This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Are ADS8341EB Vcc Pins internally connected?

Hi,

I have a question about TI's ADS8341EB regarding VCC and Vref:

  1. Are pin 1 (VCC), 8 (VREF), and 9(VCC) are internally interconnected or isolated? – What are their functions to internal circuitry ?
  2. Are pin 6 (COM) and GND (10, 11) are internally interconnected or isolated?

 

I am investigating the possibility of driving the VCC and Vref on two different rails and ground planes. However would like to make sure that I am not creating ground loops in my design.

In advance, thank you for your help.

TIg

  • Hello TIg,

    I verified through measurement that Pins 1 and 9 are not internally connected and need to be externally shorted to VCC as shown in Figure 1. I believe these are independent power supplies for the ADC's analog and digital sections.

    On the other hand, VREF is functionally independent of VCC (over its valid range). VREF sets the ADC's analog input range and has to be provided by the user in addition to VCC, as shown in Figure 1. Naturally, the two are not internally connected except by an internal clamp that keeps VREF < VCC. 

    Similarly, GND and COM are independent signals and are not internally connected.

    Best Regards,
    Harsha