What should I do if the analog IC is not used?

Unused pins on analog ICs can significantly increase the risk of premature device failure through electrostatic discharge (ESD). Although unused outputs can be left unconnected, and generally so, whether this pin is analog or digital, it is usually best to connect to a power supply. In a single-supply system, it is usually connected to a negative supply, ie "ground", and in a dual-supply system, it is an intermediate supply rail, but there are some important exceptions. Be sure to read the easy-to-understand data sheet 2 and follow the recommendations. However, if this is not covered, grounding is usually an excellent practice.

An unused amplifier input is an important exception. Grounding the unused input of the amplifier may increase power consumption. Therefore, the best practice in this case, and often the only safe way, is to connect the amplifier to a buffer that connects the input to a potential between the two rails.

CMOS switches and multiplexers are symmetrical devices whose signal inputs and outputs are interchangeable, so all unused pins should be treated as inputs rather than outputs. Therefore, these pins should be grounded.

An internal pull-up or pull-down resistor pulls the input up to positive supply or pulls down to ground. If the unused input has such a resistance, no connection is required. However, if you connect this pin, you should connect it to the same power supply as its resistor, because any other connection will cause current to flow into the resistor, which can cause power consumption (this power consumption can be quite small, but avoid any waste whenever possible) ).

Pay particular attention to unused logic inputs because some logic inputs must be connected to logic 1 when not in use. In addition, some logic inputs have three states instead of two, and open conditions are also defined as a logic state that may need to remain unconnected.

In summary, connections that do not use IC pins must be considered as an important part of the analog circuit design process and should not be underestimated.

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