Part Number: LMX2594
Hello,
The customer has been able to achieve phase synchronization of multiple LMX2594 chips. However, a new anomaly has occurred during use. When monitoring the output of four clocks using an oscilloscope, there is a probability that the relative phase relationship of the sine signals output by the four LMX2594 chips may change, and both integer and decimal modes may occur.
Reference frequency and phase detection frequency: 10MHz -->PLL -->100MHz, sine wave. 100MHz is provided to 4 LMX2594 chips as reference through a passive power divider.
Four LMX2594 chips with the same frequency configuration have been tested as follows:
1. Repeatedly configuring VCO automatic calibration, locking, configuring phase synchronization register, and sending SYNC signal will result in the above abnormalities;
2. Repeatedly sending sync pulses to 4 pieces of 2594 will also result in the above-mentioned abnormalities;
3. After sending the SYNC signal, repeat the core, band, and amplitude readings 300 times. Both core and band remain stable and unchanged; There is a slight change in amplitude, which is not significantly related to whether the phase is synchronized or not.
The sync signal is shown below:
The sync signal is generated using the same source 10MHz clock as LMX2594, with a pulse time of 10ms. The four LMX2594s use four 100MHz channels obtained from a power divider as a reference.
Thanks.
