this, and what caveman said.
if I deadlifted more than once a week, either my rows or my squats would be affected with my current split.
for me, deadlifting more than once a week would require shuffling things around a bit, and probably eating more depending on the type of work done.
if your other lifts are still going up and you're progressing towards your physique goal (if you have one), then you're fine for now.
your body and the weight on the bar for your deadlift and other lifts will tell you when to back off.