AnsweredAssumed Answered

sysclk of AD9548 is unlocked

Question asked by Guan on Oct 30, 2014
Latest reply on Nov 9, 2014 by Guan

I used configuration of sequence in an old card in below:

1.Write R0x0000-R0x0417 per the setup file

2.Write R0x0A01=0x20; Set user freerun mode

3.Write R0x0005=0x01

4.Write R0x0A02=0x03(from 0x01 to 0x03)

5.Write R0x0005=0x01

6.Read R0x0D01.

when I read 0x11, then next sequence....


I completed the process, but now in a new card, I read r0x0D01, it's always 0x00(unlocked and not stable), then I measure the sysclk, it's different with the old card,


Unlocked sysclk:



Locked sysclk:





I used sch in below:




I try  many times using different ohm to lock this signal, but it doesn't work, please check the possible problem. Thanks.



Best regards.