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Hi:
I have many legacy boards that use an 16-bit ADS8401 sampling at 1 MHz that is performing poorly as far as its SNR. The PDS says SNRAD of the ADS8401 is about 85dB. In our legacy system, it unfortunately measures about 60dB, presumably due to layout and pre-drive circuitry issues.
1. Why is the ADS8401 discontinued or not recommended for new designs? Was this a business decision or a technical one? If technical, what were the issues with the chip that led to its replacement by the ADS8405 or others like it?
2. What drive amplifier is recommended for the ADS8401? The datasheet doesn't seem to show one.
3. What does it mean to have 16 bits of resolution but 15 bits of no miising codes(NMC)? What's the NMC term anyways?
Regards,
David
Hi David,
How are you going about testing the SNR? There are many things that could be occurring to give you a poor SNR. If you have a picture, or better yet, the time-domain raw data (code outputs) of the ADS8401 then we can look at the FFT of the output signal and have a good idea of where your noise is coming from. Some other questions I have regarding your application would be:
Regarding your questions:
Best regards,
Chris