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Multiple AD5933 using one ADG728


I want to communicate "16" AD5933 to a single microcntroller.

I need to know how to connect SDA and SCL for switching and another pair of SDA and SCL for the transfer of data to ADG728.

Does it mean the microcontroller should have two I2C communication.

Please let me know how to connect 16 AD5933.

And will the speed be of communication decreased??

Let me know the alternate way using ADG732 using chip select.