Analog Devices Inc. ADA4254ARUZ

Overview

ADA4254ARUZ 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), three scaling gains (1/1.25/1.375 V/V), and integrated excitation current sources for RTD biasing. 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 process control front ends.

For engineers reviewing the ADA4254ARUZ datasheet, ADA4254ARUZ pinout, ADA4254ARUZ application, or ADA4254ARUZ equivalent, key selection criteria include its ±60 V protected multiplexer, SPI-controlled gain calibration with ROM coefficients, 7 GPIOs supporting external mux control and wire-break detection, and dual-supply architecture separating high-voltage analog inputs (±28 V), output amplifier (AVDD/AVSS), and digital core (DVDD/DVSS).

Technical Context

The ADA4254ARUZ integrates a zero-drift chopper-stabilized input stage with a programmable gain stage and dedicated output amplifier, enabling simultaneous high-precision dc measurement and robust high-voltage input handling. Its ±60 V protected input multiplexer supports two differential input channels with EMI filtering, while internal fault detection-including wire-break test currents (0.25–16 μA), analog/digital error registers, and CRC-protected SPI-supports SIL-certifiable system design.

Digital control is implemented via a 5 MHz SPI interface with checksum support, sequential chip select mode, and 7 configurable GPIOs that serve as excitation current controls, external multiplexer drivers, or fault interrupt outputs. Gain calibration uses factory-programmed ROM coefficients to reduce gain error to <±0.01% across all 36 gain combinations, with drift limited to ±0.4 ppm/°C at G = 64 V/V and scaling gain 1 V/V.

Key Specifications

Pinout & Package

ADA4254ARUZ is packaged in a 24-lead TSSOP (RU-24) with exposed pad connected to VSSH. Pin functions are electrically validated per Analog Devices' Rev. B datasheet, Figure 6 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8253ARMZ and LTC6915IGN#PBF, ADA4254ARUZ uniquely combines ±60 V input protection, factory-calibrated 36-gain flexibility, integrated RTD excitation, and SIL-supporting diagnostics-making it the only drop-in solution for certified industrial process I/O modules.

Availability

ADA4254ARUZ is available at Aetrix Electronics and suitable for universal process control front ends, high-channel industrial data acquisition systems, and test & measurement instrumentation requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for ADA4254ARUZ 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 Norwood, MA, with R&D and manufacturing operations worldwide.

The ADA4254 product line was designed specifically for industrial process control and precision measurement applications demanding robust high-voltage input handling, zero-drift dc accuracy, and integrated diagnostics-all in a single IC.

FAQ

What is the maximum input voltage the ADA4254ARUZ can withstand without damage?

The ADA4254ARUZ features ±60 V overvoltage protection on all four input terminals (+IN1, −IN1, +IN2, −IN2), meaning it can survive transient inputs up to 60 V beyond either supply rail (VSSH or VDDH). Absolute maximum ratings specify input voltage range as VSSH − 60 V to VSSH + 60 V, verified per Table 3 of the Rev. B datasheet. This eliminates need for external TVS diodes in 24 V/48 V PLC I/O designs.

Does the ADA4254ARUZ require external components for RTD excitation?

No, the ADA4254ARUZ includes two integrated excitation current sources: IOUT_LV (referenced to AVSS) and IOUT_HV (referenced to VSSH), each programmable from 100 μA to 1500 μA with ±3% initial tolerance and ±200 ppm/°C drift. These sources directly bias 2-, 3-, or 4-wire RTDs, removing the need for external current DACs or op-amp-based sources in temperature measurement circuits.

How does the ADA4254ARUZ achieve its ±0.01% gain accuracy?

The ADA4254ARUZ achieves <±0.01% gain error using factory-programmed calibration coefficients stored in on-chip ROM. During operation, the device applies these coefficients in real time to correct gain nonlinearity and drift. This eliminates the need for system-level calibration routines or external trim components, and is validated across all 36 gain settings including G = 128 V/V with 1.375 V/V scaling.

Can the ADA4254ARUZ operate with a single 24 V supply?

Yes, the ADA4254ARUZ supports asymmetric supplies: VDDH may be set to +24 V and VSSH to 0 V (ground), satisfying the minimum ±5 V differential requirement (VDDH − VSSH ≥ 10 V). In this configuration, IOUT_HV remains functional, and input protection thresholds adjust accordingly (e.g., positive MUX threshold = VDDH − 0.9 V = +23.1 V). Full specifications are guaranteed across VDDH − VSSH = 10 V to 56 V.

What fault detection features does the ADA4254ARUZ provide for safety-critical systems?

The ADA4254ARUZ includes multiple hardware-enforced fault detection features: wire-break detection using programmable test currents (0.25–16 μA), analog/digital error registers with maskable interrupts, CRC-protected SPI transactions, and internal overvoltage/overcurrent comparators. These features are documented in Sections 17–21 of the Rev. B datasheet and support IEC 61508 SIL-2 certification when used per Analog Devices' functional safety manual.