Part Number: LMK04828-EP
Other Parts Discussed in Thread: LMK04828
Hi ,sir
I am working on a custom hardware utilizing the LMK04828. My goal is to achieve Multi-clock Sync across multiple boards.
The hardware clocking architecture is centered around the LMK04828 jitter cleaner/clock distributor. The current configuration is as follows:
-
the first clock board: A 100MHz clock is provided to the
OSCinpin of the LMK04828 to achive the 250MHz clock and 7.8125MHz sysref to the second clock board. - the second clock board: the 250MHz clock is provided to the CLKin1 pin of the LMK04828，while 7.8125MHz sysref is provided to the CLKin0 pin of the LMK04828, this LMK04828 is used as clock distributor to produce more DCLKOUTs (250MHz) and SDCLKOUTs (7.8125MHz)。
- question：we only provided 250MHz clock to the CLKin1 pin of the second clock board LMK04828 ,the DCLKOUTs are 250MHz, while SDCLKOUTs are spurs.
But when we provided 250MHz clock to the CLKin1 and 7.8125MHz sysref to the CLKin0 pin of the LMK04828， the SDCLKOUTs work well。- We don't know why SDCLKOUTs are spurs when we only provided 250MHz clock to the CLKin1 pin。Can you give me some advice?
