Other Parts Discussed in Thread: LMK04828, DAC38J84, ADS54J66
Hi kang,
Than you for your previous help. I've improved the low frequency response of the outputs and I want to check the signal quality over a period of time. Could you please let me know how to connect an external 10MHz reference to the EVM (ie I want to sync with my scope to measure the outputs). I've tried the step lists at page 15 of the EVM manual
"Clock Generator using External Reference The LMK04828 is used a clock generator using an external reference provided to the CLKIN SMA connector (J17). For this option, R177, C206, and C121 should be uninstalled and R185, R186, and C92 should be installed. JP2 can be left open to turn off the onboard VCXO to avoid crosstalk. This option allows a wider frequency range of generated clock frequencies only limited by the VCO frequency ranges of the LMK04828 (see LMK04828 datasheet (SNAS605) for VCO frequency ranges). The possible clock outputs are an integer division of the VCO frequency with a maximum division of 32. PLL1 of the LMK04828 is bypassed in this mode"
but it didn't work. Did I miss anything? The GUI shows errors and all PLLs are out of lock.
Best wishes,
Kelly