ADA4255ACPZ

Overview

The ADA4255ACPZ is a zero drift, high voltage programmable gain instrumentation amplifier with an integrated bipolar charge pump. It provides 36 precision gains from 1/16 V/V to 176 V/V and features ±60 V protected 2:1 input multiplexing. Key electrical parameters include a maximum input offset voltage of ±14 μV, a maximum drift of ±0.08 μV/°C, and a minimum CMRR of 111 dB at G = 1 V/V. The device operates on supplies between 2.7 V and 5.5 V, draws 15.6 mA, and functions within a temperature range of −40°C to +105°C in a 28-lead LFCSP package.

Feature Summary

• Zero drift architecture self-calibrates DC errors and low-frequency noise for excellent precision across the operating temperature range.
• Integrated bipolar charge pump generates internal high-voltage supplies to enable wide input voltage ranges without lowering input impedance.
• Robust ±60 V protected 2:1 input multiplexer allows direct connection to industrial sensors while maintaining isolation requirements.
• Includes excitation current source output for biasing sensors such as resistance temperature detectors (RTDs).

Applications

• Universal process control front ends
• Data acquisition systems
• Test and measurement systems
• System power monitoring

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and thermal specifications. Ensure that the supply voltages and load conditions align with the absolute maximum ratings defined in the datasheet. Confirm availability through authorized distributors as stock levels fluctuate. Check for moisture sensitivity classification if reflow soldering is required.

Selection Notes

Select this component when high DC precision and wide dynamic range are required in industrial environments. The integrated charge pump simplifies isolation design by eliminating external high-voltage generation components. Consider the 36 available gain settings for flexible sensor interfacing. Evaluate the GPIO capabilities and SPI interface for system integration needs.

Part Context

The ADA4255 belongs to Analog Devices' family of precision programmable gain instrumentation amplifiers designed for robust industrial applications. It complements companion products such as ADCs (AD4007, AD7768) and voltage references (ADR4550). The device addresses challenges in process control by integrating signal conditioning, protection, and digital control into a single compact package.

Replacement Considerations

No public confirmed substitute part numbers are documented.