SDI 1525 HIGH-END INERTIAL & INDUSTRIAL
SURFACE MOUNT ACCELEROMETERS
The Model 1525 MEMS DC surface mount inertial accelerometer incorporates Silicon Designs’ own high-performance sense element, along with a ±4.0V differential analog output stage, internal temperature sensor and integral sense amplifier, all within a miniature, nitrogen damped, hermetically sealed, surface mounted J-lead LCC-20 ceramic package. An average bias repeatability specification of 5 mg for the Model 1525 means that it was designed to provide the high level, long-term stability required for intensive inertial applications within -40 to +85°C environments, such as backup systems for light-to-medium weight aircraft and helicopters. The Model 1525 also features low-power operation, excellent in-run bias stability, and zero cross-coupling, yet remains relatively insensitive to temperature changes and gradients.
± 2 g
± 5 g
± 10 g
± 25 g
± 50 g
Excellent In-Run Bias Stability
Zero Cross Coupling by Design
Allan Variance from 5 μg
-40 to +85°C Operation
±4V Differential Output
+5 VDC, 5 mA Power (Typical)
Internal Temperature Sensor
Serialized for Traceability
9 mm sq. J-Lead LCC-20 Package
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 (1525-TST) is provided with every unit showing the measured bias, scale factor, linearity, operating current, & frequency response.
ZERO TO MEDIUM FREQUENCY APPLICATIONS
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)
0 – 350
0 – 250
0 – 200
0 – 450
0 – 300
0 – 250
0 – 600
0 - 400
0 – 500
0 – 900
0 - 600
0 – 650
0 – 1200
0 – 900
0 – 800
The model 1525 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 1525 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 the same as the +2.5 volt input.
PERFORMANCE - BY G-RANGE
Unless otherwise specified VDD=VR=5.0 VDC, TC=25°C, Differential Output, J-lead package
PERFORMANCE - ALL VERSIONS
All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode.
Output Span = ±4V differential output = 8000 mV
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.
Please see the data sheet for sensor location and other additional details.
The Model EB-J Analog Test Set provides a convenient means of testing and evaluating SDI Model 1525 surface mount accelerometers.
The zero-insertion-force socket is pre-fitted to the board, which includes set jumpers for advanced features of SDI accelerometers. A 10-pin connector and ribbon cable provide connections to the user's test equipment.
The EB-J Analog Test Set and SDI Surface Mount Accelerometers are each sold separately.