Analog Devices Inc. ADA4254ACPZ

Overview

ADA4254ACPZ 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, enabling precision signal conditioning in industrial process control front ends.

For engineers reviewing the ADA4254ACPZ datasheet, ADA4254ACPZ pinout, ADA4254ACPZ application, or ADA4254ACPZ equivalent, key selection considerations include its integrated ±60 V protected multiplexer, SPI interface with CRC, 7 GPIOs with sensor excitation and fault detection functions, and dual-supply architecture supporting ±5 V to ±28 V high-voltage rails and 2.7–5 V digital/analog supplies.

Technical Context

The ADA4254ACPZ implements a zero-drift chopper-stabilized topology that self-calibrates dc errors and 1/f noise across −40°C to +105°C, achieving <±0.01% gain error post-calibration and ±0.08 μV/°C offset drift. Its input stage integrates EMI filtering and ±60 V overvoltage protection via internal clamping diodes and series resistors.

Digital control is executed through a 5 MHz SPI interface with checksum (CRC) support, memory-mapped registers for gain configuration, wire-break detection, excitation current control, and fault monitoring. The device features dedicated high- and low-voltage excitation current sources (100–1500 μA), on-chip test multiplexer, and sequential chip select mode for multi-device synchronization.

Key Specifications

Pinout & Package

ADA4254ACPZ is packaged in a 28-lead, 5 mm × 5 mm LFCSP (CP-28-10) with exposed pad connected to VSSH. Pin 5 and Pin 28 are DNC (Do Not Connect).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8253ARMZ and LTC6915CGN#PBF, the ADA4254ACPZ uniquely integrates ±60 V input protection, dual-range excitation sources, wire-break detection, and CRC-secured SPI - reducing component count and simplifying functional safety certification for industrial field devices.

Availability

ADA4254ACPZ is available at Aetrix Electronics and suitable for universal process control front ends, data acquisition systems, and test and measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADA4254ACPZ 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 ADA4254ACPZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for industrial process control and ruggedized data acquisition where dc accuracy, overvoltage resilience, and integrated diagnostics are mandatory.

FAQ

What is the maximum input voltage range supported by the ADA4254ACPZ?

The ADA4254ACPZ supports an input operating voltage range from VSSH + 3 V to VDDH − 3 V. With ±28 V high-voltage supplies (VDDH = +28 V, VSSH = −28 V), this yields a guaranteed linear input range of −25 V to +25 V. Its ±60 V input protection extends survivability beyond that range, allowing safe exposure to transients up to ±60 V relative to VSSH without damage - critical for field-connected sensors in industrial environments. This specification applies directly to the ADA4254ACPZ.

Does the ADA4254ACPZ require external calibration for precision applications?

No, the ADA4254ACPZ includes factory-programmed gain calibration coefficients stored in on-chip ROM. When applied, these coefficients reduce gain error to <±0.01% across all 36 gain settings, eliminating the need for system-level calibration in most precision applications. The device also supports user-initiated one-time calibration via SPI commands. This built-in capability is intrinsic to the ADA4254ACPZ design and documented in its register map and gain calibration section.

How does the ADA4254ACPZ handle electromagnetic interference (EMI) in harsh industrial settings?

The ADA4254ACPZ integrates on-die EMI filters at both input pins, specifically designed to attenuate RF noise above 1 MHz that commonly couples into sensor cables in motor drives or switchgear environments. These filters are co-optimized with the ±60 V input protection structure and do not degrade dc precision or bandwidth. Measured performance shows maintained CMRR >112 dB at 60 Hz even under conducted RF noise - a feature confirmed for the ADA4254ACPZ in its EMI reduction section and typical performance curves.

Can the ADA4254ACPZ drive standard SAR ADCs directly?

Yes, the ADA4254ACPZ differential outputs (+OUT/−OUT) are fully compatible with precision SAR ADCs such as the AD7175-2 and AD4007. It delivers 0.01% settling in 10 μs at G = 1 V/V with 8 V p-p output swing, supports capacitive loads up to 500 pF, and provides rail-to-rail output swing (AVSS + 0.06 V to AVDD − 0.08 V). Its VOCM pin allows precise alignment of output common-mode voltage to match ADC reference midpoints - all verified for the ADA4254ACPZ in its dynamic response and analog output specifications.

What safety certifications does the ADA4254ACPZ support out-of-the-box?

The ADA4254ACPZ incorporates multiple hardware-level safety features required for IEC 61508 SIL-2 and IEC 62061 systems: SPI CRC checksum, internal fault detection registers (ANALOG_ERR/DIGITAL_ERR), wire-break test currents, on-chip test multiplexer, and sequential chip select (SCS) mode for synchronized multi-device operation. These are not optional add-ons but integral, production-tested functions of the ADA4254ACPZ - explicitly cited in its safety features description and register-level documentation.