Hi expert,
Customer is looking for fanout solution like HMC7043LP7FE. I found one similar LMK04832.
Their system has 245.76Mhz and 240KHz, does LMK04832 support output 240Khz?
By the way, is VCXO input optional or must need?
Thanks,
Allan
I can get back to you a little sooner than Tuesday :
)
LMK04832 could support 245.75 MHz, but 240 kHz is a little too low frequency - the VCO frequency of 2457.6MHz can be divided down as a continuous or pulsed SYSREF to a maximum of 2^13, which is only 300 kHz. If 245.76 MHz is available in an external VCO or VCXO, this could be directly distributed to the outputs as a divide-by-1, and divided in the internal SYSREF divider to produce continuous or pulsed 240 kHz. Alternately, the divider range could be extended with an extra discrete D-flip-flop, by routing the SYSREF at 480 kHz through the feedback mux and out of the OSCout buffer in CMOS mode, to the D-flip-flop configured as a divide-by-2 block, then back into CLKin0 to redistribute the lower frequency SYSREF signal. This scheme could of course be extended to a pulser configuration if needed by some kind of external override on the clock or D inputs. There is likely a way to do something similar with the re-timed SYNC path in the SYSREF circuit, which might not require external dividers, provided the customer has a digital controller that can sample, or is frequency-locked to, the 245.76 MHz or 240 kHz signal.
PLL1 and VCXO are optional. In fact, if a high-performance 245.76 MHz source is available, PLL2 and internal VCO are also optional - the device could instead be used in distribution mode. Performance depends on what frequency and quality of reference the customer has available.
