Typical Measurement
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SNAU217A–August 2017–Revised November 2017
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LMX2572EVM Evaluation Instructions
Table 3. Calibration-free Automatic Ramp Example
PARAMETER EXAMPLE VALUE
Ramping start frequency 4795 MHz
Ramping stop frequency 4805 MHz
Phase detector frequency 50 MHz
Ramp up / down time 200 µs
RAMP_LIMIT_HIGH 4995 MHz
RAMP_LIMIT_LOW 4595 MHz
This is a triangular ramp example. Ramp up is defined by RAMP0 while ramp down is defined by RAMP1.
RAMP_THRESH, RAMP_DLY_CNT, and RAMP_SCALE_COUNT are "don't care" because we are not
going to trigger any VCO calibration. RAMP_MANUAL = 0 means Automatic Ramping mode.
Set RAMP_EN = 1 to start ramping. Set RAMP_EN = 0 to turn off ramping.
Figure 9. Calibration-Free Automatic Ramp Setting
Figure 10. Calibration-Free Automatic Ramp
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