Other Parts Discussed in Thread: LMX2594, , LMK04828, LMK04832
In my design, I use LTC6955 to DAC38RF89,And Provide CLock to LTC6955 by LMX2594,LTC6955 is CML output clock buffer,But DAC38rf89 is need LVPECL Clock,though AC Couple, I connect their, is ok?
In this states, I use 81180 JESD mode, Anything sees ok,but short pattern Test is not ok,And Nothing happened in dac's output;I through register config, config NCO, spi constant output,is need pull down txen before? I didnot pulldown this pins,and also no output;I use K21.5 test, ILA test, and Ignore ILA transfer,all same answer;reg 0x64-0x6B,keep all zero's。In LMK04828, is ok;also in LMK04832,when LMK04832 is config LVPECL , is ok, config cml, the same as used LTC6955.