AD5161BRM5

Overview

The AD5161BRM5 is a single-channel, 256-position digital potentiometer from Analog Devices. It features a nominal end-to-end resistance of 5 kΩ with a tolerance of ±30% and a temperature coefficient of 45 ppm/°C. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V, consuming a typical supply current of 8 µA. It offers a pin-selectable interface compatible with SPI or I²C protocols. The unit is housed in a compact MSOP-10 package (3 mm × 4.9 mm) and supports an operating temperature range from −40°C to +125°C.

Feature Summary

• Pin-selectable SPI or I²C digital interface for flexible system integration
• 256-position resolution with linear taper and full read/write capability for the wiper register
• Low power consumption with 8 µA typical supply current and shutdown mode
• Compact MSOP-10 package suitable for space-constrained designs

Applications

• Replacement for mechanical potentiometers in new electronic designs
• Transducer adjustment for pressure, temperature, position, chemical, and optical sensors
• RF amplifier biasing circuits
• Gain control and offset adjustment in signal conditioning chains

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact resistance value and packaging type. Ensure that the selected variant matches the required interface configuration and thermal specifications for the target application environment.

Selection Notes

Select this component when a solid-state replacement for a mechanical potentiometer is required in portable or battery-operated systems due to its low power profile. Confirm that the 5 kΩ resistance value aligns with the circuit's impedance requirements and that the MSOP-10 footprint fits the PCB layout constraints.

Part Context

The AD5161BRM5 belongs to the AD5161 family of 256-position digital potentiometers. This series provides enhanced resolution and reliability compared to traditional mechanical components. The BRM5 designation specifically indicates the 5 kΩ resistance variant within the broader product line that also includes 10 kΩ, 50 kΩ, and 100 kΩ options.

Replacement Considerations

Direct functional replacements include other AD5161 variants such as AD5161BRMZ10 or AD5161BRMZ50 for different resistance values. For dual-channel applications, consider the AD5162. Verify pin compatibility and interface settings when substituting with similar digital potentiometer ICs.

FAQ

How is the digital interface selected between SPI and I²C?

The interface is selected via the DIS (Digital Interface Select) pin. Tying DIS low engages SPI mode, while tying it high enables I²C mode.

What is the maximum clock frequency for the SPI interface?

The maximum SPI clock frequency (fCLK) is specified as 25 MHz in the electrical characteristics table.

Does the device retain its wiper setting after power loss?

No, the wiper memory is volatile. However, the device features a power-on preset that automatically sets the wiper to midscale upon power-up.