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ADS127L21: SDO Current Drive

Roey Tal
Prodigy 135 points
Part Number: ADS127L21

Tool/software:

Hi Team

What is the SDO current drive capability? Is it 2mA

I need to connect the SDO to opto coupler and i need 6mA is it supported?

Thanks

Roey

  • 0
    TI__Mastermind 46490 points

    Hello Roey,

    We only specify up to 2mA, but the device should be able to sink 6mA of current with about 0.5V on the output when driving low.  However, I do not recommend driving this much current as it will likely increase the noise floor of the ADC.  There is always some amount of coupling of digital noise into the inputs, and overdriving the output will further increase this noise level.  I suggest using some sort of buffer, or a small FET to drive the optocoupler LED.

    Regards,
    Keith Nicholas
    Precision ADC Applications