Analog Devices Inc. ADA4254ARUZ-R7

Overview

ADA4254ARUZ-R7 from Analog Devices is a zero-drift, high-voltage, low-power programmable gain instrumentation amplifier (PGIA) with ±60 V input protection, 12 binary gain steps (1/16 to 128 V/V), and three scaling gains (1/1.25/1.375 V/V). It delivers ±14 μV max input offset voltage, ±0.08 μV/°C drift, and 116 dB min CMRR at G = 1 V/V, targeting precision industrial signal conditioning in universal process control front ends.

For engineers reviewing the ADA4254ARUZ-R7 datasheet, ADA4254ARUZ-R7 pinout, ADA4254ARUZ-R7 application, or ADA4254ARUZ-R7 equivalent, key selection criteria include its integrated ±60 V protected multiplexer, SPI-controlled gain calibration with CRC, 7 GPIOs for sensor excitation and fault signaling, and dual-supply architecture supporting ±5 V to ±28 V high-voltage rails alongside separate analog/digital supplies.

Technical Context

The ADA4254ARUZ-R7 implements a zero-drift chopper-stabilized topology that self-calibrates dc errors and 1/f noise, enabling stable dc precision across −40°C to +105°C. Its input stage integrates EMI filtering and a ±60 V overvoltage-protected multiplexer for robust two-channel switching in noisy industrial environments.

Digital control is handled via a 5 MHz SPI interface with checksum (CRC) support, memory map validation, and dedicated registers for gain configuration, wire break detection, excitation current control, and GPIO function assignment. The device includes on-chip test multiplexers, internal fault detection, and sequential chip select mode for multi-device systems.

Key Specifications

Pinout & Package

ADA4254ARUZ-R7 is packaged in a 24-lead TSSOP (RU-24) with exposed pad connected to VSSH. Pin functions are fully defined in the datasheet for both TSSOP and LFCSP variants; this variant uses the TSSOP footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable gain instrumentation amplifier applications.

Compared with AD8253ARMZ and LTC6373IDE#PBF, the ADA4254ARUZ-R7 uniquely integrates ±60 V input protection, programmable excitation, wire break detection, and factory-calibrated 36-gain resolution-making it the only single-chip solution qualified for SIL-certifiable universal analog input modules.

Availability

ADA4254ARUZ-R7 is available at Aetrix Electronics and suitable for universal process control front ends, high-accuracy data acquisition systems, and test and measurement equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADA4254ARUZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The ADA4254 product line was designed specifically for industrial process control and precision sensor signal conditioning-integrating instrumentation amplification, protection, diagnostics, and digital control into one IC to simplify certified analog input design.

FAQ

What is the maximum supply voltage range supported by the ADA4254ARUZ-R7?

The ADA4254ARUZ-R7 supports a high-voltage supply range of ±5 V to ±28 V on VDDH/VSSH pins, enabling direct interface to industrial sensors operating at elevated common-mode voltages. Its analog output amplifier (AVDD/AVSS) and digital core (DVDD/DVSS) operate independently at 2.7 V to 5 V, ensuring noise isolation between domains. Absolute maximum ratings allow VDDH up to VSSH + 60 V.

How does the ADA4254ARUZ-R7 achieve its ultra-low input offset voltage drift?

The ADA4254ARUZ-R7 achieves ±0.08 μV/°C maximum input offset drift through a zero-drift chopper-stabilized architecture that performs continuous auto-zeroing of input-stage errors. This self-calibration corrects both dc offset and low-frequency 1/f noise in real time, maintaining precision across the full −40°C to +105°C specified temperature range without external trimming.

Does the ADA4254ARUZ-R7 include hardware support for functional safety certification?

Yes, the ADA4254ARUZ-R7 includes multiple hardware safety features for SIL compliance: SPI CRC checksum, internal fault detection registers (ANALOG_ERR/DIGITAL_ERR), wire break test currents, on-chip test multiplexer, and sequential chip select mode. These enable end-system diagnostics required for IEC 61508 and IEC 61000-4-5 compliance without external supervision circuitry.

Can the ADA4254ARUZ-R7 drive a differential-input ADC directly?

Yes, the ADA4254ARUZ-R7 can directly drive differential-input ADCs such as the AD7175-2 or AD4007. Its differential outputs (+OUT/−OUT) and VOCM pin allow precise setting of output common-mode level to match the ADC's input requirements. The device supports 0.0015% (16-bit) settling in 15 μs at G = 128 V/V, enabling high-speed, high-resolution sampling without external buffering.

What are the key differences between the ADA4254ARUZ-R7 and the AD8253ARMZ?

The ADA4254ARUZ-R7 offers 36 programmable gain settings (vs. 4 fixed gains on AD8253ARMZ), integrated ±60 V input protection, dual excitation current sources (IOUT_HV/IOUT_LV), wire break detection, and SPI with CRC. Unlike the AD8253ARMZ, it includes 7 GPIOs for system-level control and diagnostics-making ADA4254ARUZ-R7 suitable for SIL-certified universal analog input modules where AD8253ARMZ serves simpler, cost-sensitive DAQ applications.