Hello-
We're using an LMX2531LQ1742 to synthesize 904MHz. The reference input frequency (OSCin) is 49.156MHz. According to the LM2531 datasheet (see paragraph 2.7.8), XTLSEL should be set to 1. But when writing 1 to XTLSEL, the Lock Detect output (Ftest/LD) is low and intermittently high, even though the VCO is locked. When writing a 2 or 3 to XTLSEL, the Ftest/LD pin is a solid and steady high, and the VCO stays locked.
What is the recommended setting? Why does the status bit toggle when set per the data sheet? Thanks and Best Regards,
-Tim Starr on behalf of HD@CS