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ADS9224R: Device Recommendation

Dajon McGill
Expert 4730 points
Part Number: ADS9224R
Other Parts Discussed in Thread: ADS9226, ADS9234R

Hey Team,

I have a customer that is trying to find a low noise 16-bit adc that runs at roughly 3 MSPS. For now, they are using the ADS9224R.

Might there be a cheaper or potentially better performance chip for these specifications?

Best,
Dajon McGill

  • 0
    TI__Guru 57296 points

    Hi Dajon,

    Thanks for your post.

    Could you give us some insight into how the ADS9224R is being used? If they don't need simultaneous sampling channels, that may give us other options.

    "Cheaper" might mean giving up some features or relaxing some specifications. What specs are important to keep or improve?

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    TI__Expert 4730 points

    Hey Ryan,

    The most important features would be:

    • Simultaneous sampling (A large part of why this part was chosen)
    • 3 Maps (approx.)
    • SPI output
    • Very low noise

    They could do without the differential feature if needed.

    I hope this helps narrow down potential recommendations!

    Thanks,
    Dajon McGill

  • 0 in reply to Dajon McGill
    TI__Guru 57296 points

    Hello Dajon,

    The sampling rate and noise requirements you provided are very vague. How low is "low noise?" A minimum SNR target would be helpful here.

    I believe the ADS92xx family would be the best family of products to suggest if the customer is keen on a multi-channel, simultaneous-sampling solution. The devices below range from 2.048 MSPS - 3.5 MSPS maximum throughput. They can save some cost by sacrificing resolution (ADS9234R) or by sacrificing data rate (ADS9226). The noise performance of the ADS9226 is only 3.5 dB lower due to the decreased full-scale range with a pseudo-differential input.

    Apart from these devices, we would need to consider single channel ADCs that can be synchronized with an common CONVST signal. However, this increases the complexity of the connections to the host processor.

    Best regards,