SQL CAST or CONVERT

I'm trying to convert an INT to VARCHAR in my CASE statement by using the following:

SELECT CASE
		WHEN CAST(AuthenticationMode AS VARCHAR(7)) = '0' THEN 'Mixed'
		WHEN CAST([AuthenticationMode] AS VARCHAR(7)) = '1' THEN 'Windows'
	   ELSE [AuthenticationMode]
	   END AS 'AuthenticationMode'

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But I get the following error:
Conversion failed when converting the varchar value 'Mixed' to data type int.

Any ideas?

Best regards

Rasmus