AD5243BRM10-RL7

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• AD5243BRM10-RL7 Application Field and Working Principle
• Data Acquisition: Digital Potentiometers

The AD5243BRM10-RL7 digital potentiometer is a single-channel, 9-bit digital potentiometer that offers a resolution of up to 256 steps. It is an effective solution for applications where adjustable or programmable impedance, attenuation, or gain setting precision is required. The user can set the resistance value through the low power 50 kΩ, single-channel device, selected either by a linear or logarithmic stepping, or by a continuous wiper motion.

The AD5243BRM10-RL7 is a thru-hole device that offers the benefit of a small 1.27 mm × 1.27 mm footprint for low-profile applications. It is designed for use in low-voltage, low-current applications and features a logic operating voltage of 2.7 V to 5.5 V. It also features a low operating current of 0.1 μA, which provides very low quiescent power consumption. This, coupled with the low voltage, makes it suitable for battery-powered applications, such as vehicle automation, medical sensors, and remote controls.

The potentiometer features non-volatile wiper setting storage which makes it an ideal choice for controlling gain, attenuation or impedance setting in applications where multiple settings or adjustments are required and must remain stable. To ensure reliable non-volatile data storage, the device can self-program, meaning it is able to re-write its own non-volatile memory periodically and also on demand. This also eliminates the need for any external programming or control of the device.

The AD5243BRM10-RL7 offers a low resistance element, which is adjustable over a range of approximately 50 kΩ to 3.2 MΩ, depending on the logic voltage that is applied. It also offers an adjustable wiper resistance from 0 Ω to 10 kΩ, allowing for easy impedance control. The device is ESD compliant, featuring a 15 kV minimum Human Body Model (HBM) ESD rating.

The AD5243BRM10-RL7 has ideal applications in audio, RF, automotive, and medical markets. In the audio market, it is suitable for adjusting the electronic volume, balance control, bass or treble control and sound processing. In the automotive market, it is suitable for active noise cancellation, fuel gauge calibration, electronic parking systems, and carbon canister activation. In medical markets, the device is suitable for medical sensor value adjustment, thermometer calibrations, and electrocardiographs (ECG) monitor adjustments.

In terms of the device’s working principle, its basic building blocks include an EEPROM memory cell, decoder, drivers, and a control logic circuit. The EEPROM cell stores the preset values for the 9-bit resolution and is adjustable over a range of 50 kΩ to 3.2 MΩ, depending on the logic voltage. The decoder deciphers the address and data bits from the serial control data packet, and the drivers invert the control logic and engage the appropriate I/O rings of the EEPROM to effect the desired setting.

In conclusion, the AD5243BRM10-RL7 is a single-channel non-volatile digital potentiometer that offers a resolution of up to 256 steps and is suited for low power and low voltage applications. It features a small 1.27 mm × 1.27 mm footprint and a low operating current of 0.1 μA, making it an ideal choice for battery-powered applications such as vehicle automation, medical sensors, and remote controls. The adjustable wiper resistance of 0 Ω to 10 kΩ allows for easy impedance control and makes it suitable for applications where adjustable or programmable impedance, attenuation, or gain setting precision is required.

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