SDI 1521 SURFACE MOUNT ACCELEROMETERS

SDI Model 1521 Accelerometers
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SDI’s Model 1521 Surface Mount MEMS DC Accelerometers are rugged and accurate sensors suitable for a wide array of demanding applications.  Available in both leadless LCC and J-Lead packages, the 1521 excels in zero-to-medium frequency commercial and industrial applications, particularly where reliable performance, extremely low noise, and long-term stability are absolute requirements.

AVAILABLE

G-RANGES

± 2 g

± 5 g

± 10 g

± 25 g

± 50 g

± 100 g

± 200 g

± 400 g

  • Low Noise: 7 μg/rootHz Typical for ±2g Full Scale Versions

  • Responds to frequencies from zero (DC) to 2000+ Hz

  • High Stability and Durability

  • -55 to +125°C Operation

  • ±4V Differential Output

  • +5 VDC, 5 mA Power (Typical)

  • Integrated Sensor & Amplifier

  • Internal Temperature Sensor

  • Nitrogen Damped & Hermetically Sealed

  • Serialized for Traceability

  • RoHS Compliant

Quick Links

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.  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.  An optional calibration test report (1521-TST) is also available for every unit showing the measured bias, scale factor, linearity, operating current, & frequency response.

ZERO TO MEDIUM FREQUENCY APPLICATIONS

Applications for SDI 1521 Accelerometers
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

OPERATION

The Model 1521 produces a differential +/-4 volts output voltage or single ended mode, 0.5 – 4.5 volts full scale, the value of which varies with acceleration as shown in the figures below.  The 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 internal electronics effectively cancel any errors due to rotation. 

 

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 the same as the +2.5 volt input.

operation differential + single ended signals

PERFORMANCE - ALL VERSIONS

All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode.  Span = ±g range = 8000 mV.

Note (1): For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.

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

L Package drawing
J Package drawing

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

OPTIONAL ACCESSORY

Model EB-L and EB-J Analog Test Sets

 

​The Model EB-L and EB-J Analog Test Sets provide a convenient means of testing and evaluating SDI Model 1521 surface mount accelerometers in the LCC or JLCC package formats. 

 

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-L and EB-J Sets and SDI Surface Mount Accelerometers are each sold separately.

EB-J or L Analog Test Board Set