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TSW1400EVM: Reduce resolution of output data

Sajad Rahmdel
Expert 1705 points

Part Number: TSW1400EVM

Hello,

We are using AFE5809EVM + TSW1400EVM to capture data from a receive path of a sonar system. As you know, AFE5809 has 12bit, 14bit, and 16bit resolutions. This leads to very high number of samples captured by our TSW1400EVM. For example, we generated a pulse, transmit it inside sea water and received the echo. The depth of sea floor is around 500 meters. TSW1400EVM captured millions of samples for only one pulse sent and the echo received. 

Is there anyway to reduce the resolution, or somehow reduce the number of samples per second in TSW1400EVM?

  • 0
    TI__Guru* 91947 points

    Sajad,

    The only way to reduce the samples per second is to lower the ADC sample rate. If the software could capture every 2nd sample or every 4rth sample, would this help you with your application? If so, I will check with the software development team to see if we can implement this function. Another possible option is to lower the number of samples captured per channel and use an external trigger to start the capture.

    Regards,

    Jim 

  • 0 in reply to jim s
    Expert 1705 points
    Jim,
    If HSDC Pro could capture every 4th sample (we could choose any custom value), that would be wonderful.
    Lowering number of samples per channel is not possible. When we send a pulse to the sea, we need to listen for the echo, which means we cannot simply lower the number of samples that is captured.
  • 0 in reply to Sajad Rahmdel
    TI__Guru* 91947 points

    Sajad,

    This can be handled by applying channel pattern shown below under "[Version 1.0]" section of INI file. This will show only one sample per channel in HSDC pro and skip 3 samples per channel.

     

    Channel Pattern=1,2,3,4,5,6,7,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

     

     

     

     

    Regards,

     

    Jim