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SDI 1522 SURFACE MOUNT ACCELEROMETERS
The SDI 1522 delivers reliable MEMS sensing performance in applications where thermal stability and signal clarity are critical.
Meet the SDI 1522: MEMS DC Sensing with Superior Thermal Stability and Low Noise
The Model 1522 is an industrial surface mount accelerometer engineered for applications where operating temperatures fluctuate rapidly or remain extreme over time. It offers improved bias and scale factor temperature coefficients—cut in half compared to the SDI 1521—ensuring dependable output in thermally dynamic environments. Calibrated, serialized, and tested under temperature-controlled conditions, the 1522 is trusted in industries and applications facing thermal challenges.
Key Performance Features
- Low Noise: 7 μg/√Hz Typical for ±2g Full Scale Versions
- Superior Bias & Scale Factor Temperature Coefficients
- Responds to frequencies from zero (DC) to 4000+ Hz
- High Stability and Durability
- -55 to +125°C Operation
- ±4V Differential Output
- +5 VDC, 5 mA Power
- Integrated Sensor & Amplifier
- Internal Temperature Sensor
- Nitrogen Damped & Hermetically Sealed
- Serialized for Traceability & RoHS Compliant
Thermal Stability, Low Noise, and Long-Term Durability
The Model 1522 combines enhanced temperature stability, ultra-low noise, and proven durability, making it the ideal choice for engineers operating in environments with wide or rapid temperature swings.
Exceptional Thermal Performance for Demanding Conditions
The SDI 1522 is built to operate between -55°C and +125°C and is individually conditioned in a climate chamber to ensure consistency. It outperforms standard MEMS accelerometers in thermal reliability, thanks to its reduced temperature sensitivity in both bias and scale factor.
Low Noise for Clean Signal Integrity
Engineered with a noise floor as low as 7 μg/rootHz in its ±2g configuration, the 1522 delivers high-fidelity data with minimal signal degradation. It supports vibration monitoring, tilt sensing, and instrumentation use cases where low noise MEMS accelerometers are essential.
Durability for Long-Term Operation
Encased in a nitrogen-damped, hermetically sealed package, the 1522 integrates a MEMS sense element, amplifier, and temperature sensor. It is RoHS compliant, serialized for traceability, and built to perform reliably over extended use in harsh conditions.
Compare Specifications
| g Range | Sensitivity, Differential |
Frequency Response (Typ, 3 dB) |
Frequency Response (Min, 3 dB) |
Frequency Response (Typ, 5%) |
Output Noise, Differential (RMS, Typ) |
Max. Mechanical Shock (0.1 ms) |
|---|---|---|---|---|---|---|
| g | mV/g | Hz | Hz | Hz | μg/(root Hz) | g (peak) |
| ±2 | 2000 | 0 – 525 | 0 – 300 | 0 – 250 | 7 | 2000 |
| ±5 | 800 | 0 – 800 | 0 – 420 | 0 – 400 | 12 | 2000 |
| ±10 | 400 | 0 – 1100 | 0 – 660 | 0 – 700 | 18 | 5000 |
| ±25 | 160 | 0 – 1750 | 0 – 1050 | 0 – 1300 | 25 | 5000 |
| ±50 | 80 | 0 – 2100 | 0 – 1400 | 0 – 1600 | 50 | 5000 |
| ±100 | 40 | 0 – 3000 | 0 – 1700 | 0 – 1700 | 100 | 5000 |
| ±200 | 20 | 0 – 3600 | 0 – 2100 | 0 – 1900 | 200 | 5000 |
| ±400 | 10 | 0 – 4200 | 0 – 2400 | 0 – 2000 | 400 | 5000 |
Each miniature, hermetically sealed package combines a MEMS capacitive sense element for DC measurement and a custom integrated circuit that includes a sense amplifier and differential output stage. This design ensures that the device remains relatively insensitive to temperature changes and gradients. Each package undergoes individual testing, programming, and calibration by SDI, and is marked with a serial number on its top and bottom surfaces for easy traceability. Additionally, every 1522 is accompanied by its calibration test report, displaying the actual measured bias, scale factor, linearity, operating current, and frequency response performance numbers.
Need Help Choosing the Right Accelerometer?
Performance and Package Options
Available in a leadless LCC configuration, the 1522 is compact enough for embedded systems yet rugged enough for harsh industrial environments. Despite its small footprint, it delivers consistent accuracy and durability across its full g-range offerings.
Package Dimensions
Performance – All Versions
All Models: Unless otherwise specified VDD=VR=5.0 VDC, Tc=25°C, Differential. Span = ±g range = 8000 mV
| PARAMETER | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|
| Bias Calibration Error (mV) | 16 | 40 | ± mV | |
| Bias Calibration Error (Span) | 0.2 | 0.5 | ± % of span | |
| Bias Temperature Shift (Tc= -55 to +125°C) | -50 | 0 | -50 | (PPM of span)/°C |
| Scale Factor Calibration Error 1 | 0.5 | 1 | ± % | |
| Scale Factor Temperature Shift (Tc= -55 to +125°C) | -100 | 0 | +50 | PPM/°C |
| Non-Linearity (-90 to +90% of Full Scale) 1 | 0.10 | 0.25 | ± % of span | |
| Long Term Bias Stability | 1000 | 2000 | ± PPM of span | |
| Long Term Scale Factor Stability | 500 | 1000 | ± PPM | |
| Cross Axis Sensitivity | 2 | 3 | ± % | |
| Input Axis Misalignment | 5 | 10 | ± mrad | |
| Turn-On Transient (in less than 0.5ms) | 75 | ± PPM of FS | ||
| Output Impedance | 90 | Ohms | ||
| Operating Voltage 2 | 4.75 | 5.0 | 5.25 | Volts |
| Operating Current (IDD+IVR) | 5.5 | 6.5 | mA | |
| Mass: 'L' package | 0.62 | grams | ||
| Case Operating Temperature | -55 | +125 | degrees C | |
| Storage Temperature | -55 | +125 | degrees C | |
| Max Reflow Solder Temperature | +239 | degrees C |
Note 1: For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.
Note 2: Voltages on pins other than DV, GND or VDD may exceed 0.50 volt above or below the supply voltages provided max current is <1 mA. NOTICE: Minimize exposure above 125°C for maximum lifespan. Stresses greater than those listed above may cause permanent damage to the device. These are maximum stress ratings only. Functional operation of the device at or above these conditions is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability and lifespan.
Operational Highlights
The sensitive axis of the Model 1522 is perpendicular to the bottom of the package, and with positive acceleration resulting from a positive force pushing on the bottom of the package.
The Model 1522 produces a differential ±4 volts output voltage, the value of which varies with acceleration as shown in the figure. The seismic center is located on a centerline through the dual sense elements halfway between them. Any errors due to rotation about this point are effectively cancelled by the internal electronics.
Two reference voltages, +5.0 and +2.5 volts (nominal), are required; scale factor is ratiometric to the +5.0 volt reference voltage relative to GND, and both outputs at zero acceleration are nominally the same as the +2.5 volt input.
Frequently Asked Questions
Why does the accelerometer read zero G's when it's in free fall?
All accelerometers are used to measure increasing or decreasing acceleration, and they can detect vibration because it is a change in acceleration between multiple directions. Free fall, by definition, is a static acceleration, which means the object may be moving, but its acceleration is not changing at all. SDI’s MEMS DC accelerometer technology allows it to measure free fall because it doesn’t require any change of acceleration to supply data, and therefore it will report back 0g of acceleration.
How do I choose the right g-range for my application?
The g-range of your accelerometer should match the maximum acceleration your system is expected to experience—but avoid going unnecessarily high. Selecting too high of a g-range can reduce measurement clarity, while too low of a range can cause the sensor to saturate if the acceleration exceeds its limit. Also consider the frequency response. Each Silicon Designs sensor has a MEMS sense element tuned to its specific g-range, which affects its frequency range and noise profile. Be sure to check the product datasheet or visit our How To Choose Your Accelerometer guide for more detailed recommendations. You can also reach out to our team for help identifying the best fit for your application.
Optional Accessories
MODELS EB-L & EB-J ANALOG TEST SETS
- INFO
- STATS
- Compatible Sensor Models: 1521 I 1522 I 1525 I 1527 I 1531
- Socket Types: JLCC or LCC
-
Includes:
- Test board
- ZIF socket
- 10-pin ribbon cable
- jumpers
- Use with: SDI 3340 G-Logger DAQ
Looking for Broader Range or Standard Temp Applications?
SDI 1521 SURFACE MOUNT ACCELEROMETERS
- INFO
- STATS
- APPLICATIONS
- Power: +5 VDC
-
Output:
- Differential: +/- 4 V
- Single Ended: +0.5V to +4.5V
- Current: 5 mA
- Mass: LCC: 0.62 grams
-
Package:
- J-Lead 20 Pin LCC
- Material: Gold & Ceramic
- Size: 9mm x 9mm x 5mm
- Temperature: -55 to +125°C
- Elevator monitoring
- Platform leveling
- Flight test systems
- Hostile environment R&D
- Calibrating other accelerometers
MODEL 1531 HIGH-TEMPERATURE TO +175°C
- INFO
- STATS
- APPLICATIONS
- Power: +5 VDC
-
Output:
- Differential: +/- 4 V
- Single Ended: +0.5V to +4.5V
- Current: 5 mA
- Mass: J-LCC: 0.68 grams
-
Package:
- J-Lead 20 Pin LCC
- Material: Gold & Ceramic
- Size: 9mm x 9mm x 5mm
- Temperature: -55 to +175°C
- Drillstring vibration monitoring
- Wellbore surveying
- Directional navigation
- Formation measurement
- Downhole equipment shock information
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