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Analog and Digital loopback

shruthi v
Intellectual 435 points

Hi,


Can anyone tell me the difference between Analog and Digital loopback in general.

When to use analog loopback / Digital Loopback ?


Thanks and Regards,

Shruthi

  • 0
    TI__Guru**** 190786 points
    Hi Shruthi,

    Analog loop back will include the I/O buffers while the digital loop back will not. The digital loopback is done inside the chip bypassing the I/O buffers. This is the biggest difference. If you choose the analog loopback you will also exercise and test the I/O buffers. Let's say if the I/O buffer is bad, then a analog loopback test will detect the fault. However, it depends on how is the MCU is connected to the rest of the devices on your devices. In an analog loopback test if you are driving a signal to an I/O where this I/O is connected and also being driven by another device on the board then you will have a driving conflict. Doing a digital loopback as stated is done inside the chip excluding the I/O path and will not have the problem. So there is some tradeoff between using either one.