PGA900: Question about VBRGN connection

Hi Go,

VBRGN is connected to the internal device ground (GND). You can connect the resistor bridge using the VBRGN pin, or connect it to GND externally. Either way will work the same.

Regards,

Hi, Scott

Thank you for your advice.

So it's my understanding that you don't recommend the resistor bridge uses analog ground(AVSS),is it right?

Regards,

Go

It's fine to do that. AVSS should be connected to all the other grounds on the board anyway.

Hi, Scott

Thank you for your comment.

Is there any advantage that the resistor bridge use the VBRGN pin compare with using extarnal GND?

In other words, is there any disadvantage to use external GND?

Thanks

Go

Hi Go,

There is no disadvantage to an external ground.

Regards,

Hi, Scott

Thank you for your comment.

I'd like to ask about the functional Block diagram in D/S Page 25 in a little more detail.

As you mentioned before, VBRGN is connected to the internal device ground (GND).

but I think VBRGN should be connected to AVSS because the SENSOR VOLTAGE SUPPLY block is powered by AVDD In the functional Block diagram.

Could you tell me that which ground-related pin(means AVSS/DVSS/GND) is connected to each block described in the functional Block diagram in D/S Page 25?

Regards,

Go