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ADS131E08: 64 KSPS Data Rate setting

ANJAN KUMAR LAKKIMSETTI
Prodigy 100 points
Part Number: ADS131E08

Hi Ti,

i am trying to set config1 register to 0x90 to make ADC to run at 64ksps Data rate. But still ADC is running at 32ksps.

I have tried 8,16,32ksps those looks to be fine DRDY is coming as expected. But when i tried to run ADC at 64ksps by writing to Config1 register it is still running at 32ksps.

Any additional registers need to be written to make ADC run at 64ksps? 

Thanks
Anjan.

  • 0
    TI__Mastermind 33010 points

    Hi ANJAN,

    All registers are listed in the table 10 of datasheet. 

    First, 0x98 should be written into the CONFIG1 register to select a data rate except the default 32ksps. Also, make sure your data size is 16-bit.

    Second, if the above advice does not work. I would suggest you to check two things: 

    1. Check if the data is correctly written into the device. I would suggest to read the register back to verify if the writing of the register setting the data rate is correct.
    2. If you're using a scope to check the /DRDY signal, I would suggest you to make sure that the scope resolution is enough to capture the /DRDY signal. If the /DRDY pulse is narrow, then the scope resolution may miss all of the output pulses. You should be able to see the /DRDY signals at the 32kSPS and 64kSPS data rates every 31us and 15.6us respectively.

    Regards,

    Dale