AD5174BRMZ-10-RL7

Overview

The AD5174BRMZ-10-RL7 is a single-channel, 1024-position digital rheostat from Analog Devices. It features a nominal resistance of 10 kΩ with a temperature coefficient of 35 ppm/°C in rheostat mode. The device supports SPI-compatible interfaces and includes 50-times programmable (50-TP) nonvolatile memory for wiper position storage. It operates on a single supply of 2.7 V to 5.5 V or dual supplies of ±2.5 V to ±2.75 V. Key electrical parameters include a resolution of 10 bits, resistor tolerance of ±15%, and supply current of 1 μA. The component is available in compact MSOP-10 packages.

Feature Summary

• 1024-position resolution with 10 kΩ nominal resistance
• 50-times programmable (50-TP) nonvolatile memory
• SPI-compatible serial interface with readback capability
• Dual-supply operation: ±2.5 V to ±2.75 V

Applications

• Mechanical rheostat replacements
• Op-amp variable gain control
• Instrumentation gain and offset adjustment
• Programmable voltage-to-current conversions
• Sensor calibration

Procurement Notes

Verify the package type upon ordering, as the AD5174 series is offered in both MSOP-10 and LFCSP-10 configurations. Confirm that the specific part number corresponds to the required housing style for PCB layout compatibility. Ensure the design accounts for the external 1 μF capacitor required on the EXT_CAP pin for 50-TP memory programming operations.

Selection Notes

Select this component when a high-resolution digital rheostat with persistent memory settings is required. The 50-TP feature allows permanent storage of up to 50 distinct resistance values without external power. Consider the ±15% resistor tolerance and 35 ppm/°C temperature coefficient for precision applications. Verify that the system can support the required SPI clock rates up to 50 MHz and provides adequate decoupling for the 4 mA programming current spikes.

Part Context

This part belongs to the AD5174 family of single-channel digital rheostats. The 'BRMZ' suffix indicates the B grade (±15% tolerance), MSOP package, and 10 kΩ resistance value. The '-RL7' suffix denotes reel packaging. Other variants in the family may offer different resistance values, package types like LFCSP, or higher precision grades.

Replacement Considerations

Direct substitutes within the same family include other AD5174 variants with different resistance values or packages. For cross-family replacement, verify that the substitute offers comparable 10-bit resolution, SPI compatibility, and similar supply voltage ranges. Ensure the replacement supports the required 50-TP memory functionality if persistent settings are critical.