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Power Consumptions of the ADS1252, ADS1256, ADS1262, & ADS1281 vs. Data Rate

Hirotaka Matsumoto
Guru 27525 points
Other Parts Discussed in Thread: ADS1262, ADS1257, ADS1252, ADS1281, ADS1256, ADS1248

Hi all,

Would you mind if we ask electricity consumption in case of 200SPS using ADS1252, ADS1257, ADS1262 or ADS1281?
We don't have the data about these.

So, could you let us know these?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 44550 points

    Hi Hirotaka,

    The data rate will not have much affect on the power consumption (assuming you are controlling the data rate by the digital filter decimation and not by the master clock frequency).

    • That said, the ADS1252's data rate is only controlled by the clock frequency. At a clock frequency of 76.8kHz (200 SPS), the power dissipation of the ADS1252 is about 30mW.

    • Did you happen to mean the ADS1256? The power dissipation will depend mainly on the PGA gain and buffer setting. At gains of 32 and 64 with the buffer enabled, the power dissipation of the ADS1256 is at its highest around 180 mW. All other configurations will have power dissipation between 50-100mW (typically 50mW when the buffer is disabled and 100mW when the buffer is enabled).

    • The ADS1262's power dissipation will be close to 25mW for all configurations.

    • The ADS1281's power consumption is about 12mW for all configurations.

    I hope that helps!

    Best Regards,
    Chris

  • 0 in reply to Christopher Hall
    Guru 27525 points

    Chris san,

    Thank you for your reply!

    Compared with comeptetion ADI7172-2(please refer to the following datasheet),  the power dissipation is 19mW.
    http://www.analog.com/media/en/technical-documentation/data-sheets/AD7172-2.pdf

    Certainly, ADS1281 is good about the power dissipation.
    However, our customer needs over 4inputs.
    If you have some advice, could you let us know it?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru* 92715 points
    Hirotaka-san,


    One other possibility would be the ADS1248 if you need four channels. This device has an input multiplexer capable of four independent channels. If the device is run at 1kSPS or 2kSPS, you could get measurements for each input at faster than 200SPS. Note that you would be cycling through each of the channels.

    There would be some reduction in resolution, but it could work depending on your customer's requirements. The power for this device should be less than the given devices. It is outlined in the datasheet and you can find the analog and digital currents based on the data rate.


    Joseph Wu