The Si570 data sheet says: "Available LVPECL, CMOS, LVDS, and CML outputs".
toggle quoted messageShow quoted text
So the correct output coupling depends on which one you use.
LVPECL (fastest) requires 50 ohms termination to Vdd-2.0V.
LVDS and CML require 100 ohm differential (not supply-referenced).
CMOS swings within about 0.4V of the rails.
On 22 Apr 2019, at 12:39 pm, Clifford Heath via Groups.Io <email@example.com> wrote:
Check that you get the right impedance ratio - remember that it is the
square of the turns ratio.
I haven't checked the data sheet to see if the Si570 output is DC (ground)
referenced. If not, I would decouple the CT to ground with a capacitor
anyway. But check the data sheet.
On Mon, 22 Apr 2019, 02:29 Alfredo Mendiola Loyola via Groups.Io
If I connect a Center Tap of an 1:4 Transformer (Secondary) to the LVDS
outputs I will get a 50 Ohm output impedance on the Primary?
I understand that the output impedance of each output of the si570 is 100
Ohm (LVDS), When I connect each output of the si570 to the transformer
Secondary I will get 200 ohm and 50 ohm on the Primary (200 4 = 50 ohm).
Do I have to connect the center tap of the secondary to ground?