AD5170BRMZ2.5-RL7

Overview

The AD5170BRMZ2.5-RL7 is a single-channel, 256-position digital potentiometer with a nominal end-to-end resistance of 2.5 kΩ and ±20% tolerance. It features a two-time programmable (TTP) architecture using 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) memory allows unlimited adjustments prior to activation, followed by two opportunities for permanent fuse programming.
• Temporary OTP overwrite feature enables dynamic adjustments after permanent programming, restoring the preset value upon subsequent power-ups.
• I²C-compatible 2-wire serial interface supports clock frequencies up to 400 kHz with extra address decode pins (AD0, AD1).
• Fast settling time of 5 µs typical during power-up and low power consumption of 6 µA maximum supply current.

Applications

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

Procurement Notes

Verify the specific suffix 'RL7' against the manufacturer's ordering guide to confirm packaging details such as reel size or tape width. Confirm that the 2.5 kΩ resistance variant matches the design requirements, as other values like 10 kΩ and 50 kΩ are available in the same family. Ensure the I²C address configuration aligns with system constraints, utilizing the AD0 and AD1 pins if multiple devices are present.

Selection Notes

Select this component when non-volatile resistance settings are required without external EEPROM. The TTP feature is suitable for applications needing a second chance at programming before finalizing the setting. Verify that the system supply voltage remains within the 2.7 V to 5.5 V range for operation, while noting that OTP programming requires a separate 5.6 V to 5.8 V supply capable of delivering 100 mA. Ensure the 2.5 kΩ resistance value fits the circuit impedance requirements.

Part Context

The AD5170 series includes variants with different nominal resistances, specifically 2.5 kΩ, 10 kΩ, and 50 kΩ. The BRMZ designation indicates the commercial temperature grade (-40°C to +125°C) and the MSOP-10 package. The suffix '-RL7' typically denotes the reel packaging format used for automated assembly. All variants share the same 256-position resolution and I²C interface capabilities.

Replacement Considerations

Direct replacements must support I²C communication and offer similar 256-position resolution. Devices with volatile memory will not retain settings after power loss unless supplemented with external storage. Ensure any substitute supports the required 2.5 kΩ resistance value and operates within the specified 2.7 V to 5.5 V supply range.