  Measurements of the branching ratios of top quark decays into leptons and
jets using events with $t \overline{t}$ (top antitop) pairs are reported.
Events were recorded with the ATLAS detector at the LHC in pp collisions at a
center-of-mass energy of 7 TeV. The collected data sample corresponds to an
integrated luminosity of 4.6 ${\mathrm{fb}}^{-1}$. The measured top quark
branching ratios agree with the Standard Model predictions within the
measurement uncertainties of a few percent.
