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ADS9218: ADS9224&ADS9218 EVM noise performance

Eric Liu(SZ-FAE)
Intellectual 920 points
Part Number: ADS9218
Other Parts Discussed in Thread: ADS9224R,

Hi team,

I have simulated the ADS9224&ADS9218 in PSPICE & TINA separately ,and from our datasheet ,the SNR of the two devices ,the ads9218 should better than ads9224, but refer to the noise simulation results, the two devices with the same adc driver, the ads9224R noise is about 8.08 uV with 1 MHZ bandwidth, but the ADS9218 noise is about 8.42uV , if refer to the SNR, the noise performance of ADS9218 should be better than  ADS9224R, but it didn't like this , so I guess the noise result just contain the thermal noise without the quantization noise , so the noise of the 9224 dominate by the quantization and the ads9216 noise dominate by the thermal noise, even though the thermal noise of ads9224r better than the ads9218, the total noise of ads9224r worse than ads9218, does it right?

and I have review the simulation model of the ads9224r&ads9218, the ads9224r NVR=4.96 lower than the ADS9218 NVR=5.56

  • 0
    TI__Expert 4900 points

    Hi Eric,

    Thanks for your question! Could you please help me understand better which model is not working as expected? Is the ADS9224R model working as expected? I am working with the team member who created the ADS9218 model to make sure it functions as expected. I will have more details on the ADS9218 model next week. Until then, please let me know if I can help you with any measurements directly from our EVMs instead.

    Best,

    Samiha