adrv9002 LO change is very slow

Question

I am using the adrv9002 eval board. All seems to be working correctly. 
 However, changing the LO seems to take about 200mS which is quite slow. 
 I am changing this through 
 out_altvoltage0_RX1_LO_frequency via sysfs. How can I speed this up? I would like to scan from 30M to 6G as fast as possible. With the slow LO change this takes 30 seconds, which is very slow. Maybe SPI clock running slow? If so, how would I change this? Thanks for the help

nsa · Accepted Answer

swie said: However, setting in_voltage0_ensm_mode back to rf_enabled takes a long time. 
 In this case, I believe the PLL will only retune when you move the port to rf_enabled which will add more time to an operation that already takes some time... 
 swie said: Is there a parameter maybe in /sys/kernel/debug/iio that I can set to speed this up? 
 No, if we had that we would already have pointed you to that paramater instead of saying that fast hopping is the way to go . 
 swie said: Is there possibly a way to change the RX1_LO loop filter parameters via /sys/kernel/debug ? 
 Currently no... 
 swie said: or enable/disable calibration after changing the RX1_LO? Via sys/kernel/debug? 
 Not sure I'm following this question... What do you mean by enable/disable calibration? Don't think that there's anything you can do to speed up LOs other than fast hopping 
 - Nuno S&aacute;)

Electronic Design Services - PartnerZone

Products Mentioned

adrv9002 LO change is very slow