AD5170BRMZ2.5

Overview

The AD5170BRMZ2.5 is a single-channel, 256-position digital potentiometer manufactured by Analog Devices Inc. It features an end-to-end resistance of 2.5 kΩ and operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device utilizes a two-wire I²C-compatible serial interface for full read/write access to the wiper register. Key specifications include a maximum supply current of 6 µA, a temperature coefficient of 35 ppm/°C, and an operating temperature range from −40°C to +125°C. It is housed in a compact 10-lead MSOP package measuring 3 mm × 4.9 mm.

Feature Summary

• Two-time programmable (TTP) fuse link technology allows permanent resistance setting with unlimited adjustments prior to activation.
• I²C-compatible 2-wire serial interface supports multiple address decoding via AD0 and AD1 pins.
• Fast settling time of 1 µs typical at power-up with a –3 dB bandwidth of 4.8 MHz.
• Power-on preset defaults to midscale unless OTP programming is active.

Applications

• Systems calibration
• Electronics level setting
• Mechanical trimmers replacement in new designs
• Permanent factory PCB settings
• Transducer adjustment of pressure, temperature, position, chemical, and optical sensors

Procurement Notes

Verify the specific ordering suffix '2.5' confirms the 2.5 kΩ nominal resistance value. Confirm the 'BRM' designation indicates the industrial temperature range (-40°C to +125°C) and MSOP-10 package type. Ensure compatibility with the required I²C bus voltage levels and pull-up resistor configurations for the target system.

Selection Notes

Select this component when a non-volatile digital potentiometer with fuse-link retention is required. The 2.5 kΩ resistance value suits applications needing lower impedance compared to the 10 kΩ or 50 kΩ variants. Consider the 1 µs settling time and 4.8 MHz bandwidth for high-speed signal conditioning or biasing needs within the specified voltage range.

Part Context

The AD5170 series includes variants with 10 kΩ and 50 kΩ end-to-end resistances. All models share the same 10-lead MSOP footprint, I²C interface, and TTP functionality. The BRMZ2.5 variant specifically denotes the 2.5 kΩ resistance option within the Analog Devices DigiPOT family.

Replacement Considerations

Direct pin-compatible replacements within the AD5170 family include AD5170BRMZ10 (10 kΩ) and AD5170BRMZ50 (50 kΩ). Verify that the different resistance values meet the circuit requirements before substitution.

FAQ

What is the purpose of the Two-Time Programmable (TTP) feature?

TTP allows users to make unlimited adjustments to the resistance setting before permanently blowing a fuse to lock the value. It provides a second chance for permanent programming if the first attempt fails, though subsequent attempts may damage the fuse structure.

How does the device handle power-on states?

Upon power-up, the AD5170 presets the wiper to midscale. If One-Time Programming (OTP) has been activated, the device powers up at the user-defined permanent setting instead.

What are the voltage requirements for OTP programming?

While normal operation uses 2.7 V to 5.5 V, OTP programming requires a separate VDD_OTP supply between 5.6 V and 5.8 V capable of driving 100 mA for approximately 400 ms.