AD7124-8 FAQ. How do I interface to multiple ADCs over the same serial interface?

Document created by JellenieR Employee on Jul 6, 2015
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Q.  How do I interface to multiple ADCs over the same serial interface?

A.  A single microcontroller can be used to communicate with several AD7124-8 devices. The /CS input of the ADC can be used to enable or disable the serial interface of the ADC. By controlling the /CS inputs to the ADCs using a decoder, the microcontroller can communicate with each ADC individually or simultaneously. The figure below shows the interface between a microprocessor and several ADCs. The /CS input of each ADC is connected to the decoder. Using the decoder, the microprocessor can select the ADC with which it wants to transfer data/instructions. When /CS is high, the serial interface of the ADC is disabled and it ignores any activity on the data bus. To communicate with the ADC, its /CS line can be taken low. The ADC will then have access to the data bus between itself and the microprocessor. The datasheet should be consulted for timing specifications. 

 

 

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                                                                      Interfacing several ADCs to a single microcontroller.

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