0001188112-10-000532 DEFA14A 1 20100312 20100312 20100312 SILICON LABORATORIES INC 0001038074 3674 742793174 DE 1231 DEFA14A 34 000-29823 10676801 400 W CESAR CHAVEZ AUSTIN TX 78701 5124168500 400 W CESAR CHAVEZ AUSTIN TX 78701 DEFA14A 1 t67153a_defa14a.htm DEFINITIVE ADDITIONAL MATERIALS