ADF4360-7 's datasheet says Fig31 circuit is designed for 900MHz 5.0dBm.
I worry about RFoutA/B terminal, those voltage may exceed the absolute max specs when it's 5.0dBm output.
Could I have a comments ?
Assuming VDD = 3.3 V. The Absolute Max Rating (AMR) says the analog I/O voltage must be between -0.3 V and +3.6 V.
+5 dBm in a 50 Ω system is 1.125 Vpeak-to-peak. This is well within the AMR.
Thank you very much for your prompt support.
Actually, RFoutA/B terminals will swing centering on 3.3V.
When the transistors connecting REFout A/B have been a little un-matched, then the swinging level will increase, I think.
But DC level should be 3.3V.
How should we think about AMR of RFoutA/B terminals?
How is the DC level of RFout centered at 3.3 V? Are you doing something external to the ADF4360-7?
Thank you very much for your reply.
RFoutA/B bound to Vvco with inductor.
Could not RFoutA/B terminal exceed AMR?
The signals that are fed back to the RF input are internal. The internal signals aren't pulled up to Vvco. The situation you're describing above isn't a problem; it's normal usage.
I see what you mean.
But, please look at just the terminal voltage.
Many RF devices don't define AMR for such terminals, or defines only DC level, I think.
For example, ADL5602 doesn't have described AMR of RFOUT terminal.
"Analog I/O" of ASD4360-7’s AMR, doesn't say about "REFOUTA/B", might be...
RFOUTA/B are collector-terminals, so AMR is 3.9V, I think.
Could I have a comment?
Maybe the specification should mention the load. When you use a 50 Ω, the voltage swing will always be below VDD.
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