DS1804Z-050/T&R

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Digital potentiometers, also known as digital potentiometers and digipots, are a class of linear analog digital-controlled resistors. Digital potentiometers are typically used for a variety of functions within audio and video applications, such as volume or gain control and voltage division. The DS1804-050/T&R is a digital potentiometer from Maxim Integrated, which is used in a range of applications from switching and resistor sensing to automotive and industrial. In this article, we will discuss the application field and working principle of the DS1804-050/T&R.

Overview of the DS1804-050/T&R

The DS1804-050/T&R is the smallest single-channel digital potentiometer available on the market. It features a non-volatile memory that can be programmed or written in real-time logically. It is a 3-Terminal, 10-bit resistor with a resolution of 5kΩ to 25kΩ and a voltage of 2-6V. It is capable of providing up to 20mA of current with a maximum of up to 400mV of noise immunity. The device features a non-volatile memory for storing a digital value that is retained until power-down.

Application Field of DS1804-050/T&R

The DS1804-050/T&R is used in many applications including;

• Gain control – The device can be used to control the gain of an audio signal when used in amplifier circuits.
• Switching – It can be used to switch between various resistors, such as switching between sets of resistors in a bridge circuit.
• Resistor sensing – It can be used to determine, measure, and control the resistance of a resistor when used in resistance sensing applications.
• Automotive – The device is used in a number of automotive applications, such as vehicle control systems and audio systems.
• Industrial – The device is used for a variety of industrial applications such as temperature sensing, level sensing, and pressure sensing.

Working Principle of DS1804-050/T&R

The unique feature of digital potentiometers is that their resistance is adjusted by two digital input pins and one digital output pin. The two inputs control the waveform, while the output pin produces a voltage that is proportional to the waveform of the two inputs. The Resistance Variation Curve (RVC) diagram above illustrates the dynamic range of the waveform. When both pins are at the same voltage level, the output will be 0 and the resistance is equal to the minimum value. As either of the inputs increases the voltage level, the resistance increases. This process continues until the maximum resistance is reached.

The device is also equipped with an internal control register that stores a binary representation of the position of the wiper contact. This register is updated periodically to ensure that the position of the wiper contact is constantly adjusted, resulting in a smooth, continuous resistance transition.

In addition, the device also features a power-down mode, which allows the user to safely store the data in the internal control register, preventing unexpected changes to the resistance value.

Conclusion

The DS1804-050/T&R is a single-channel digital potentiometer from Maxim Integrated, which is used in a range of applications from switching and resistor sensing to automotive and industrial. The device features a non-volatile memory for stored digital values, which is retained until power-down. It is also capable of providing up to 20mA of current with a maximum of up to 400mV of noise immunity. The device is used in a number of applications such as gain control, switching, resistance sensing, automotive, and industrial applications. The device is additionally equipped with an internal control register that stores a binary representation of the position of the wiper contact.

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