LM293ADR

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The LM293ADR is a low cost, general purpose, single supply differential amplifier with two independent adjustable current-limit comparators ideally suited for applications requiring precise measurement of variable limits. The two adjustable current-limit comparators can be enabled and disabled independently through various control signals and are used to detect variable limits or boundaries in a wide variety of real-world applications

Introduction of the LM293ADR

The LM293ADR is a single supply, differential amplifier with two independent adjustable current-limit comparators. It is designed to accurately sense precise variable limits or boundaries in a wide variety of applications. The comparators feature internal current-limiting circuitry which monitor a specified voltage level and is adjustable as user defined limits. The adjustable current-limit comparators can be enabled/disabled independently through a variety of control signals, allowing for precise comparisons based on the user’s requirements. This is especially useful in industrial or medical systems where precision can be the difference between success and failure.

The LM293ADR is offered in a small 8-pin package and is capable of operating over a wide temperature range of -55°C to 150°C. There is also a wide range of power supply voltages available ranging from 2.7V to 18V. The high input common mode voltage range of -0.2V to (V+ - 0.7V) allows the LM293ADR to operate in applications across multiple power supply ranges. Likewise, the inputs are also capable of being driven with a large bias voltage of ±6V.

Application field of the LM293ADR

The LM293ADR is an ideal choice for applications requiring precise measurement of variable limits or comparisons. In industrial systems the device can be used to detect specific high and low temperature set points and react accordingly. In medical systems the device can be used to detect and react to pulse rate and oxygen levels. Additionally, the device is suitable for use in process monitoring applications, motor speed controllers, and in power management.

The LM293ADR also has excellent noise immunity as it includes a built-in Schmitt trigger on the output which reduces noise related false operation (hissing). This ensures that the device is resistant to most electrical interference which is important in applications where a false activation would cause problems.

Working Principle of the LM293ADR

The LM293ADR works according to the common input-output relation of differential amplifiers. The set of inputs is split into the two comparators (A and B) and a differential amplifier. The differential amplifier´s task is to shift the input signal by a certain amount. This means that at the origin the signal is ‘’zeroed’’ out and the two comparators A and B start working in a different direction towards the set voltage and current limit.

The two comparators A and B can be enabled and disabled separately. If they are enabled they measure and compare the input signal against the user-defined voltage and current limit. Once the limit has been reached, the corresponding outpout of the comparator goes high. The comparator´s output signal is also inverted via the differential amplifier enabling the user to distinguish the high and the low, so he knows which exact comparator triggered in each situation.

Conclusion

As a summary, the LM293ADR is an ideal choice for applications requiring precise measurement of variable limits or comparisons. It functions as a low cost, general purpose differential amplifier with two independent adjustable current-limit comparators. The two adjustable current-limit comparators can be enabled and disabled independently allowing for precise comparisons based on user’s requirements. The LM293ADR also has excellent noise immunity due to the built-in Schmitt trigger on the output. It is suitable for various applications such as process monitoring, medical systems, and motor speed controllers.

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