Texas Instruments LMX2492EVM, User Manual

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Typical Measurement
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6 SNAU160E – March 2014 – Revised October 2017
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LMX2492EVM Evaluation Module
3 Typical Measurement
3.1 Default Configuration
3.1.1 Loop Filter
The parameters for the loop filter are:
Table 1. Loop Filter Configuration
PARAMETER VALUE
VCO frequency 9.4 - 10.8 GHz
VCO gain 240 MHz/V
Effective charge pump gain 3.1 mA
Phase detector frequency 100 MHz
Loop bandwidth 435 kHz
Phase margin 60.8 degrees
C1_LF 68 pF
C2_LF 3.9 nF
C3_LF 150 pF
C4_LF Open
R2_LF 390 Ω
R3_LF 150 Ω
R4_LF 0
Ω
Figure 5. Loop Filter
3.1.2 Typical Output
1. Follow Section 2 to setup the evaluation.
2. Go to "USB communications" → "Write All Registers" to write all the registers to LMX2492.
Default output is 4.8 GHz at RFout/2 SMA connector.