TRF3765: TRF3765 and LMX2582 Differences

Preethi J

Part Number: TRF3765
Other Parts Discussed in Thread: LMX2582

Hi Team,

We are in the process of selecting a PLL with VCO that can generate an output frequency programmable from 900 MHz to 2.45 GHz to achieve low phase noise and jitter, we are evaluating two potential parts: LMX2582 and TRF3765. Both seem suitable for our application based on the parametric search we did.

1. Are both these parts recommended for new design?

2. TRF3765 has an evaluation kit which is very useful for our design. It also provides detailed information. This makes the TRF3765 an appealing option. But, when comparing jitter specifications, LMX2582 has better performance over TRF3765. Jitter, being a critical parameter, positions LMX2582 as a compelling choice for us. This makes our selection process a little challenging. Can you please elaborate on the differences between LMX2582 and TRF3765?

Thanks

10 months ago

0 Kang Hsia 10 months ago

TI__Guru 72804 points

Hello,

Both TRF3765 and LMX2582 are available for new design. The LMX2582 definitely has better performance. This will depend on your application. If you can describe your application, the team will be better suited to answer the questions on the differences pertaining to your applications

-Kang

0 Preethi J 10 months ago in reply to Kang Hsia

Prodigy 90 points

We want to make a signal generator that's programmable from 900MHz to 2.45GHz. Very low phase noise/jitter, good phase margin and good stability over temperature variations are crucial parameters. While the TRF3765 has detailed information over phase noise with temperature, the LMX2582 datasheet has limited information. Is LMX2582 suitable for a stable signal generator application that's subject to temperature variations?

0 Kang Hsia 10 months ago in reply to Preethi J

TI__Guru 72804 points

Preethi,

I will let the clocking team to get back to you on your end equipment. They are better suited for the application (i.e. signal generator) that you are designing.

-Kang

0 vicente flores prado 10 months ago in reply to Preethi J

TI__Mastermind 22401 points

Hello Preethi,
Can you quantify your design requirements if possible?
Do you value in band or device noise floor? Do you have a certain RMS jitter requirement over a defined integration band/
You mention good phase margin margin, what is your requirement? Phase margin is a parameter heavily dependent on your loop filter - Please note you can use PLLatinumSim to simulate your phase noise/jitter, phase noise, SNR, spurs etc. Are there any other features you require such as fast switching time or frequency hopping?

Please note the LMX2582 DS is characterized over PVT thus if you have achieved lock, you will maintain lock over temperature up till 125 deg C.