TRF372017: Frequency Settling at Frequency hopping

Adi Huri

Prodigy 10 points

Part Number: TRF372017
Other Parts Discussed in Thread: TRF3765

Hello,

I am working on project that support Frequency hopping,

I need to know what is the Frequency Settling to Any step size, maximum frequency error = 1 Hz.

Regards,

Adi

over 2 years ago

0 Kang Hsia over 2 years ago

TI__Guru 65944 points

Hi Adi

see datasheet:

0 Adi Huri over 2 years ago in reply to Kang Hsia

Prodigy 10 points

Hello Kang,

0 Adi Huri over 2 years ago in reply to Adi Huri

Prodigy 10 points

Hello Kang,

sorry, My mistake forgot to add Time.

I need to know what is the Frequency Settling time to Any step size for maximum frequency error = 1 Hz.

Adi

0 Kang Hsia over 2 years ago in reply to Adi Huri

TI__Guru 65944 points

Hi Adi,

I will have to check and get back to you.

0 RJ Hopper over 2 years ago in reply to Kang Hsia

TI__Mastermind 18065 points

Please check out this app note that discusses the lock time of the TRF3765 synthesizer:

TRF3765 Synthesizer Lock Time

The synthesizer in the TRF3765 is the same IP that is in the TRF3720 so the lock time analysis is synonymous. The synthesizer has 4 different VCOs. Each VCO has 64 different cap array settings. The lock time is dependent on how far the frequency is changing. The slowest change is when the VCO must be changed. The next slowest is when only the cap array is changed. The fastest is when the VCO and cap array stays the same and just the Vtune is modified. You can pre-determine the VCO and cap array settings and load them via SPI. With this approach you are not using the internal calibration scheme which saves time, but you do need to absorb the SPI communication speed.

-RJH

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TRF372017: Frequency Settling at Frequency hopping