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AD7790 - current consumption -

Hello I have a Problem with the supply current of the AD7790.

I choose the device in fact of the low consumption , normally < 1mA.

We use different devices on the SPI-Bus, which are selected with the corresponding #CS-Signal.

Sometimes, after an SPI communication [I didn't choose the AD7790] , the supply current of the AD7790 increase up to 4mA until I communicate directly with the AD7790 and start  a conversion. At this time the current decrease again to the normal value ?

What happend inside the device, can you help me ?

Regards

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