Analog Devices Inc. AD22302

Overview

AD22302 from Analog Devices is a monolithic two-axis (XY) automotive-grade iMEMS® accelerometer with orthogonal in-plane sensor axes, ±70g X-axis and ±35g Y-axis full-scale ranges, 400 Hz 2-pole Bessel filter, ratiometric analog voltage outputs, and integrated self-test functionality. It serves as a crash-sensing element in front/side airbag deployment systems and impact-angle determination.

For engineers reviewing the AD22302 datasheet, AD22302 pinout, AD22302 application, or AD22302 equivalent, key selection considerations include its dual-axis orthogonal alignment, axis-specific sensitivity (5.4 mV/V/g X, 11 mV/V/g Y), ±0.2% full-scale nonlinearity, -40°C to +105°C automotive temperature operation, and 8-pin LCC package with three independent supply pins (Vdd, Vdd2, Vdd3).

Technical Context

The AD22302 implements a fully differential surface-micromachined capacitive sensor architecture with electrostatic force feedback and zero-net-force control, enabling DC-coupled acceleration measurement. Its dual-axis structure shares a single monolithic die with mechanically orthogonal X/Y sensing elements aligned within the chip plane.

Each axis features independent signal conditioning: dedicated demodulation amplifiers, axis-specific pre-filter headroom (420 g X, 210 g Y), and ratiometric output scaling referenced to its respective supply rail. The 400 Hz Bessel filter ensures linear phase response critical for crash pulse fidelity, with ≤6 Hz drift over temperature.

Key Specifications

Pinout & Package

AD22302 uses an 8-pin leadless chip carrier (LCC) with exposed thermal pad (package code: LCC-8). Pin 3 (COM) connects internally to the metal lid for EMI shielding; pins 1, 7, and 8 are independent power rails (Vdd3, Vdd, Vdd2) supporting isolated analog supply domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD22301 and MMA8452Q, the AD22302 delivers monolithic XY integration with analog pulse fidelity, deterministic self-test, and automotive-grade supply isolation-critical for ASIL-B airbag controller interfaces where latency, signal integrity, and functional safety validation are mandatory.

Availability

AD22302 is available at Aetrix Electronics and suitable for frontal crash detection, side-impact sensing, and impact angle determination requiring stable component supply in automotive safety-critical production programs.

Supply support for AD22302 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing, power management, and connectivity.

The AD22302 belongs to Analog Devices' iMEMS® automotive accelerometer product line, engineered specifically for airbag control units and crash event recorders demanding DC-coupled accuracy, EMI resilience, and AEC-Q100 qualification.

FAQ

What is the primary function of the AD22302 in automotive safety systems?

The AD22302 serves as a dual-axis crash-sensing transducer in airbag control units, directly converting vehicle acceleration into ratiometric analog voltage outputs for X and Y axes. Its ±70g/±35g asymmetric range, 400 Hz Bessel filter, and monolithic orthogonal structure enable precise front/side impact discrimination and impact angle calculation-core functions required for ASIL-B compliant deployment decisions in the AD22302.

How does the AD22302 achieve EMI/RFI immunity in noisy automotive environments?

The AD22302 employs a fully differential capacitive sensor and signal path, combined with COM-connected metal lid shielding and separate supply rails (Vdd, Vdd2, Vdd3) to reject common-mode noise. Its architecture achieves >60 dB rejection of 100 MHz RFI-validated per CISPR-25-and eliminates ground-loop interference critical for reliable operation near ignition systems and infotainment modules in the AD22302.

What is the purpose of the three independent supply pins (Vdd, Vdd2, Vdd3) on the AD22302?

Vdd powers the X-axis signal chain and timing generator; Vdd2 supplies the demodulator and amplifier bias circuits; Vdd3 powers the Y-axis signal chain. This separation minimizes crosstalk between axes, improves PSRR, and enables independent noise filtering-essential for maintaining <1° axis alignment accuracy and preventing false triggers in the AD22302's safety-critical outputs.

Can the AD22302 self-test function verify both mechanical and electrical integrity?

Yes-the AD22302 self-test applies a calibrated electrostatic force to the sensor frame via pin 4, inducing full mechanical displacement that propagates through the entire signal chain: differential capacitance change → demodulation → amplification → filtering → output stage. The resulting voltage step at XOUT/YOUT confirms end-to-end functionality, making it a complete diagnostic for the AD22302 in ISO 26262-compliant systems.

Why does the AD22302 specify different pre-filter headroom values for X and Y axes (420 g vs. 210 g)?

The asymmetry matches real-world crash physics: frontal impacts generate higher peak g-forces than side impacts. The AD22302's 420 g X-axis headroom prevents clipping during severe frontal crashes, while the 210 g Y-axis headroom optimizes resolution for lower-magnitude side events-ensuring maximum dynamic range utilization without sacrificing signal-to-noise ratio in either axis of the AD22302.