A: SD24_B accuracy translation to ENoB or Effective bitshttps://e2e.ti.com/support/microcontrollers/msp430/f/166/p/807313/2988788#2988788 --- My previous thread.
The SD24_B has a bit SD24SNGL.I expected we can clear the bit for "continuous", accumulate many readings, and obtain a better ENoB,like 20bits, although I could not find any articles which encourages such the accumulation.
Hideaki NambuAre there evidences which prove higher ENoB or effective bits by the MSP430 SD24_B and firmware post calculation?We would be glad if there are proven cases which realized, like 18bit, 20, or more accuracy.
While I'm not sure 18- or 20-bit accuracy can be achieved, you can improve the performance by performing software oversampling (or averaging) across a number of samples. This acts like a low pass filter and can improve performance post sampling. More details on how to do this can be found in the following thread. The trade-off here is that you have a slower effective sampling frequency but if your application can handle that, it's fine. The effective sampling rate with software oversampling would be the hardware sampling rate (Fmodulation/OSR) divided by the number of samples averaged in software before reporting the value.
[FAQ] MSP430I2020: Measuring SD ADC noise
Hideaki NambuThe SD24_B has a bit SD24SNGL.I expected we can clear the bit for "continuous", accumulate many readings, and obtain a better ENoB,like 20bits, although I could not find any articles which encourages such the accumulation.
Continuous sampling may improve the results very slightly since the decimation filter will be continuously full and you won't need to wait for the 4th sample for the results to be accurate.
Check out our new Answers to Common Sigma-Delta ADC Questions on MSP MCUs app note!
NOTE: Replies will be delayed due to US holiday.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.