• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 22 subscribers
  • Views 185 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMX2820: About LMX2820 Instant Calibration

TI-CSC
Genius 16180 points

Part Number: LMX2820

Hello E2E Experts,

Instant calibration mode can be used to shorten the lock time. However, when I need to change the frequency in 1 MHz steps within the 10 GHz to 20 GHz range, can I use this mode?

I am not sure if the initial settings in Instant Calibration provide the VCO core (VCO_SEL), band (VCO_CAPCTRL), and amplitude (VCO_DACISET) for each frequency I require. 

Regards,

TICSC

  • 0
    TI__Guru** 120110 points

    Hi There,

    After the PLL is locked, changing the frequency by 1MHz does not need any kind of calibration. However, if the accumulated frequency change reach 100MHz (approx.), then a vco calibration has to be taken. 

    InstCal requires an one-time calibration. After that, changing frequency does not need calibration, the required VCO_SEL, CAPCTRL and DACISET value is automatically applied to the device.