Part Number: LMK00334-Q1
In my design ,LMK00334-Q1 differential HCSL clock inputs are from one clock generator , I want to use AC-coupled between generator and LMK00034-Q1. In LMK00034-Q1 datasheet, I found that "The CLKin input has an internal bias voltage of about 1.4 V"(on Page16), but I didn't find that whether there was also internal bias volatage on CLKin * pin?
If CLKINX*pin(CLKIN0* and CLKIN1*) has no internal bias volatge, I think I need to use DC-coupled. In LMK00334-Q1 datasheet, VCMD(differential input common mode volatge) mimum value is 0.25V ,but the generator output common mode voltage minmum value is also 0.25V ,there is no margin, in this case, whether DC-coupled is OK?
Yes, DC-coupling is OK. I recommend to DC-couple the input.
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In reply to Lane Boyd:
1. whether there are internal bias volatage on both CLKIn pin and CLKin * pin?
2.If the input pins:OSCIN,CLKin1,CLKin1* are not used, can these pins be left floating?
In reply to user3746678:
A1. I just measured it on LMK00338EVM. CLKinX bias = 1.08V, CLKinX* bias = 1.35V . For this measurement, there is no input/output using the default EVM assembly.
A2. Yes, these unused pins can be left floating
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