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SNAU136 Datasheet(PDF) 22 Page - Texas Instruments

Part No. SNAU136
Description  The Texas Instruments LMX2581EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMX2581 Wideband Frequency Synthesizer.
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SNAU136 Datasheet(HTML) 22 Page - Texas Instruments

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22
LMX2581EVM User’s Guide
November 2012
Output Power
-6
-4
-2
0
2
4
6
8
10
12
14
0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
OUTx_PWR
A
B
The above data was taken by taking the single-ended output power for RFoutA+ and RFoutB+
varying the OUTx_PWR programming field. RFoutA- and RFoutB- were terminated with a 50 ohm load.
Notice that OUTA and OUTB have different performance. THIS IS NOT BECAUSE THE OUTPUTS
ARE DIFFERENT IN THE CHIP. The reason for this difference is that RFoutA outputs have a resistive
(50 ohm) pull-up and the RFoutB output has an inductive pull-up.
The inductor pull-up offers higher output power and the current consumption is lower, so it is an
excellent choice, but the matching is not very good because the output impedance is equal to the pull-up
component and board traces. For the inductive pull-up, consider using a large inductor so that it looks
like high impedance at the frequency of operation


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