ADC3683: invalid Q-data in complex decimation

Part Number: ADC3683

Hello.

Real mode is fine of ADC3683, but in complex mode Q data are not correct, they are constant. Either 0 or 1. I use 1-wire mode in both cases, data lanes DA1 and DB1 are not connected anywhere, so they are turned off. However, if I turn them on, Q-data flow correctly. Why, for example, in chapter "8.3.5.4.1 Configuration Example" are not also unused lines turned off? Is there any reason, why DA1 and DB1 shall be turned ON?