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Typical Measurement
11
SNAU217A–August 2017–Revised November 2017
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LMX2572EVM Evaluation Instructions
3.2.5 FSK Modulation
Direct digital FSK modulation is supported in LMX2572. FSK SPI mode supports discrete 2-, 4-, or 8-level
FSK modulation while FSK SPI FAST mode supports arbitrary level FSK modulation. The followings is an
FSK SPI FAST mode example.
Table 5. FSK SPI FAST Mode Example
PARAMETER EXAMPLE VALUE
Phase detector frequency 100 MHz
CHDIV 8
PLL_DEN 8000000
FSK_DEV_SCALE 1
Frequency deviation ±648 Hz; ±1944 Hz
Keep writing to the FSK_SPI_FAST_DEV register field the correct values, the output of LMX2572 is a
discrete 4-level FSK modulation signal.
Figure 15. FSK SPI FAST Mode Setting
Figure 16. FSK SPI FAST Mode
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