DS1809U-100+T&R

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Data Acquisition - Digital Potentiometers encompasses a variety of electronic instruments used for reading and recording physical phenomena, and for analyzing and controlling signals. The DS1809U-100+T&R is a digital potentiometer and a part of the data acquisition family. By working in the form of a potentiometer or voltage divider, this digital potentiometer can sense or generate an analog voltage while being handled by microprocessors or digital logic circuit. Digital potentiometers find their application mainly in audio applications, motor control systems and where adjustable voltage or resistance is required.

Application Field

By utilizing microprocessor or digital logic, the DS1809U-100+T&R can provide many functions, such as pre-emphasis, 3 dB crossover, temperature compensation, picking up frequency and filtering noise, through adjusting resistance and voltage. The main application fields are audio application and motor control systems. The most common application of the DS1809U-100+T&R is to adjust pre-emphasis characteristics for two-wire audio device. This digital potentiometer can also be used in multi-channel amplifier in order to adjust master volume as well as channel balance. In the field of motor control systems, the DS1809U-100+T&R is qualified for torque and speed control in reversible motor which enables variations in field strength without changing armature speed.

Working Principle

The DS1809U-100+T&R consists of two resistors, a terminal resistive element and resistor array integrated into a single chip. The terminals of this device are connected to silicon sensing elements and one terminal carries only a constant DC voltage while the other such terminal carries the varying DC voltage. This varying DC voltage is usually integrated by the signal and converted into digital form by A/D converter. By adjusting the signal the resistance path is altered and relevant voltage changes can be obtained.

The DS1809U-100+T&R works in two modes: the voltage trim mode and the resistance trim mode. In voltage trim mode, the resistance is changed and the voltage is monitored, whereas in resistance trim mode, the voltage is changed and the resistance is monitored. The adjustment of the signal is done by an input voltage which is applied between the potentiometer\'s terminals. Depending on the level of this input voltage, the resistance is changed between a minimum and a maximum designated value.

These steps ensure that the output voltage of the device is adjusted according to the input voltage. Thus, the DS1809U-100+T&R is used in applications that require precise and precise control of the resistance and voltage.

Conclusion

The DS1809U-100+T&R is a digital potentiometer which finds applications in audio and motor control systems. By applying an input voltage between the terminals, the resistance present in the potentiometer can be altered. The device works in two modes: voltage trim mode, in which the resistance is changed and the voltage is monitored, and resistance trim mode, in which the voltage is changed and the resistance is monitored. The DS1809U-100+T&R helps to make the system user friendly and cost effect by making use of digital technology.

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