Manage data source access with AD security groups

Hi,

Is it possible to manage access to our SQL data source with AD security groups?
I can only select AD users in "User and Security Management.

I tried to give a security group db_datareader and db_datawriter to the SQL database.
That way members of the group can connect to the database. But they are automatically made administrators of the data source which i don't want.

It's too time consuming to create all our users one by one as we have alot.

Thanks.