Hello,

I am having trouble understanding how to properly interface the NB6L295MMNG delay‑line IC.

I want to drive the NB6L295MMNG input directly from my Si5351A‑B‑GT programmable CMOS clock generator, but I find the single‑ended input interface in the NB6L295MMNG datasheet confusing. The datasheet only shows two diagrams, and neither includes an explanation of how to configure the single‑ended interface. In particular, the way Vref/Vth is connected differs between the two figures (I understand that one is for AC‑coupling), but it is still unclear how I should correctly connect the input and Vth for my use case.



I would also appreciate it if someone could tell me a good method for generating Vth (reference voltage, resistor divider, etc.).

Thank you for you're help!
Domen

 

you need to use a differential driver. Figure 11 shows you how:
signal from your generator connects to non-inverting input of the driver (top).
the inverting input of your driver is connected to fixed voltage that is some mid point between peaks that your generator produces.
if your generator output is a square wave 0-3V, then mid point of about 1.5V (not critical) is suitable. that is threshold voltage (Vth) as shown in timing diagram.

 

you need to use a differential driver. Figure 11 shows you how:
signal from your generator connects to non-inverting input of the driver (top).
the inverting input of your driver is connected to fixed voltage that is some mid point between peaks that your generator produces.
if your generator output is a square wave 0-3V, then mid point of about 1.5V (not critical) is suitable. that is threshold voltage (Vth) as shown in timing diagram.

The clock generator recommends the use of a 50ohm transmission line. So do i connect the clock to my NB6L295MMNG as shown in figure 11. and ground the internal termination resistor so i don't get reflections?


This is my improved setup