SDI 1527 TACTICAL-GRADE INERTIAL SURFACE MOUNT ACCELEROMETERS Description：

Datasheet

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.

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

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.

PERFORMANCE - ALL VERSIONS

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

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

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