It is my understanding that you cannot make that connection with the 7" model. I believe there is an adapter that only works with the 10.1" model. However, it is not the one referenced in the other response. If you check that link, you will see it is designed for the Samsung Galaxy S3 phone.
L. M. Martindale answered on May 20, 2013
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Something like this. Samsung Adapter HDMI EPL-3FHU for Samsung Galaxy Series HDMI to MHL TV. http://www.amazon.com/Samsung-Adapter-EPL-3FHU-Galaxy-Series/dp/B008OJ4GTK
M. C. Hall answered on May 20, 2013