MAX138CQH+TD

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Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. ADCs (analog to digital converters) and DACs (digital to analog converters) are two common devices used in data acquisition systems. For special applications, some more specialized devices are also used. Such a device is the MAX138CQH+TD, the field of application for which and its basic working principle shall be outlined in this article.

Application Field of MAX138CQH+TD

MAX138CQH+TD is a specialized device from Maxim Integrated, belonging to its Input Signal Conditioners family. It is a monostable device that is used for pulse stretching applications. It is primarily employed for extending pulses too short to be reliably detected outside of micro-controller environment. It is ideal for automotive, industrial, medical and consumer applications.

The device is used in two main sub-fields. The first involves pulse stretching of the start of pulse train, usually in order to synchronize other devices in distributed systems. The second subfield of its application is in motor control, mainly in automotive systems. It is used in order to extend the duration of the start-up pulse of the motor, allowing it enough time to achieve the required stability and peak torque.

Working Principle of MAX138CQH+TD

A basic diagram of the device is displayed in Fig. 1. This device contains a single monostable which can be configured to generate a pulse at a given duration, dependent on a tunable threshold voltage (set externally) across the C1 capacitor. The timing resistor R Th and a capacitor C S act together to set the period of the output pulse. The internal circuit of the device consists of a controlled switch (SW1), a comparator, an adjustable voltage reference, logic circuitry and a current and temperature sensor.

When a pulse is applied to the device and its voltage exceeds the threshold level, the comparator output goes high. This signal is applied to SW1 control allowing this switch to close connecting C1 with the circuit. C1 charge is then connected to the timing circuit, causing the output signal to rise and change its state. After the duration of the pulse is over, an output signal is generated and the current flow to RC circuit is stopped. When the voltage across C1 discharge to the threshold level, SW1 is opened turning IC off.

Fig. 1: Basic Diagram of the MAX138CQH+TD device

Conclusion

In conclusion, the MAX138CQH+TD is a specialized device used for pulse stretching applications across multiple fields such as motor control, distributed systems and many more. Its working principle is based on a single monostable circuit with a tunable voltage threshold that turns the device on and allows the output pulse to be generated.

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