Document and Entity Information	9 Months Ended
	Sep. 29, 2012	Oct. 17, 2012
Document and Entity Information
Entity Registrant Name	SILICON LABORATORIES INC
Entity Central Index Key	0001038074
Document Type	10-Q
Document Period End Date	Sep. 29, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-29
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		41,599,066
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3