An analysis of NX3 high-performance analog switch

This document is a training module for high-performance analog switches. This training module covers the basic knowledge of analog switches, including different types of switches, key parameters and their importance in specific applications. The module also introduces analog switch products and naming, as well as packaging trends in lead-free packaging.

    Analog switch basics

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    figure 1

    An analog switch in one of the following configurations is usually provided:

    Single pole single throw

    Single pole multiple throw

    Multi-pole multi-throw or multiplexer.

    The number of poles indicates the number of common terminals (or movable contacts), and the number of throws indicates the number of spare terminals that can be connected to the common side. Each package can provide single, double or multiple switches (usually even) switches. These switches can be activated independently or at the same time. NXP's high-performance analog switch portfolio includes devices in every configuration. The NX3 series provides all standard configurations of SPST, SPDT..., including single, double, and quad.

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    figure 2

    The following table adds the part number of the high-performance analog switch corresponding to each function.

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    image 3

    In some applications, the analog switch is located at the interface between the low-voltage ASIC and the higher supply voltage components. In order to activate the switch correctly, a voltage converter (or level shifter) is usually used on the select pin to ensure that the activation threshold is met. NXP analog switches provide a complete device series that integrates converter functions, thereby saving parts, PCB space, and reducing overall system costs.

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    Figure 4

    The "T" in the part number distinguishes the analog switch from the integrated converter function. Some part numbers are highlighted in this slide for low-ohm NX3 series switches. The "G" part does not contain the translator function.