I'm pretty sure, but...
Is it possible to shut down halfs of ADL5566 idependently to each other, pulling down the corresponding ENBL?
Is it nessesary to supply a power to unused VCC? And what about rest pins? Inputs, outputs and VCOM?
Actually, the adl5566 has ESD diodes across Vcc so you will need to maintain voltage on the unused channel and put the part in disable. (this will burn an extra 8 ma).
Also, it would be best to ac couple the input to gnd of the unused side, to ensure no high frequency oscillation. (maybe short the differential inputs together with a .01 uf cap to 50 ohms or ground).
As an alternative, you could use the adl5565 amp single or the adl5567.
Thank You, Darrell for complete ansver.