AD5170BRM50

Overview

The AD5170BRM50 is a single-channel, 256-position digital potentiometer from Analog Devices, featuring a nominal end-to-end resistance of 50 kΩ. It utilizes two-time programmable (TTP) fuse link technology for permanent resistance setting retention. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and communicates via an I²C-compatible 2-wire serial interface. Key electrical parameters include a maximum supply current of 6 µA, a temperature coefficient of 35 ppm/°C, and a typical power-up settling time of 5 µs. It is housed in a compact 10-lead MSOP package.

Feature Summary

• Two-time programmable (TTP) fuse link technology allows unlimited adjustments prior to permanent programming and supports OTP overwrite with user-defined presets.
• I²C-compatible 2-wire serial interface with full read/write capability for the wiper register and extra address decode pins (AD0, AD1).
• Power-on preset to midscale ensures a known initial state upon startup.
• Low power consumption with a maximum supply current of 6 µA and wide operating temperature range from −40°C to +125°C.

Applications

• Systems calibration and permanent factory PCB settings
• Replacement for mechanical trimmers in new designs
• Transducer adjustment for pressure, temperature, position, chemical, and optical sensors
• RF amplifier biasing and gain control

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'RM' corresponds to the MSOP-10 package variant. Check for RoHS compliance status as indicated in official documentation. Ensure handling procedures account for ESD sensitivity. Validate that the 50 kΩ resistance value matches the design requirements before procurement.

Selection Notes

Select the AD5170BRM50 when a 50 kΩ nominal resistance is required. Consider the TTP feature if permanent storage without external EEPROM is needed. Ensure the system supply voltage falls within the 2.7 V to 5.5 V range. Verify that the I²C bus speed does not exceed 400 kHz. Account for the 35 ppm/°C temperature coefficient in precision applications. The MSOP-10 package requires appropriate PCB footprint design.

Part Context

The AD5170 belongs to the AD517x family of digital potentiometers. The 'B' suffix typically denotes the industrial temperature grade (-40°C to +125°C). The 'R' indicates reel packaging, while 'M' specifies the MSOP package. The '50' designates the 50 kΩ end-to-end resistance. This part serves as a solid-state alternative to mechanical potentiometers, offering enhanced reliability and lower temperature drift.

Replacement Considerations

Direct replacements must match the 50 kΩ resistance, 256 positions, and I²C interface. Compare pinouts for compatibility, specifically the AD0 and AD1 address pins. Verify thermal resistance values if heat dissipation is a concern. Ensure the replacement supports the required OTP functionality if permanent settings are necessary.