AD5161BRMZ100-RL7

Overview

The AD5161BRMZ100-RL7 is a single-channel, 256-position digital potentiometer from Analog Devices. It features an end-to-end resistance of 100 kΩ with a ±30% tolerance 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 supports both SPI and I²C interfaces via a pin-selectable Digital Interface Select (DIS) pin. The wiper settings are volatile, and the unit is housed in a compact MSOP-10 package.

Feature Summary

• Pin-selectable SPI or I²C compatible serial interface
• 256-position resolution with linear taper
• Single supply operation from 2.7 V to 5.5 V
• Power-on preset to midscale position

Applications

• Mechanical potentiometer replacement in new designs
• Transducer adjustment for pressure, temperature, and optical sensors
• RF amplifier biasing
• Gain control and offset adjustment circuits

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the required reel packaging quantity. Confirm that the DIS pin configuration matches the target system's communication protocol, as the hardware interface mode is fixed by the physical connection of this pin during operation.

Selection Notes

Select this component when a 100 kΩ nominal resistance is required. Ensure the application can accommodate the ±30% initial resistance tolerance. Verify that the system power supply remains within the 2.7 V to 5.5 V range to maintain specified electrical characteristics and linearity performance.

Part Context

This part belongs to the AD5161 family of 256-position digital potentiometers. The BRMZ suffix indicates the commercial temperature grade (-40°C to +125°C) and the MSOP-10 surface-mount package. The '100' designation specifies the 100 kΩ end-to-end resistance value.

Replacement Considerations

Direct replacements include other AD5161 variants with different resistance values (e.g., AD5161BRMZ10 for 10 kΩ). Cross-family substitution requires verifying interface compatibility and package dimensions.

FAQ

How is the digital interface mode selected?

The interface mode is determined by the state of the DIS pin. Tying DIS low selects SPI mode, while tying DIS high selects I²C mode.

What happens to the wiper position upon power-up?

An internal power-on preset mechanism automatically places the wiper at the midscale position when power is applied.

Can multiple devices be connected on a single bus?

Yes. In SPI mode, devices can be daisy-chained using the SDO output. In I²C mode, up to two devices can share the same bus by utilizing the programmable address bit AD0.