Here is how I did it…
host: I used the AD domain name (e.g. domain.com), which should resolve to any domain controller. You can also enter a specific domain controller (dc1.domain.com).
nameField: I used displayName, but you can also use the container name field (CN).
baseDN: The distinguished name of the container that user searches will be performed on. For example, to include all users in your AD, use DC=domain,DC=com. To include only the users in the “Users” container, use CN=Users,DC=yourdomain,DC=com.
adminDN: The distinguished name of the user with permissions to perform directory operations (e.g. CN=Administrator,CN=Users,DC=domain,DC=com). I would recommend creating an account just for this situation and assigning the minimum amount of permissions needed (which I haven’'t determined yet).
authorizedUsernames: the container name of the adminDN user (e.g. Administrator).