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LMX2492EVM: DLY ramp function problem

Guillaume Motyl
Prodigy 10 points
Part Number: LMX2492EVM

Hello,

I use the LMX2492EVM and TICS PRO to generate a chirp composed by two ramps :

  • RAMP0 : 9300 --> 9350 MHz during 100 us, then,
  • RAMP1 : 9350 --> 9400 MHz during 600 us, then,
  • RAMP0 etc.

I use the TRIG1 pin to output RAMP0 state (+V active; 0V inactive).

As expected, the TRIG1 pin generate +V during 100 us and then 0V during the next 600 us. 

But when i check the DLY function on RAMP1, i don't have expected ramp profil on TRIG1 pin : +V during 100 us and then 0V during the next 1,2 ms.

Can somebody could explain me this function DLY ? 

Thank you in advance,

Regards,

Guillaume Motyl

  • 0
    TI__Mastermind 27911 points

    Guillaume,

    On TICSPro, you can mouse over any bit and it will tell you the function in content window in the lower left corner.

    In the case of this bit, it essentially doubles teh length of the ramp.   What it is doing is if this bit is checked, then the ramp is clocked every two phase detector cycles instead of every phase detector cycles.  It is useful in cases where the RAMP_LEN word is not long enough.

    Regards,
    Dean