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ADS1191 - RLD amp

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: ADS1191

Hi all,

Would you mind if we ask ADS1191?

<Question1>
On the data sheet P10, RLDOUT shows "Analog Input", is it correct?
We quess that it is "Analog Output".

<Question2>
Please refer to following file. 
3566.20141113_ADS1191.pdf

When the Pin 28, 29, 30 connects to GND, the current increase from 1mA  to 2.5mA.
So, does it means increasing Isc?

<Question3> 
What is the RLD used for?

Could you let know us?
We need your help.

Kind regards,

Hirotaka Matsumoto

  • 0
    Guru 27585 points

    Hi team,

    We quess that your days are so busy.
    However, we appreciate if you reply to our question.

    Kind regrads,

    Hirotaka Matsumoto

  • 0
    TI__Guru 66466 points

    Hello Hirotaka-san,

    Hirotaka Matsumoto said:
    <Question1>
    On the data sheet P10, RLDOUT shows "Analog Input", is it correct?

    Yes, you are correct. The RLDOUT is an analog output from the internal RLD amplifier.

    Hirotaka Matsumoto said:
    <Question2>
    When the Pin 28, 29, 30 connects to GND, the current increase from 1mA  to 2.5mA.
    So, does it means increasing Isc?

    Pins 28, 29, and 30 should be connected to GND only if the RLD circuit will not be used in the application. For best performance, we recommend that none of the analog pins should be left floating if not in use. In addition, I recommend powering down the RLD amplifier. The increase in Isc is most likely from shorting the amplifier output to ground.

    Hirotaka Matsumoto said:
    <Question3> 
    What is the RLD used for?

    The RLD amplifier is used to drive the subject to a known DC bias relative to the ECG subsystem. In addition, it helps to improve CMRR. You can refer to the following app note for more information: http://www.ti.com/lit/pdf/sbaa188

    Best Regards,

  • 0 in reply to Ryan Andrews
    Guru 27585 points

    Ryan san

    Thank you for your reply and your cooperation!
    We got it.

    Kind regards,

    Hirotaka Matsumoto