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LMH6521 control issue

Other Parts Discussed in Thread: LMH6521


I'm using LMH6521 on a new board.

I've some difficulties to control the amplifier in Serial mode. 

 I can correctly  write and read the device trough the SPI pins.

Aftern enabloing the ENB or ENA i see something on spectrum analyzer but chaning attenuatoion value nothing changes.

When I write, first bit is always one to apply proper attenuation immediatly.

I have double check scheamtic and footrpint but I did't find any difference from evaluation board.

Any suggestion?