LMX2592: Problem About LMX2592 Output Power with Corresponding Register Setting

Hi there:

Now we have a problem about LMX2592 using:

LMX2592 is used to generate two 3GHz sampling clocks connected to two ADC12DJ3200s, which are designed as below:

Where, the LMX2592 outputs are named as ADC_LMX2592_REFOUTAP/M and ADC_LMX2592_REFOUTBP/M. Behind the AC-coupling capacitors the two differential-ended clocks are connected to ADC12DJ3200s.

The measured Vpp of LMX2592 output is about 660mV using KEYSIGHT DSO90404A and the attached differential strobe, with the LMX2592 OUTA_POW register(REG46[13:8]) set to 0(decimal). The output the result is as below:

The 660mVpp (approximately -3.46dBm on 100ohm characteristic impedance differential lines) result is far smaller than the nominal rating in the datasheet: 8dBm@3GHz output frequency (Page7: Chapter 6.5 Electrical Characteristics). So, we set the register to a larger value, which was meant to make the output power larger, but the output power didnot increase as the datasheet says "increase power from 0 to 31" in the page 27:"Table41.R46 Register Field Descriptions".

For example: when set to 8(decimal): about 70mVpp

When set to 31(decimal): about 40mVpp

Even when set to 63(decimal): about 30mVpp

Result from the screenshots above, we can see the output power didnot increase with the register value got larger; Inversely the output power seemed to be decreasing with the register increasing.

So, I wanna know where maybe the problem exists, or what is the correct method  to increase the output power of LMX2592.

Looking forward to your answer, thanks a lot~~~!

P.S. the register settings are as below: (register values are generated with the official tool "TICSPro")

        0x002216, ////RESET
        0x002214,

        0x4000AF,
        0x3F00A8,
        0x3E0000,
        0x3D0001,
        0x3B0000,
        0x3003FC,
        0x2F00C0, ///0x2F00C0,///0x2F00CF, power enhance
        0x2E00A3,//0x2E0023,///0x2E0F23,  power enhance

        0x26003C,
        0x2D0000,
        0x2C0000,
        0x2B0000,
        0x2A0000,
        0x2903E8,///0x290001,///Denominator LSB of N-divider fraction
        0x280000,
        0x278204,////17

        0x254000,
        0x240418,////0x240C18,
        0x23101B,
        0x22C3EA,
        0x214210,
        0x204210,
        0x1F0601,
        0x1E0034,
        0x1D0084,
        0x1C2924,
        0x190000,
        0x180509,
        0x178842,
        0x162300,
        0x14012C,
        0x130965,
        0x0E018C,
        0x0D4000,
        0x0C7001,
        0x0B0018,
        0x0A10D8,
        0x090302,
        0x081084,
        0x0728B2,
        0x041943,
        0x020500,
        0x010808,
        0x00221C