SDI 1527 TACTICAL-GRADE INERTIAL  SURFACE MOUNT ACCELEROMETERS

ECCN 7A994

SDI 1527 inertial accelerometers
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Featuring an average bias repeatability better than 2 mg, the 1527 is SDI’s tactical-grade inertial measurement accelerometer. Years of exhaustive R&D have generated an exceptional MEMS accelerometer with superb Allan Variance, long term bias repeatability, scale factor stability, axis misalignment and vibration rectification error.

The Model 1527 was designed for tactical-grade inertial applications requiring high repeatability, low noise, and long-term stability in -55 to +125°C environments. The Model 1527 accelerometers are fully designed and built by SDI in the USA, and each unit is individually tested, calibrated and verified for performance.  

AVAILABLE

G-RANGES

± 10 g

± 25 g

± 50 g

  • Excellent In-Run Bias Stability

  • Zero Cross Coupling by Design

  • Allan Variance from 5 μg

  • -55 to +125°C Operation

  • ±4V Differential Output

  • +5 VDC, 6.5 mA Power (Typical)

  • Internal Temperature Sensor

  • Nitrogen Damped & Hermetically Sealed

  • Serialized for Traceability

  • 9 mm sq. J-Lead LCC-20 Package

  • Low Mass: 0.68 grams

Quick Links

Each miniature, hermetically sealed package combines a MEMS capacitive sense element and a custom integrated circuit that includes a sense amplifier and differential output stage.  It is relatively insensitive to temperature changes and gradients.  Each device is individually tested, programmed, calibrated by SDI, as well as marked with a serial number on its top and bottom surfaces for traceability.  A calibration test report (1527-TST) is provided with every unit showing the measured bias, scale factor, linearity, operating current, & frequency response.

ZERO TO MEDIUM FREQUENCY APPLICATIONS

SDI accelerometer applications

OPERATION

The model 1527 sensitive axis is perpendicular to the bottom of the package, with positive acceleration resulting from a positive force pushing on the bottom of the package. The seismic center is located on a centerline through the dual sense elements and halfway between them.  


The Model 1527 produces a differential +/-4 volts output voltage, the value of which varies with acceleration as shown in figure 1. 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 80 mV below the +2.5 volt input. 

SDI accelerometer differential output signal plot

DESIGN SPECIFICATIONS

Unless otherwise specified VDD=VR=5.0 VDC, TC=25°C, Differential Output, J-lead package 

TESTED PERFORMANCE SPECIFICATIONS

Scale = measured value; FS = Full Scale = absolute output = 4000 mV

MAX OPERATING LIMITS

NOTICE:  Stresses greater than those listed 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.

PACKAGE DIMENSIONS

J Package drawing

Please see the data sheet for sensor location and other additional details.