SNAA449 June   2025 LMX2820

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Various Options in Instant Calibration
    1. 2.1 When Delay for Instant Calibration Needs to be Increased From 2.5μs to 5μs
    2. 2.2 Generating the Lookup Table for Instant Calibration With the VCO Doubler
    3. 2.3 Reading Back the Instant Calibration Lookup Table Through SPI
    4. 2.4 Writing the Lookup Table Through SPI
    5. 2.5 Dealing With Case When Phase Detector Frequency is Changed Without Re-generating the Lookup Table
  6. 3Summary
  7. 4References

2.3 Reading Back the Instant Calibration Lookup Table Through SPI

  1. Write the following registers
    1. INDEX_WR_RD(R106[11])=0
    2. INDEX_TEST(R106[10]) =1
  2. For Index = 0 to 519
    1. INDEX_NO(R106[9:0]) =Index
    2. Readback the following
      1. INDEX_TEST_WRDATA_37_32(R107<5:0])
      2. INDEX_TEST_WRDATA_31_16(R108<15:0])
      3. INDEX_TEST_WRDATA_15_0(R109<15:0])