By Matt Grossman 



  Analog Devices Inc. has agreed to acquire Maxim Integrated Products Inc. in an all-stock transaction, the companies said Monday. The deal values the combined companies at more than $68 billion, according to the companies. 


  The Wall Street Journal had reported Sunday evening that the companies were in merger talks. 


  Maxim stockholders will receive 0.63 shares of Analog common stock for each share of Maxim stock they own when the deal closes, which is expected next summer, the companies said. Current Analog stockholders will own 69% of the combined companies, while Maxim owners will control the other 31%. 


  Both companies make analog semiconductors. 


  Maxim shares traded 17% higher since Friday's close in premarket activity Monday morning. Analog shares rose 0.9%. 


  Write to Matt Grossman at matt.grossman@wsj.com