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AWR1843: Bypassing the ADC

Errol Leon6
Expert 5850 points
Part Number: AWR1843

Hello team,

For the AWR1843.  In this application, I have 4 of these devices in the system.  The application does not have a specific more aggressive requirement for angular resolution, but I have the 1243 device as a placeholder.

 

1. Can you bypass the ADC and put the I and Q data directly into the LVDS bus to send to an external device?

2. From the mmWaveEstimator – can someone elaborate on the term “ Measurement Rate (Hz)” ?  I have been assuming frame-rate to position this for a display refresh rate.

Thanks!

Errol

 

  • 0
    TI__Guru*** 149044 points
    Hi,

    1. Yes, this is possible. System details would have to be discussed. The LVDS cable has a limited length (few centimeters). The LVDS would have to be converted to another format (CSI2, Ethernet...) for longer length.
    We usually recommend using the DCA1000 capture card to capture raw data.

    2. Measurement Rate refers to the frame rate. This defines the periodicity of the frame. For example if the application requires to have a measurement 10 times/second (Hz), then the frame time should be programmed to be 100ms

    Thank you
    Cesar
  • 0 in reply to Cesar
    TI__Expert 5850 points
    Hi Cesar,

    Are there any additional information/examples regarding this bypass?

    If the customer bypasses the internal ADC at 12Mbps rate, they can sample faster with an external device, but if this comes out on the LVDS interface, how is the data formatted and put out on the LVDS bus. The customer wants to better understand the data coming out on the LVDS bus, so they know what to do with an external FPGA.

    The customer looked at the schematics and user guide on the DCA1000 board, but the LVDS information coming directly off the IF interface was not discussed in the docs. Do we have anything they can reference?

    Thank you for your support!
    Errol
  • 0 in reply to Errol Leon6
    TI__Guru*** 149044 points
    Hi,

    Note that this is NOT bypassing the ADC. The LVDS can transfer the ADC data.

    Sorry if this was not clear

    The format of the ADC data coming on the LVDS bus is described in the mmwave studio user's guide

    C:\ti\mmwave_studio_02_00_00_02\docs\mmwave_studio_user_guide.pdf



    Thank you
    Cesar