SNAU310 June   2024 LMKDB1102 , LMKDB1202

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2EVM Quick Start
    1. 2.1 Setup
    2. 2.2 EVM Measurements
  8. 3Hardware
    1. 3.1 EVM Configuration
      1. 3.1.1 Power Supply
      2. 3.1.2 Logic Input and Outputs
      3. 3.1.3 Clock Input
      4. 3.1.4 Clock Outputs
      5. 3.1.5 Status Outputs, LEDs, and Test Points
  9. 4Implementation Results
    1. 4.1 Typical Phase Noise Characteristic
  10. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 LMKDB1102EVM Bill of Materials (BOM)
    4. 5.4 LMKDB1202EVM Bill of Materials (BOM)
  11. 6Compliance Information
    1. 6.1 Compliance and Certifications
  12. 7Additional Information
    1. 7.1 Trademarks
  13. 8References

4.1 Typical Phase Noise Characteristic

Figure 5-1 shows a typical phase noise performance for 156.25MHz reference clock input from the SMA100B. Both the LMKDB1202 and the LMKDB1102 have the same performance.

LMKDB1x02EVM was configured in cascade mode to get these measurements, which were obtained by following these steps:

  1. SMA100B → LMKDB1x02EVM input. Then, LMKDB1x02EVM to secondary LMKDB1x02 EVM. This was done to get a fast slew rate at the input. Other methods like clipping a circuit can be used to get a desired slew rate and square wave form as well outputted from the SMA100B.
  2. Output phase noise is measured through a Balun to the differential waveform from the LMKDB1x02 into a single-ended waveform for the phase noise analyzer.


LMKDB1102EVM, LMKDB1202EVM LMKDB1x02 Output Clock Phase Noise
Figure 4-1 LMKDB1x02 Output Clock Phase Noise