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Decreasing ADF5355 Lock Time

Question asked by Ivan-Rusov Employee on Nov 6, 2014
Latest reply on Dec 24, 2014 by Ivan-Rusov

ADF5355 datasheet contains following figure.

Lock time is very huge.

 

For example, I use PFD = 50 MHz, so:

- Timeout × ALC Timeout > 50 us × 50 MHz

- Timeout × SL Timeout > 20 us × 50 MHz

As a result:

- BCS Div = 21

- Timeout = 500

- ALC Timeout = 5

- SL Timeout = 2

When I use ADIsimPLL I get also 3 ms.

 

How could ADF5355 lock time be decreased to 100 us like ADF4350 had?

What is a minimum lock time could be achieved when ADF5355 is used?

 

Thank you in advance.

 

Regards,

Ivan

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