Typical Measurement
7
SNAU235 – May 2018
Copyright © 2018, Texas Instruments Incorporated
LMX2572LPEVM Evaluation Instructions
Figure 6. Default Output
3.2
Additional Tests
3.2.1
Phase Adjustment
Use
to adjust the phase of the RF output signal.
Phase shift in degree = 360° × (MASH_SEED / PLL_DEN) × (P / CHDIV)
where
•
P = 2 when VCO_PHASE_SYNC_EN = 1, otherwise P = 1
(1)
and
show an example.
Table 2. Phase Adjustment Setting
PARAMETER
EXAMPLE VALUE
MASH_SEED
800
PLL_DEN
1000
CHDIV
32
VCO_PHASE_SYNC_EN
0
Phase shift = 360° × (800 / 1000) × (1 / 32) = 9°
(2)
The user can write 800 to MASH_SEED 40 times to get the 360° phase shift.
Figure 7. Phase Adjustment Setting
