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AFE0064: ADC for AFE0064

Chenkai Wang
Prodigy 190 points
Part Number: AFE0064
Other Parts Discussed in Thread: THS10064, ADS8363, AFE2256

Hi, Team 

do you have any guideline or recommendation for selecting ADC for AFE0064? I have some trouble understanding the relationship between the data transfer rate in AFE0064 and the data sampling rate in the following ADC. Is it ok to make the data transfer rate equal to the data sampling rate? For example, I connect the outputs of AFE0064 to an ADC, THS10064. In AFE0064, I set it in sequential mode, and I use a 6 MHz clock signal. The data transfer rate will be 3 MHz. Do you think the outputs from AFE0064 can be sampled by THS10064? Which conversion mode should I use in THS10064 (single conversion mode or continuous conversion mode)?

The reason I choose THS10064 in the previous example is that this is the ADC with 2 differential inputs, multiplexed configuration, and highest sampling rate. If I want to operate AFE0064 at the maximum data transfer rate (7.5 MHz), do you have any suggestions how to convert the analog output signal to digital signal?

Thank you!

  • 0
    TI__Prodigy 620 points

    Hi,

    1. The AFE0064 ADC selection will depend up speed, accuracy and noise requirement.
    2. The data transfer rate of AFE0064 can be made equal to sampling rate of the ADC.
    3. The THS100064 is a 10-bit ADC with 60 DB SNR. What are your noise and full scale signal requirements? There is possibility that if you application noise could get limited by ADC noise floor. For low-noise applications, ADS8363 (93 dB SNR) can be used.
    4. Also, note that, the when ADC is selected, to achieve optimal performance, the device full scale should match to ADC full scale.

    TI also has next generation devices of AFE0064 with on-chip ADC. The AFE2256 is a 256 channel, ultra-low noise, high speed, high performance charge-to-digital converter. It has integrated 16-bit ADCs. It can optimize overall dynamic range, noise and power consumption of the system. Instead of using discrete components, you could also check if AFE2256 can be used in your system.