4.2.3 External VCO Mode
In addition to the internal VCO, LMX2820 also support working with an external VCO. The polarity of the phase
detector has to be set properly to match with the actual Vtune characteristic. The LMX2820EVM offers various
options to implement passive or active loop filter onboard.
Figure 4-5. External VCO Mode Setting
4.2.4 Register Readback
To read back the written register values, follow these steps:
1. Click the Register Name that you want to read back.
2. Click
Read Register
to read back the register value.
Figure 4-6. Register Readback
Typical Measurement
SNAU246A – JUNE 2020 – REVISED JANUARY 2021
LMX2820EVM Evaluation Module
9
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