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LMX2594: Regarding multiple programmable output channels

Maitry Khambhati
Intellectual 450 points
Part Number: LMX2594
Other Parts Discussed in Thread: LMK03328

Hello support team,

I am looking for the RF synthesizer with the multiple channels that can be individually programmed to independent frequencies. my freq requirement is up to 6 GHz and multiple channels requirement is dual or quad. 

also, is it possible to have variable output amplitude as well?

request you to guide and support on the suitable part number of RF synthesizer if it is possible.

  • 0
    TI__Guru** 107660 points

    Hi Maitry,

    Although modern RF synthesizer has multiple VCOs in the chip, only one VCO can be active at a time. In other words, every RF synthesizer has one frequency domain output even though it may has two or more output channels. 

    Short answer to you, we don't have the product you are looking for, and I believe this product is not available in the market. 

    We do have some clock devices, such as LMK03328, which has two PLL/VCO in the chip to support two frequency domains output, however the output is limited to 1GHz. 

  • 0 in reply to Noel Fung
    Intellectual 450 points

    Hi Noel, 

    Thank you for your quick response.

    So, In order to have multiple output channels with different independent frequency and different amplitude levels, I think I need to use external Digital step attenuator along with the frequency divider, right? 

  • 0 in reply to Maitry Khambhati
    TI__Guru** 107660 points

    Hi Maitry,

    Yes, you can use variable attenuator or variable gain amplifier to adjust the RF power.

    To get different frequency, if all the output channel frequencies have the same frequency domain, yes, we can use frequency divider to get the desired frequencies. For example, you can get 6.4G, 3.2G, 1.6GHz, ..., etc. with frequency divider. However, if you want 6.4G, 3.2G, 5.1G, 1.7GHz, etc, you need multiple synthesizers to support 6.4G, 3.2GHz & 6.8G, 1.7GHz. 

  • 0 in reply to Noel Fung
    Intellectual 450 points

    Hi,

    thank you for the response.

    Is it possible to have multi channel frequency divider (with 4 output with programmable independent divider)?

    One more thing that if the requirement is to have same frequency for all multiple outputs , then it is possible to use the power splitter( 4 way) as well phase shifter (to vary the phase in one of the output), right? please suggest weather this will be the suitable option?

  • +1 in reply to Maitry Khambhati
    TI__Guru** 107660 points

    Hi Maitry,

    If there exist a multi-channel RF frequency divider, yes, that will be perfect to you. Unfortunately, TI does not have this product.

    A power splitter can definitely fanout a RF signal to multiple copies. If you need to control their phases, phase shifter can do the job.