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DAC38RF82: Recommended Baluns for DAC38RF82.
Part Number: DAC38RF82
I am trying to use TCM2-33WX+ as it has a low phase and amplitude imbalance.
On TSW40RF82EVM, I have made the following mods.
1. populate L7, L8, R382 and R380.
2. remove R381 and R386.
3. Connect J40 TCM2-33WX+ secondary pin 3.
4. Connect J39 to TCM2-33WX+ secondary dot pin 4.
5. Output on primary
But my signal level is reduced by about 9 dB compared to the on the board balun.
Do I need to populate R369?
What should be the voltage at the point where R386 and L7 meet?
Please let me know.
Replace R382 and R380 with 0.1uF caps since the +1.8V_ANA reference supply needs to be AC coupled.
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In reply to jim s:
You are right.
They need to be ac coupled. I did not see that.
Are there any other changes that need to be done?
Please let me know.
It is a bit hard to do these changes as there is a shield.
Thank you very much.
In reply to Channamallesh Hiremath:
I think this is it.
I could not get an external balun configuration working.
The frequency response with external balun was awful. About 8 dB variation across the whole frequency band.
Probably, I am using the wrong balun. I do not know. I have abandoned my experiment.
I have gone back to the onboard balun.
Thanks for your help.
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