MAX9109EXT+T

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The MAX9109EXT+T is a linear-comparator, which is a device used to compare the magnitude of two voltage signals applied at its inputs. This device is equipped with an open-drain configuration, enabling pull-up resistors to be used for level shifting applications for a load of up to 10A. The MAX9109EXT+T is ideal for applications in a variety of systems, including motor-control and other industrial-control systems, power systems, and consumer-electronics, owing to its versatility and high performance.

An important factor when considering the performance of linear-comparators is their power-supply-noise tolerance. The MAX9109EXT+T supports a wide supply range of 1.8V to 5.5V and features an internal 1.2V voltage reference. This range allows for up to 800mV of noise and ripple on the power-supply to be tolerated, resulting in a reduction of output glitch-noise and reduced jitter due to power-supply-noise. This makes the part suitable for use in noise-sensitive systems.

The device’s open-drain configuration allows for the utilization of level shifting circuits, increasing versatility. The MAX9109EXT+T incorporates a 3.2V to 28V integrated pull-up voltage regulator, enabling a single resistance to be used for all levels shifted, leading to reduced board-area and complexity, and increasing system reliability.

The MAX9109EXT+T features a 1.2V internal reference, which is necessary when comparing two reference voltages from two identical sources. This allows for better accuracy within the device when comparing two very close analog values. The reference provides a full-range input of 1.4V – 27V for a minimum load of 10mA. With the addition of an external resistor, the reference voltage can be changed from its nominal 1.2V to a higher voltage, allowing a greater number of different input voltages to be compared.

The MAX9109EXT+T also features a Shutdown (SHDN) mode, which disables the outputs while keeping the powered-on, reducing power consumption. This mode is intended to be used in combination with level-shift circuitry, allowing the user to enable and disable the devices with minimal board-area. An integrated power-on reset circuit is included, preventing outputting of incorrect logic levels until the device has stabilized. A wide input common-mode range further increases the power-saving measure whilst allowing the device to remain operational in a wide range of input situations.

An on-chip voltage comparator is also included, allowing for straightforward level-detection. The comparator has two reference inputs, one for the positive voltage (VREF) and the other for the pull-up voltage (VPU). The comparator also features an internal latch mode, allowing it to be used when relatively slow (~1ms) changes in the input need to be measured.

In conclusion, the MAX9109EXT+T is a high performing, versatile linear-comparator well suited for a variety of systems, due to its extensive feature set and wide supply-range. Its open-drain configuration, high power-supply-noise tolerance, and on-chip reference and comparator, make this device ideal for noisy or level-shifted applications.

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