British chipmaker CSR (CSR.L) said on Monday it had agreed to buy U.S group Zoran Corporation (ZRAN.O) to add imaging and video to its wi-fi, bluetooth and location technology offer. Under the terms of the agreement, Zoran shareholders will receive 1.85 shares in CSR in the form of American Depository shares for each Zoran share, valuing Zoran at about $679 million. The deal implies a 39.9 percent premium to Zoran's closing share price on Friday, CSR said in a statement. CSR also said it would return up to $240 million to shareholders in a share buyback. (Reporting by Paul Sandle, Editing by Mark Potter)
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