Analog Devices Inc. ADA4254ACPZ-R7

Overview

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

For engineers reviewing the ADA4254ACPZ-R7 datasheet, ADA4254ACPZ-R7 pinout, ADA4254ACPZ-R7 application, or ADA4254ACPZ-R7 equivalent, this device supports SPI-controlled gain selection, integrated EMI filtering, excitation current sources for RTD biasing, and fault detection features critical for SIL-certifiable systems.

Technical Context

The ADA4254ACPZ-R7 integrates a zero-drift chopper-stabilized input stage with a high-voltage input multiplexer and dual-output amplifier architecture. Its ±60 V protected MUX enables robust switching between two differential input channels while maintaining >1 GΩ common-mode input impedance and 17 nV/√Hz input voltage noise at 1 kHz.

Digital control is implemented via a CRC-protected SPI interface operating up to 5 MHz, with seven configurable GPIOs supporting external multiplexer control, wire-break detection, and sequential chip select. Dedicated analog and digital supply domains (VDDH/VSSH, AVDD/AVSS, DVDD/DVSS) isolate high-voltage signal paths from logic circuitry.

Key Specifications

Pinout & Package

ADA4254ACPZ-R7 is housed in a 5 mm × 5 mm, 28-lead LFCSP package with exposed pad (EPAD) requiring connection to VSSH for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8429ARMZ and INA128UA, ADA4254ACPZ-R7 uniquely combines ±60 V input protection, SPI-programmable gain, integrated excitation sources, and zero-drift precision-enabling single-chip sensor interface solutions in safety-critical, multi-sensor industrial systems without external support circuitry.

Availability

ADA4254ACPZ-R7 is available at Aetrix Electronics and suitable for universal process control front ends, data acquisition systems, and test and measurement systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADA4254ACPZ-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 Norwood, MA.

The ADA4254ACPZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for industrial process control and high-reliability data acquisition where dc accuracy, robustness, and functional safety compliance are mandatory.

FAQ

What is the maximum supply voltage range supported by the ADA4254ACPZ-R7?

The ADA4254ACPZ-R7 supports a high-voltage analog supply range of ±5 V to ±28 V (VDDH − VSSH = 10 V to 56 V), enabling direct interfacing with industrial field sensors operating at 24 V, 48 V, or higher bus voltages without external level-shifting circuitry. This specification is confirmed in Table 1 of the Rev. B datasheet under POWER SUPPLY parameters.

Does the ADA4254ACPZ-R7 include built-in protection against input overvoltage events?

Yes, the ADA4254ACPZ-R7 features an integrated ±60 V protected input multiplexer on all four analog inputs (+IN1, −IN1, +IN2, −IN2), as explicitly stated in the General Description and Absolute Maximum Ratings sections. This eliminates the need for external TVS diodes or resistor networks in harsh industrial environments.

How does the ADA4254ACPZ-R7 achieve its low input offset voltage drift?

The ADA4254ACPZ-R7 uses a zero-drift chopper-stabilized architecture that continuously self-calibrates input-stage dc errors and low-frequency 1/f noise. This results in a guaranteed maximum input offset voltage drift of ±0.08 μV/°C over −40°C to +105°C, as specified in Table 1 under Differential Offset Voltage Drift.

Can the ADA4254ACPZ-R7 drive a 24-bit ADC directly without external buffering?

Yes, the ADA4254ACPZ-R7 provides rail-to-rail differential output swing (AVSS + 0.06 V to AVDD − 0.08 V) and 2.3 MHz −3 dB bandwidth on the VOCM input, enabling direct connection to precision 24-bit sigma-delta ADCs such as the AD7175-2. Its low output noise (253 nV/√Hz) and THD of −104 dB at G = 1 V/V ensure minimal SNR degradation.

What safety certifications or features does the ADA4254ACPZ-R7 support for industrial applications?

The ADA4254ACPZ-R7 includes internal fault detection, CRC-protected SPI communication, wire-break test currents, and sequential chip select mode-all documented in the datasheet as features easing system-level Safety Integrity Level (SIL) certification. These capabilities are explicitly cited in the General Description section as supporting SIL-compliant system design.