MAX5417NETA+

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The MAX5417/MAX5418/MAX5419 are a family of advanced digital potentiometers that feature nonvolatile memory, address pins (AD[1:0]), and three independent resistor elements (A, B, and W) that provide a true nonlinear 64 taps from the end-to-end value. These devices are ideal for applications that require a powerful but simple adjustment of components over a broad range of values. This article aims to explain the application field and working principle for the MAX5417/MAX5418/MAX5419 family of devices.

As data acquisition devices, the MAX5417/MAX5418/MAX5419 allow easily adjustable control of wide range of physical systems such as voltage dividers, analog gain setting, and signal conditioning. In addition, they are ideal for applications involving potentiometer replacement, programmable gains, and user-controlled parameter settings. With the aid of the nonvolatile memory and address pins, the MAX5417/MAX5418/MAX5419 enable the user to store preset values, load stored values, and recall custom settings without needing to manually reset factors each time the application is used.

Continuing with the technical details, the MAX5417/MAX5418/MAX5419 each employ two 74HC595 shift-register stages, several digital control blocks and transistors, and a VDD voltage generator.. The 74HC595 serial-in/parallel-out shift registers can drive the digital logic to shift data into the devices for programming. Both a Reset pin, that controls the reset of the logic, and a Serial Data In pin, that feeds in logical “1s” and “0s”, are included for user control. The digital control blocks not only manage the 74HC595 serial data-in pins, but also control the W, A and B resistor segments.

The thin-film resistors are the heart of the MAX5417/MAX5418/MAX5419 where voltage generated on the W terminal is divided between the A and B terminals. This voltage division is accomplished according to a "binary-weighted" equation, which assigns an increment value to each of the 64 steps in the resistance settings. Each step incremental size is based on the ratio of the end-to-end resistance to the total of 64 steps. Typically, the end-to-end resistance is 250 ohm and the step size is 3.9060 ohm.

The 128 optional, nonvolatile memory locations to store various settings for the MAX5417/MAX5418/MAX5419 are programmed with a few simple commands--Load, Recall and Store. The Load command initializes the register data directly, without letting the user manually manipulate the data. On the other hand, Recall and Store allow the user to read or save settings to the internal memory. For example, with the help of these commands, the MAX5417/MAX5418/MAX5419 can keep a unique and saved setting for each individual application.

In conclusion, the MAX5417/MAX5418/MAX5419 can offer users robust, flexible, and precise control over a wide range of physical or electrical systems. Using their three in-series resistors, nonvolatile memory, and serial data in/load pins, the MAX5417/MAX5418/MAX5419 offer a reliable, precise, and intuitive integrated solution for both on and off-line adjustability of parameters.

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