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LMX2594EVM: LMX2492EVM & LMX2594EVM

Amit kumar
Prodigy 90 points
Part Number: LMX2594EVM
Other Parts Discussed in Thread: LMX2492EVM, , LMX2594, PLLATINUMSIM-SW, LMX2492

Tool/software:

Hi Texas team,

I am using LMX2492EVM and LMX2594EVM board for our application where we need Ramp signal which bandwidth will be 1.5 GHz BW. We want to explore large BW option. I have few questions about two boards which I have mentioned below. Let me know if any information is missing from my side.

1. LMX2492EVM: Can this board can generate 1.5 GHz BW Chirp signal by some modification in the board? 

2. LMX2594EVM: 

a. Can this board generate 1.5 GHz BW Chirp signal (Ramp) in X-band by some configuration we have to set it in on TICS Pro.

b. Can this board generate 1.5 GHz BW Chirp signal in X-band by some modification in the board? 

c. Internal Crystal Oscillator footprint is present in EVM board, can we use LMX2492EVM Oscillator here?

Thank you

  • 0
    TI__Guru** 108150 points

    Hi Amit,

    1. The onboard VCO can support 1.5GHz tuning range with >5V charge pump voltage supply. You can modify the EVM to accept a higher CP voltage.

    2. 1.5GHz tuning range between 8G and 12GHz is possible with LMX2594. However, it is not a linear frequency ramp as the VCO has to be calibration a couple of times during ramping. No modification to the EVM is required. The onboard XO in LMX2492EVM fits the layout in LMX2594.

  • 0 in reply to Noel Fung
    Prodigy 90 points

    Hi Noel Fung,

    Two Question related to above reply

    1. Your Statement 1 is valid for both the boards (LMX2492EVM & LMX2594EVM)? 

    2. In statement 1 means Higher charge pump voltage will come through after loop filter design. And for designing, simulation can be done on PLLATINUMSIM-SW.

    Correct me if have understood wrong.

  • 0 in reply to Amit kumar
    TI__Guru** 108150 points

    Hi Amit,

    1. refers to Q1.

    2. refers to Q2. 

    LMX2492EVM onboard VCO requires 12V control voltage in order to operate at higher output frequency. LMX2492 cannot output 12V tuning voltage, we need to use active loop filter.

    The EVM supports active loop filter.