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LMX2594: Trigger for automatic ramp

AY
Prodigy 180 points
Part Number: LMX2594
Other Parts Discussed in Thread: LMX2491

Hi, 

Is it possible to start an automatic ramp with an external trigger (eg. rising edge) and generate a continuous triangle chirp until the ramp is disabled?

I was thinking to use Trigger A for RAMP0_NEXT_TRIG to initiate waveform and then the triangle waveform should run continuously. However, in order to get it to run continuously, I would need to set the RAMP0_NEXT_TRIG to TOC Timeout. Which means that this method would not work. Is there any way to trigger the automatic signal ramp?  

  • 0
    TI__Mastermind 28031 points
    AY,

    With 2 ramps, you are limited and I don't think you cn do this.

    For instance, you could trigger RAMP0 with the pin and then have RAMP1_NEXT = Ramp1, but this can only do a sawtooth, not a triangle wave.

    The LMX2491/92 can do this and has 8 ramps, but this does not have an integrated VCO.

    Also, I notice that you are sweeping 95 MHz, so be aware that your VCO will likely need to calibrate in the middle of the ramp, especially at hot temperature.

    Regards,
    Dean