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LMX2594: Lock time

Kailyn Chen
Genius 9560 points
Part Number: LMX2594

Hello，

Above shows a voltage-controlled voltage with an SPI clock frequency of 25MHz, a SPI clock on the yellow line and the green line is VCO voltage of LMX 2594. During frequency hopping  there is a large fluctuation of VCO voltage temperature after 100us (red marked circle).Each frequency point has this except that the middle interval is different. Why did this happen?

2. 《Streamline RF Synthesizer VCO Calibration and Optimize PLL Lock Time 》described the lock-up time  is less than 50us,I am currently installing VCO auto-correction, partial assist mode , and full assist  mode for separate tests, the VCO frequency hopping time can be around 50us within the band, and the span hop lock time is not certain. The maximum time is around 170us. May I know what should be paid attention to ? 

Best regards

Kailyn 

  • 0
    TI__Genius 12560 points

    Hi Kailyn,

    Can you elaborate more on the green line in above image, is it Vtune voltage or lock detect level?

    I assume, you are following the procedure for full assist mode during frequency hopping. Could you able to share the used config file and procedure to have look on it?

    Thanks!

    Regards,

    Ajeet Pal