Analog Devices Inc. AD22285-R2

Overview

AD22285-R2 from Analog Devices is a dual-axis iMEMS® accelerometer IC designed for high-g automotive crash sensing and vibration monitoring. It delivers ratiometric voltage outputs with ±50 g/±50 g full-scale range on X and Y axes, 0.2% full-scale linearity, 400 Hz 2-pole Bessel filter, and operates over −40°C to +105°C. Its ceramic LCC package supports front/side airbag deployment systems.

For engineers reviewing the AD22285-R2 datasheet, AD22285-R2 pinout, AD22285-R2 application, or AD22285-R2 equivalent, key selection criteria include its self-test capability, differential EMI-resistant architecture, ±50 g symmetric range, low 1.1–1.4 mg/√Hz noise density, and automotive-qualified temperature stability.

Technical Context

The AD22285-R2 implements a fully differential surface-micromachined sensor with electrostatic force feedback and zero-net-force operation. Its 200 kHz excitation clock drives complementary square waves across fixed/movable capacitor plates, generating a linear feedback signal proportional to acceleration.

Signal conditioning includes two independent 400 Hz 2-pole Bessel filters (XOUT/YOUT), ratiometric output scaling relative to VDD, and integrated self-test via digital ST pin activation. The device achieves 8× full-scale electrical linearity and 24 kHz resonant frequency-well above its signal bandwidth-to avoid resonance-induced distortion.

Key Specifications

Pinout & Package

AD22285-R2 is housed in an 8-terminal ceramic leadless chip carrier (LCC) measuring 5 mm × 5 mm × 2 mm (E-8-1 package), with gold-plated terminations qualified for Sn/Pb and Pb-free reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-axis high-g accelerometer applications.

Compared with AD22284-R2 and AD22286-R2, the AD22285-R2 provides balanced ±50 g dual-axis performance ideal for systems requiring equal high-g tolerance on both axes without sacrificing resolution or introducing axis asymmetry in signal processing.

Availability

AD22285-R2 is available at Aetrix Electronics and suitable for automotive airbag control units, industrial shock data loggers, and structural vibration monitors requiring stable component supply across extended production lifecycles.

Supply support for AD22285-R2 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing and control.

The ADXL278 family-including AD22285-R2-is engineered for automotive safety systems, delivering robust, temperature-stable dual-axis acceleration measurement with integrated diagnostics and EMI resilience.

FAQ

What is the full-scale acceleration range of the AD22285-R2?

The AD22285-R2 has a symmetric full-scale range of ±50 g on both the X and Y axes. This range is factory-trimmed and guaranteed across the −40°C to +105°C operating temperature range. The device maintains 0.2% nonlinearity and ratiometric output scaling throughout this range, making it suitable for high-dynamic automotive crash sensing where precise g-level quantification is required. Each axis operates independently with matched sensitivity and offset characteristics.

How does the self-test function work on the AD22285-R2?

The AD22285-R2 implements a comprehensive mechanical-electrical self-test activated by a logic-high signal on the ST pin (Pin 4). When asserted, it applies electrostatic force to the sensor's movable frame, inducing a known displacement that propagates through the full signal chain - from differential capacitance change to demodulation, amplification, and filtering - resulting in a predictable 440–660 mV (X) or 304–456 mV (Y) output shift. This validates end-to-end functionality without external stimulus and satisfies ASIL-B diagnostic coverage requirements.

Is the AD22285-R2 pin-compatible with other ADXL278 variants?

Yes, the AD22285-R2 shares identical pin configuration, terminal functions, and 8-lead ceramic LCC (E-8-1) package with AD22284-R2 and AD22286-R2. All three variants use the same VDD/VDD2/VDD3 power inputs, XOUT/YOUT analog outputs, COM reference, ST control, and NC terminal layout shown in Figure 2 of the ADXL278 Rev. B datasheet. No PCB redesign is needed when substituting between these models - only firmware or calibration adjustments may be required due to differing full-scale ranges and sensitivities.

What is the recommended power supply decoupling for the AD22285-R2?

For stable operation, the AD22285-R2 requires a 0.1 µF ceramic capacitor placed as close as possible to each VDD pin (Pins 1, 7, and 8) with short, low-inductance traces to COM (Pin 3). In electrically noisy environments - especially where 200 kHz clock harmonics may couple onto the supply - adding a 50 Ω ferrite bead in series with the supply line and a 1–4.7 µF bulk tantalum or ceramic capacitor in parallel further suppresses high-frequency interference. This prevents clock noise from modulating into the output via the CFSR mechanism.

Does the AD22285-R2 meet automotive qualification standards?

Yes, the AD22285-R2 is manufactured and tested to meet automotive reliability requirements, including operation across −40°C to +105°C and qualification per AEC-Q100 stress test standards. While the ADW22285 variant carries explicit automotive grade marking, the AD22285-R2 shares the same die, package, and process flow - and is widely deployed in production airbag control units. Its differential architecture, self-test capability, and robust ceramic LCC packaging align with ISO 26262 functional safety demands for ASIL-B systems.