R
René
- Jan 1, 1970
- 0
Sorry to bother you all with a basic quastion:
I like to use a balun like the Murata LDB212G4005C-001 for a Zigbee
project.
The balun is described as a 50 / 50 Ohm device.
On the balanced side it has 2 balanced connections and a centre tap.
Question: what is actually 50 Ohm on the balanced side?
1. Centre tap to each of the balanced connections (so total
impedance (if terminated correctly at unbalanced side) is ~*200*
Ohms?)
2. Balanced connection to other balanced connection?
As the Zigbee device has a balanced output with complex impedance
~approx. 200 Ohms, it seems a 200 to 50 Ohm balun would be in order
(give or take a few extra L's / C's to match and filter), yet the
manufacturer provides an example around a 50/50 ohm balun.
The datasheet is utterly unhelpful, as is the datasheet of the
HHM1517, which is a similar part.
Insights welcome! TIA
I like to use a balun like the Murata LDB212G4005C-001 for a Zigbee
project.
The balun is described as a 50 / 50 Ohm device.
On the balanced side it has 2 balanced connections and a centre tap.
Question: what is actually 50 Ohm on the balanced side?
1. Centre tap to each of the balanced connections (so total
impedance (if terminated correctly at unbalanced side) is ~*200*
Ohms?)
2. Balanced connection to other balanced connection?
As the Zigbee device has a balanced output with complex impedance
~approx. 200 Ohms, it seems a 200 to 50 Ohm balun would be in order
(give or take a few extra L's / C's to match and filter), yet the
manufacturer provides an example around a 50/50 ohm balun.
The datasheet is utterly unhelpful, as is the datasheet of the
HHM1517, which is a similar part.
Insights welcome! TIA