Issue regarding VGA ADL5330

We are using VGA IC ADL5330 at 2.2-2.6GHz range & observed that at frequency 2.44GHz , VGA control voltage =0.95V, I/P of VGA = -17.2dBm & at O/P of VGA ( after balun) = -44.3dBm .At pg. no. 4 of IC datasheet it is mentioned that in 2.2GHz - 2.7GHz range higher side gain (i.e. at Vgain=1.4V) 16dB to 10dB resply.At pg. no. 11, fig. no. 28, in 2.2- 2.7GHz range, I/P return loss is -15dB & fig. no. 30, O/P return loss is -5dB approx.On page no. 15, it is mentioned that “The useful lower limit of the gain control voltage increases at high frequencies to about 0.5 V and 0.6 V for 2.2 GHz and 2.7 GHz, respectively.” Can’t we use VGA gain control from 0 to 1.4V? or should it be from 0.5V to 1.4V?

As per data sheet of ADL5330 & observations it seems that VGA is not going to offer any gain in dB above 2.2GHz. Will you pl. suggest another VGA or any other alternative to achieve gain in dB? Your comments pl.

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