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Analog Devices Inc. AD22284-A
- Part No.:
- AD22284-A
- Manufacturer:
- Analog Devices Inc.
- Category:
- Accelerometers
- Package:
- 8-CLCC
- Datasheet:
-
AD22284-A.pdf
- Description:
- ACCELEROMETER 35G ANALOG 8CLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,425
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Product details
Overview
AD22284-A from Analog Devices is a dual-axis iMEMS® accelerometer IC designed for automotive front/side airbag collision sensing, delivering ±35 g/±35 g full-scale measurement range on X and Y axes with ratiometric voltage outputs. It features 400 Hz 2-pole Bessel filtering, 0.2% full-scale linearity, low-noise operation (1.1 mg/√Hz typ. on Y-axis), and integrated self-test via digital ST pin. Its ceramic LCC package enables robust deployment in high-shock environments.
For engineers reviewing the AD22284-A datasheet, AD22284-A pinout, AD22284-A application, or AD22284-A equivalent, key selection criteria include its guaranteed −40°C to +105°C automotive temperature range, differential sensor architecture for EMI/RFI immunity, prefilter headroom of 280–560 g, and tight zero-g offset (±100 mV on X, ±150 mV on Y) over temperature.
Technical Context
The AD22284-A implements a fully differential capacitive sensor structure with 200 kHz electrostatic excitation and zero-force feedback control, eliminating net electrostatic force on the movable frame. Its signal path includes on-chip demodulation, amplification, and a fixed 400 Hz Bessel filter-ensuring linear phase response and minimal overshoot for crash pulse fidelity.
Self-test activation applies electrostatic force to the sensor frame via the ST pin, generating calibrated output steps (440–660 mV on X, 440–660 mV on Y at VDD = 5 V). The device uses three independent VDD pins (VDD, VDD2, VDD3) for supply decoupling and noise isolation, supporting single-supply operation from 3.5 V to 6 V with 2.2–2.9 mA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±35 g on both X and Y axes - enables accurate detection of moderate-to-high severity frontal/side impacts without clipping. |
| Linearity Error | 0.2% of full scale - ensures sub-0.07 g absolute error across full range, critical for algorithmic thresholding in airbag controllers. |
| Output Noise Density | 1.1 mg/√Hz (Y), 1.8 mg/√Hz (X) - supports reliable vibration monitoring down to low-amplitude mechanical signatures. |
| −3 dB Bandwidth | 360–440 Hz (2-pole Bessel) - preserves transient rise time of crash pulses while rejecting high-frequency road noise. |
| Zero-g Offset Drift | ±100 mV (X), ±150 mV (Y) over −40°C to +105°C - maintains calibration stability in under-hood automotive environments. |
| Self-Test Output Step | 440–660 mV per axis at VDD = 5 V - provides deterministic, repeatable verification of full signal chain integrity. |
| Supply Voltage Range | 3.5 V to 6 V - compatible with automotive battery rails including cold-crank (≈3.8 V) and load-dump (≈5.5 V) conditions. |
Pinout & Package
AD22284-A is housed in an 8-terminal ceramic leadless chip carrier (LCC) measuring 5 mm × 5 mm × 2 mm (E-8-1 package), qualified for automotive use with Pb-free and Sn/Pb solder compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Primary power supply input | Accepts 3.5 V–6 V; requires local 0.1 µF ceramic decoupling for noise rejection near 200 kHz clock. |
| VDD2 | Secondary power supply input | Isolates analog supply domains; improves PSRR and reduces coupling between sensor and output stages. |
| VDD3 | Tertiary power supply input | Dedicated supply for internal timing generator and self-test circuitry; enhances test repeatability. |
| XOUT | X-axis analog output | Ratiometric voltage (2.5 V ± full-scale swing); drives up to 1000 pF load with 0.25 V–(VDD − 0.25 V) swing. |
| YOUT | Y-axis analog output | Independent ratiometric output; enables orthogonal acceleration vector resolution without cross-talk compensation. |
| COM | Analog common reference | System ground reference for differential sensor core; must be low-impedance and separate from digital ground. |
| ST | Digital self-test enable | CMOS-compatible input (VIH ≥ 3.5 V, VIL ≤ 1 V); activates full mechanical/electrical self-test sequence. |
| NC | No connect | Terminal 5 is unconnected internally; must remain floating or grounded per PCB layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential sensor and signal path | Rejects common-mode EMI/RFI up to 10× better than single-ended accelerometers, validated by CFSR of 3 V/V at 400 kHz. |
| Integrated 400 Hz 2-pole Bessel filter | Preserves step response fidelity (minimal overshoot) for accurate crash pulse timing-critical for airbag deployment algorithms. |
| On-chip mechanical and electrical self-test | Validates sensor frame mobility, capacitor integrity, amplifier gain, and filter response with one digital command on ST pin. |
| High prefilter clipping headroom | 280–560 g headroom prevents saturation during high-slew transients before filtering, enabling clean post-filter analysis. |
| Automotive-grade temperature stability | Specified performance maintained from −40°C to +105°C, including sensitivity (±5% variation) and offset (±150 mV). |
Applications
| Frontal Airbag Deployment | Side-Impact Occupant Detection |
|---|---|
Use Scenario: Detect rapid deceleration during vehicle frontal collision to trigger airbag inflation within 20–30 ms. IC Role / Device Role / Timing Role: Primary crash sensor providing synchronized X/Y analog voltage outputs for real-time impact vector analysis. Use Value: 400 Hz Bessel bandwidth captures crash pulse rise time accurately; ±35 g range matches regulatory FMVSS 208 test profiles. |
Use Scenario: Identify lateral acceleration exceeding threshold during side-barrier or pole impact to deploy side airbags or curtain systems. IC Role / Device Role / Timing Role: Dual-axis sensing element mounted in door pillar or seat structure, delivering orthogonal acceleration data for impact localization. Use Value: Differential architecture rejects electromagnetic interference from nearby motors or infotainment systems, ensuring false-trigger immunity. |
| Vibration-Based Structural Health Monitoring | Industrial Shock Event Logging |
Use Scenario: Monitor chassis or suspension component fatigue via long-term low-g vibration spectra in commercial vehicles. IC Role / Device Role / Timing Role: Low-drift analog sensor feeding data to microcontroller ADC for FFT-based spectral analysis. Use Value: 0.2% linearity and 1.1 mg/√Hz noise density enable resolution of sub-0.1 g harmonics across 10–400 Hz operational band. |
Use Scenario: Record high-g shock events (e.g., drop testing, machinery impact) for failure root-cause analysis. IC Role / Device Role / Timing Role: High-headroom accelerometer capturing transient peaks up to 560 g prior to filtering, preserving peak amplitude integrity. Use Value: Prefilter clipping headroom exceeds typical industrial shock thresholds (100–300 g), avoiding waveform distortion during digitization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-axis high-g accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL288 | Wider full-scale range (±50 g/±50 g), higher noise density (1.4 mg/√Hz), same LCC-8 package and pinout. | Better suited for higher-energy crash events where ±35 g may saturate; requires recalibration of airbag algorithms. | Select ADXL288 when system-level testing shows AD22284-A approaches clipping during worst-case barrier impacts. |
| ADXL372 | Digital SPI output, 2000 g range, 2.5 µA standby current, 3 mm × 3 mm LGA package - no analog output or self-test pin. | Targets ultra-low-power wearable or IoT shock loggers; lacks ratiometric analog interface needed for legacy airbag ASICs. | Choose ADXL372 only for new designs with digital host processors and no requirement for analog integration or hardware self-test. |
Compared with ADXL288 and ADXL372, the AD22284-A uniquely balances automotive qualification, analog ratiometric outputs compatible with existing safety ASICs, deterministic self-test capability, and optimal ±35 g range for cost-sensitive frontal airbag systems-making it the preferred choice where legacy interface and proven field reliability are mandatory.
Availability
AD22284-A is available at Aetrix Electronics and suitable for automotive safety systems, industrial shock monitoring, and vibration diagnostics requiring stable component supply across extended production lifecycles.
Supply support for AD22284-A 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing, power management, and connectivity.
The AD22284-A belongs to the ADXL278 family of iMEMS® accelerometers, engineered specifically for automotive airbag control units and industrial shock event detection where accuracy, reliability, and EMI resilience are non-negotiable.
FAQ
What is the operating temperature range specified for the AD22284-A?
The AD22284-A is fully specified and qualified for continuous operation from −40°C to +105°C, meeting AEC-Q100 requirements for under-hood automotive placement. All key parameters-including sensitivity, zero-g offset, noise density, and self-test output-are guaranteed across this range, with no derating required.
Does the AD22284-A require external components for basic operation?
Yes-the AD22284-A requires at minimum a 0.1 µF ceramic capacitor placed close to each VDD pin (VDD, VDD2, VDD3) for effective high-frequency decoupling. Additional bulk capacitance (1–4.7 µF) is recommended if power supply noise near 200 kHz is present. No external resistors or filters are needed for nominal operation.
How does the self-test function of the AD22284-A verify sensor integrity?
The AD22284-A self-test applies electrostatic force to the sensor frame via the ST pin, causing measurable displacement that propagates through the full signal chain. This produces calibrated output steps (440–660 mV on each axis at VDD = 5 V), confirming mechanical mobility, demodulator functionality, amplifier gain, and filter response-all in a single digital command.
Can the AD22284-A be used in systems with 3.3 V supplies?
No-the AD22284-A requires a minimum supply voltage of 3.5 V and is not functional at 3.3 V. Its specified operating range is 3.5 V to 6 V, with performance guaranteed at 5 V ±5%. For 3.3 V systems, consider the ADXL3xx series, which are explicitly rated for 2.25–3.6 V operation.
What is the significance of the "-A" suffix in AD22284-A?
The "-A" suffix in AD22284-A denotes the standard commercial-grade version with RoHS-compliant packaging and tape-and-reel delivery (3,000 units per reel). It is distinct from automotive-grade variants (e.g., ADW22284ZC), which undergo additional process controls, extended reliability testing, and automotive-specific documentation.
AD22284-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iMEMS®
- Package/Case:
- 8-CLCC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y
- Acceleration Range:
- ±35g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 55
- Bandwidth:
- 400Hz
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CLCC (5x5)
AD22284-A FAQ
1.How can I place an order for AD22284-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AD22284-A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD22284-A reliable?
The price and inventory of AD22284-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD22284-A is usually 5 days.
3.What payment methods are accepted for AD22284-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD22284-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD22284-A?
AD22284-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD22284-A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD22284-A?
For technical support, including AD22284-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD22284-A requirements.
6.How does Aetrix verify that AD22284-A is sourced from the original manufacturer or authorized distributors?
All AD22284-A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD22284-A meets industry standards.
7.What is the process for return or replacement of AD22284-A?
All AD22284-A units undergo pre-shipment inspection (PSI). If there is an issue with AD22284-A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD22284-A part is unused and in its original packaging.
Return procedure for AD22284-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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