DS1806S-050

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Digital potentiometers (DP) are a type of electronic component used to adjust the resistance between two terminals of a circuit. Most DP devices use a small, linear array of resistors that is connected to two terminals which can be digitally adjusted using a serial interface, such as I2C or SPI. DP devices are used in a number of applications such as motor control, analog-to-digital converters (ADC), voltage regulators and audio applications. The DS1806S-050 is a digital potentiometer developed by Texas Instruments.

Application Field of DS1806S-050 Digital Potentiometer

The DS1806S-050 device from Texas Instruments is a 8-pin digital potentiometer designed with a variety of features for a wide range of applications. This device is offered in both 5k-ohm and 50k-ohm varieties and can be used for both single-ended and differential-ended application requirements. The DS1806S-050 is most often used for applications that require precise control of a resistance level such as:

• Motor control – Adjustable voltage reference, current limit, and wastegate controls.
• Analog-to-Digital Converters (ADC) – Adjustable gain and offset adjustment.
• Voltage regulators – Programmatic or digitally-controlled voltage setting.
• Audio applications – Volume, tone and balance controls.

Working Principle of DS1806S-050 Digital Potentiometer

The DS1806S-050 device consists of an integrated 8 pin package that’s divided into two sections; the first section contains the actual “potentiometer”, which is composed of a linear array of resistors, and the second contains the driver circuitry which sends digital signals to control the length of the resistance array, thus varying the resistance between the two terminals. The following diagram shows a simplified schematic of the DS1806S-050:

The stability and accuracy of resistance value is determined by the number of resistors in the array, which in this case is 50. The driver circuitry is responsible for making the appropriate adjustments to the electrical signal according to the appropriate resistance value. The signal passes through the array of resistors and then onto the two terminals. When the signal passes through, the resistance is calculated to the desired value according to the signal sent from the driver circuit.

The driver circuit is usually controlled via an I2C or SPI interface. The device is set to a specific resistance value when a valid I2C or SPI interface data is transmitted from the controller. All commands are written with a two-byte data value. The first byte sent contains the byte address and the second byte contains the value to be written to the selected byte address. The lower bits of the byte address control the write operation while the upper bits control the read operation.

The DS1806S-050 has a few features that make it particularly useful for various applications. Firstly, the device features an onboard non-volatile memory, eliminating the need for an external non-volatile memory. This allows the device to store the potentiometer setting, ensuring that the same settings are retained even if power is removed from the device.

The device also has a range of operating temperature from -40°C to +85°C and an extended refresh rate that eliminates the need for manual refresh cycles when the application requires high accuracy. It also has a separate clock input for faster refresh rate if needed.

Conclusion

The DS1806S-050 is a digital potentiometer developed by Texas Instruments that is ideally suited for motor control, ADC applications, voltage regulators and audio applications. This 8-pin device uses a linear array of resistors connected to two terminals to digitally adjust resistance using a serial interface. It has a wide operating temperature range and built-in non-volatile memory that store the potentiometer setting. Overall, the DS1806S-050 is a great digital potentiometer for a variety of applications.

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