CDCE62005 - Read by Registers

Hello,

the lock status can be read out from register8.

From Datasheet:

Reading from the CDCE62005
Figure 20 shows how the CDCE62005 executes a Read Command. The SPI master first issues a Read
Command to initiate a data transfer from the CDCE62005 back to the host (see Table 6). This command
specifies the address of the register of interest. By transitioning SPI_LE from a low to a high, the CDCE62005
resolves the address specified in the appropriate bits of the data field. The host drives SPI_LE low and the
CDCE62005 presents the data present in the register specified in the Read Command on SPI_MISO.

Best regards,

Julian

Hi Julian,

Thank you for the answer,

I see that it is Register 8, Bit number 6, Bit Name - PLLLOCKPIN.

But it depends on the configurations of the other registers right? Meaning , we should define to the device what is locked and what is not and according to that it will lock/not lock.

Please Advice,

Thanks.

Hello,

the PLLLOCKPIN bit (reg8 bit6) is read only and will show the same status like the PLLLOCK pin (37). Both will show, whether PLL is in lock or not.

This depends on Loop filter settings, Chargepump current, PFD frequency, VCO frequency, lockwindow. The Loop Filter Tool from the GUI, will help you to select the right loop filter combination (please configure it that you achieve a phase margin of 45 to 70deg.)

Best regards,

Julian