I would like to use ADP1055 with external synchronization clock featured spread spectrum modulation.For example, LTC6908-1 (Fcenter = 200-400 kHz, ±10% Frequency Spreading).
But I not sure that ADP1055 can support spread spectrum clock on SYNC pin.
Can someone confirm or disprove that, please?
-- Best Regards
I read in ADP1055 Data Sheet
"EXTERNAL FREQUENCY SYNCHRONIZATION
The ADP1055 has a SYNC pin that is used for frequency synchronization. The internal digital phase-locked loop (DPLL) is capable of determining the master frequency on the SYNC pin (f SYNC ) and locking the internal switching frequency to the external frequency. The lock or capture range is ±10% of the switching frequency, which is programmed using the FREQUENCY_ SWITCH command (Register 0x33). "
It seems that ADP1055 can support spread spectrum on the assumption that modulation is not exceed ±10%.
Any comments or suggestions?
You are correct. As long as input frequency does not deviate from internal frequency in 0x33 the ADP1055 will track the variation and spectrum of the input frequency.
May I ask how you are going t generate this spread spectrum waveform and feed it into the SYNC pin of ADP1055?
Thank you for answering.
I think I will use LTC6908-1 with 5-> 3.3V resistor divider or MOSFET or IC voltage translator.