LMX2592 time auto calibration 22 us. Under what conditions can be achieved.

Alexander Bakurov

Other Parts Discussed in Thread: LMX2592, LMX2592EVM, LMX2582

Hi All.

When working with LMX2592EVM I can not achieve in a given time auto calibration in datasheet LMX2592 (p.31) about 22us.
We achieve time auto calibration for at least 2 ms.

The parameters of the PLL:
mode - FRAC, Fpfd = 200 MHz, Ref in = 200 MHz, R = 1,
ACAL_FAST = 1, FCAL_FAST = 1, CAL_CLK_DIV = 0.

Other parameters LMX2592, such as spectral content, phase noise, spurs, we have measured and have no questions.
Question - only one: under what conditions can be achieved auto-calibration time about 22us.

Thanks.

over 9 years ago

0 Julian Di Matteo over 9 years ago

TI__Expert 4085 points

Hi Alexander,

Thank you for your interest in our products. We received your question and will be answering it as soon as possible. We appreciate your patience.

Best Regards,
Julian

0 Brian Wang over 9 years ago

TI__Expert 8495 points

Hi Alexander,

There are a couple registers not set as intended, that is currently not shown in the datasheet. We are updating that. And you'll be able to change it via the GUI soon as that will be updated in the next release first.

Regards,

Brian Wang

0 Christian Becker over 9 years ago in reply to Brian Wang

Prodigy 40 points

Hello everybody,

I`ve got the same issue here with the lmx2582 part and its lock timing. Are there any further information available up to now? I couldnt find any updated datasheet or software and 2ms are much too long time (needs <500µs) for my application :(

Best regards

Christian Becker

Clock & timing

Clock & timing forum

LMX2592 time auto calibration 22 us. Under what conditions can be achieved.