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Same I2C bus but with more than four ADG728

Hi 

We are trying to expand our test setup from 8 channels to 12 channels, currently, we have four ADG728 to connect all 8 channels together for one of the tests. We are at four ADG728 and what would be the best way to expand our application to have 12 channels? We would also need the 12 channels to be connected together for one of the tests. Any other part that may have more channels or more bits for the I2C address? 

Do you have any newer switch matrix similar to ADG728 or next gen of ADG728 that has more channels or more bits for I2C address?

Thank you, 
Jason