I need help regarding HMC675LC3C. I have a confusion.
I need to give clock at 8.9 GHz at LE pin.In latch enable characteristics, Latch Enable Input Range is from 1.6V to 2.4V. What does this mean? Is this Voh value ? i.e if voltage is between 1.6 to 2.4V, chip will be in track mode, if less than 1.6V, chip is in latch mode?
Or does it mean that 1.6 to 2.4V is the peak to peak value of LE signal?
Also, if I am using Vee = -3V, Vcco = 0, Vcci = 3.3V, AC coupled LE input terminated at 50 ohms with ground, I need to specify what will be requirements for clock (LE) signal. Can you please tell me its peak to peak value and common mode voltage? do i need to give
some constant at LE bar? If yes then how much?
Latch Enable Input is differential. As in the operational description section of the datasheet, if (LE-LE_bar) is HI, HMC675 will be in Latch Mode. HI means 1.6~2.4V and it is LE-LE_bar. Lets take the mid value of this range which is 2Vpp. You should apply 1Vpp each port, and they should be differential. You dont need to give any constant to them.
What if i need to give to give single ended input? In that case do I need to give some constant voltage at LE_bar?
LE_bar should be connected to the ground with a 50ohms resistor