MAX972EPA

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Linear-comparator circuits are useful for comparing electrical signals of different magnitudes. The MAX972EPA is a device capable of performing such a comparison. It is a dual comparator with an onboard op amp that is ideal for constructing Analog-to-Digital (AD) or Digital-to-Analog (DA) converters, as well as other precision applications.

Generally speaking, a linear comparator compares two analog signals, or two digital signals, and outputs a logic-level mark/space ratio proportional to the difference between the two inputs. This is accomplished by amplifying the difference between the two input signals, then comparing the amplified difference with a reference voltage. In the MAX972EPA part, the inputs are connected to a pair of op amps, each of which provides a common mode rejection ratio (CMRR) of 79dB, reducing the effects of common-mode noise from both inputs. The outputs of the two op amps are then compared to a fixed reference voltage, and the comparator outputs a logic-level “high” if one input is higher than the other, and a “low” if the other input is higher. The on-chip voltage reference is factory-trimmed to ensure accuracy.

The MAX972EPA provides two independent, low-power comparators in a single 8-pin package. The output stage features rail-to-rail logic-level outputs that support the low power consumption required by battery-powered and portable applications. It also features a 2.1V operation voltage, which further improves the power efficiency. This device uses a single 2.7V-5.5V power supply, with a neutral ground and rail bias. The input common-mode range extends down to ground, avoiding the need for level shifters.

The MAX972EPA is especially suitable for low-power, precision applications. It is designed to be used in converting between digital and analog signals in communication systems, medical devices, industrial electronics, and other applications where low power consumption is critical. It is also used for motor control applications, especially when the system requires accurate comparisons between two signals without the use of external components. The MAX972EPA is rated for temperatures ranging from -40°C to +125°C, making it a suitable choice for use in demanding conditions.

In summary, the MAX972EPA is a low-power, precision comparator that is suitable for many different types of applications. It is capable of comparing two analog or digital signals and outputting a logic-level mark/space ratio proportional to the difference between the two signals. The device operates on a single 2.7V-5.5V power supply, with an onboard op amp providing an excellent common-mode rejection ratio. Its rail-to-rail output stage allows for higher power efficiency, and its factory-trimmed reference voltage ensures accuracy. All of these features make the MAX972EPA an ideal choice for a variety of precision applications.

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