AD9219 power down mode

Hi all,

I am to use the AD9219 quad ADC in a new design.

I will use only three of the four ADCs and I would like to turn the fourth in power down mode.

The datasheet rev. E is not clear to me, it seems programming the 0x22 register could do the job, but there is only one register and it is not dedicated to any channel...

Could  anyone help me ?

Thanx,

Mathieu