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The problem of LMX2531 output power

Other Parts Discussed in Thread: LMX2531

I am facing a problem that when debug the PLL chip LMX2531,the output signal power is only -10 dBm.but according to the datasheet of LMX 2531,the normal output power is 0 to 5 dBm (enable the VCO output divider). the output frequency is ok and the chip can lock. who can tell me what i should do? thanks a lot.