SPECIALTY HERMETIC MODELS 2240 & 2480
PREMIUM 1-AXIS & 3-AXIS DC ACCELEROMETERS•••••••••••

Low Noise: 10 μg√ Hz Typical for ±2g Full Scale Versions-55 to +125°C Operating Temperature Range
Acceleration and Vibration Sensing
Excellent Long-Term Stability
Flexible +8 to +32 VDC Power±4V Differential Output or 0.5V to 4.5V Single Ended Output
Responds to frequencies from zero (DC) to 2000+ Hz
Low Impedance Outputs Support up to 2000 Feet of Cable
Simple Four (4) or Eight (8) Wire Connection
Rugged, Hermetic Titanium Case Capable of IP67
Fully Calibrated and Serialized for Traceability

AVAILABLE G-RANGESFULL SCALE
ACCELERATION±2g±5g± 10 g± 25 g± 50 g± 100 g± 200 g± 400 g

MODELSUFFIX-002-005-010-025-050-100-200-400

PREMIUM HERMETIC ACCELEROMETER MODELS 2240 AND 2480
Models 2240 and 2480 Specialty Hermetic MEMS Variable Capacitive
DC Accelerometers from Silicon Designs (SDI) are low-cost,
integrated plug-and-play measurement devices suitable for a widearray of demanding applications. Both models provide enhancedperformance over temperature in zero to medium frequency
applications experiencing large or rapid temperature variations ormaintaining hot or cold extremes for extended periods of time.
The SDI Models 2240 and 2480 contain a single or three orthogonally mounted, Premium accelerometer LCCs,
making them even less sensitive to temperature changes and gradients from -55 to +125°C and greatly reducing
bias and scale factor temperature shifts for premium performance. Their enhanced, temperature compensated,
proprietary SDI Model 1522 accelerometer LCC chips are individually tested, calibrated and verified in a climatechamber. Both the 2240 and 2480 come with an initial calibration report featuring additional information about thelinearity, output, phase, and frequency response as tested for each unit.
SDI 2240 and 2480 accelerometers are packaged in rugged, hermetically-sealed, titanium cases, and connectors
allow for customized cable lengths and easy repositioning. Onboard voltage regulation and an internal voltage
reference eliminate the need for precision power supplies. The cases are rated IP 67; the connector is rated IP 61
and can meet IP 67 when sealed with a boot, sleeve, or heat shrink. The case is easily mounted via two screws,adhesive, or by attaching a magnet.

ZERO (DC) TO MEDIUM FREQUENCY APPLICATIONSPERFORMANCE BY G RANGE
INPUT
RANGE

SENSITIVITY,DIFFERENTIALFREQUENCYRESPONSE(TYPICAL, 5%)

FREQUENCYRESPONSE(TYPICAL, 3 DB)

FREQUENCYRESPONSE(MINIMUM, 3 DB)

OUTPUT NOISE,DIFFERENTIAL(RMS, TYPICAL)MAX.
MECHANICALSHOCK (0.1 MS)

g±2mV/g
2000

Hz
0 – 250

Hz
0 – 525

Hz
0 – 300μg/(root Hz)
10g (peak)±5±10±25±50±100±200±400800
400160804020100 – 400
0 – 700
0 – 1300
0 – 1600
0 – 1700
0 – 1900
0 – 2000

0 – 800
0 – 1100
0 – 1750
0 – 2100
0 – 30000 – 3600
0 – 4200

0 – 420
0 – 660
0 – 1050
0 – 1400
0 – 1700
0 – 2100
0 – 240015233860121243475

By Version: VDD=VR=5.0 VDC, TC=25°C

2000

5000

Single ended sensitivity is half of values shown.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 1]

15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERSPERFORMANCE - ALL VERSIONSAll Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.
PARAMETERMINTYPMAXUNITS
Bias Calibration Error (%)
0.25
0.6± % of span
Bias Calibration Error (mV)
2560± mV
Scale Factor Calibration Error 1
0.5
1.25
±%
Non-Linearity (-90 to +90% of span) 10.15
0.5± % of span
Bias Temperature Shift (Coefficient)-1000+100(PPM of span)/°C
Scale Factor Temperature Shift (Coefficient)-150
0+50PPM/°C
Cross Axis Sensitivity
23±%
Power Supply Rejection Ratio
50>65dB
Output Impedance
1ΩOutput Common Mode Voltage
2.5
VDC
Operating Voltage
832
VDC
Operating Current (AOP & AON open, 2240/2480)
6/19
7/23
12/27
mA DC
Mass 2240 / 2480
15 / 25grams
Operating Temperature-55+125°C
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.

BIAS & SCALE FACTOR TEMPERATURE SHIFT EXPLAINEDEvery accelerometer has a bias and scale factor temperature coefficient, meaning the output shifts slightly due totemperature changes. Many applications operate within a relatively small temperature band or at room
temperature, and therefore rarely encounter interference from the bias or scale factor temperature shifts. Thesecustomers are ideal candidates for SDI’s Low-Cost accelerometer modules.
For applications experiencing larger temperature variations (i.e. exposure to engine temperatures or arctic testing)
SDI suggests the upgraded Premium accelerometer modules. These have enhanced, temperature compensated,
proprietary SDI Model 1522 accelerometer chips, which are individually tested, calibrated and verified in a climate
chamber to provide the most accuracy and come with an initial calibration certificate.
The accelerometer output with no acceleration present. For SDI’s differential output analogaccelerometers, it is a signed quantity that is expressed in terms of either g or output volts and isideally equal to zero g or zero volts.
The ratio of the change in output to a unit change in the input acceleration expressed in millivolts perg (mV/g). Since the output of most accelerometers is slightly non-linear, the scale factor value is
Scale Factor
defined as the slope of the least-squares-fit line to the acceleration input vs output curve. SDI
measures over the range of -90% to +90% of full scale or from -65g to +65g, whichever is smaller.
The amount of bias shift to expect with a change in temperature expressed as PPM of span per °C.
BiasFor example, the percent of span bias shift that would occur for a 25g full scale device with a +/-200Temperature PPM of span per °C rating and a 55 °C rise from room temperature would be: +/-200 / 1,000,000 x
Shift(80C - 25C) x 100% of span = +/-1.1% of span. The g shift would be +/-1.1% of 50g = 0.55 g. This error(Coefficient) in terms of output voltage for a 25 g analog accelerometer would be +/-1.1% of span = +/-1.1% of 8 V= 88 mV.
The amount of scale factor shift to expect with a change in temperature expressed as PPM per °C.
Scale Factor
For example, the percent shift in scale factor that would occur for a device with a +200 PPM per °C
Temperature
rating and a 60 °C rise from room temperature would be: +200 / 1,000,000 x (85C - 25C) x 100% =Shift+1.2%. For an analog 10g device, the scale factor would rise from its nominal (8 V)/(20 g) = 400 mV/g(Coefficient)
at +25C to 400 mV/g +1.2% = 404.8 mV/g.

Bias
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 2]15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERSOPERATION
SDI Models 2240 and 2480 MEMS Specialty Hermetic Variable Capacitive Accelerometers provide optimal
performance when they are connected to instrumentation in a differential configuration using both the AOP andAON output signals, but they also support single ended operation for complete flexibility.
These accelerometers produce differential analog output voltage pairs (AON & AOP) which vary with acceleration.
The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. At zeroacceleration, the output differential voltage is nominally 0 volts DC; at ±full scale acceleration, the output is ±4 volts
DC, respectively, as shown in the figure (below). The output scale factor is independent from the supply voltage of+8 to +32 volts.
When a differential connection is not possible, SDI recommends connecting the accelerometer to instrumentationin single ended mode by connecting AOP and GND to the instrumentation and leaving AON disconnected. Keep inmind that the signal to noise ratio is reduced by half for a single-ended vs. a differential connection.

CABLE SPECIFICATIONS

2240: The connector shells, pins and sockets are gold plated brass. The 4PIN-CAB cable consists of four 30 AWG(7x38) silver-plated copper wires with PTFE insulation surrounded by a braided shield. The black FEP shieldjacket has a nominal outer diameter of 0.100”.
2480: The SDI Model 2480 has a 9-pin connector and only eight pins are used for the 8-wire cable; the 8PIN-CAB
cable consists of eight 26 AWG tin-plated copper wires. All eight of the 26 AWG wires are covered by 8.5 mils ofTeflon insulation.
Cables are available in five standard lengths, and custom lengths may be available for special order.
1-AIXS CABLE
4PIN-CAB-04
4PIN-CAB-10
4PIN-CAB-20
4PIN-CAB-33
4PIN-CAB-50

3-AIXS CABLE
8PIN-CAB-04
8PIN-CAB-10
8PIN-CAB-20
8PIN-CAB-33
8PIN-CAB-50

LENGTH - FEET4 Feet
10 Feet20 Feet33 Feet50 FeetLENGTH - METERS (APPROXIMATE)
1.2 Meters
3 Meters
6 Meters
10 Meters
15.4 Meters

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
CABLE LENGTH CONSIDERATIONS
Cable lengths of up to 50 feet (15 meters) can be used without the need to test for output instability. For cable
lengths exceeding 50 feet, SDI recommends checking each individual installation for oscillation by tapping theaccelerometer and watching the differential output for oscillation in the 20 kHz to 50 kHz region. If no oscillation ispresent, extended cable length should behave as expected. From the standpoint of output current drive and slew
rate limitations, all SDI Universal Accelerometers are capable of driving over 2000 feet (600 meters) of cable.
However, at some length ranging between 50 feet and 2000 feet, each device will likely begin to exhibit oscillation.

RECOMMENDED CONNECTIONS - DIFFERENTIAL
SDI Models 2240 and 2480 MEMS Specialty Hermetic Variable Capacitive Accelerometers provide optimal
performance when they are connected to instrumentation in a differential configuration using both the AOP andAON output signals

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 4]15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICESilicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 5]15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS

RECOMMENDED CONNECTIONS – SINGLE ENDED
Single ended operation is also possible with minor changes to the wiring configuration, as described below.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 6]15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS

PACKAGE DIMENSIONS
1.00 [25.4]
0.825 [20.95]

0.31 [7.9]9'&6,/,&21'(6,*161/4-28, 3,1&211(&7252480-XXX

2240-XXX
S/N XXXX$23=$21<$21;
$23<Y

PINOUTX

 =

0.22 [5.6]0.33 [8.4]

*1'

$23

XXXX

 ;<0.44 [11.2]
0.127[3.23] DIA ;

 =

0.50 [12.7]

XZZ

ZX

 ;$21Vs

INCH [mm](ACTUAL SIZE)= Location of Sense Element < <>@>@

>@',$6(5,$/

6,/,&21'(6,*16>@>@>@>@9'&2480-XXX
X Y
>@XXXXXZ>@Inch [mm]>@PositiveAcceleration
0.15 [3.8]

*1'
96
$23;

 ;<1.00 [25.4]

X Y =SILICONDESIGNS.(<$21=All measurements are in inches

Contact SDI for data sheets pertaining to 2240s with serial numbers below 3000 and 2480s with serial numbers
below 195.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
COMPARABLE MODELSSDI also produces non-hermetic accelerometer models with identical internal components in cost-effective
anodized aluminum cases. Within these, customers can choose between an integrated 3’ cable or an identicalconnector to those on the 2240 and 2480, allowing for interchagable cables.
Hermetic Model

Alternative Model2220
22402480••••

Internally identical to 2240
Anodized aluminum case
LxWxH Dimensions: 1”x1”x 0.3”
Integrated 3’ cable with strain relief•

Same performance to 2240 in smaller
package
Anodized aluminum case
LxWxH Dimensions: 1”x 0.63”x 0.425”
Same connector as 2240 for
interchangeable cables

•
•
•

2276

Hermetic Model

Characteristics

Alternative Model

Characteristics

2470

2476

•
•
•
•

Internally identical to 2480
Anodized aluminum case
LxWxH Dimensions: 1”x1”x 0.825”
Integrated 3’ cable with strain relief••••

Internally identical to 2480
Anodized aluminum case
LxWxH Dimensions: 1”x 1”x 0.825”
Same connector as 2480 for
interchangeable cables

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com[page 8]15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERSCALIBRATION REPORT EXAMPLESLINEARITY, PHASE & FREQUENCY RESPONSE BY G-LEVEL
The included calibration reports provide additional information about the linearity, output, phase, and frequency
response as tested for each individual unit. The following are examples of the graphical data supplied on calibration
reports, by G-level for the SDI Model 2480 Premium 3-axis accelerometer. The Single-Axis Model 2240’s reports
are similar but only display one (1) channel in the charts.

EXAMPLE 2G in 3-AXIS

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 5G in 3-AXIS

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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 10G in 3-AXIS

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Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 25G in 3-AXIS

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Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 50G in 3-AXIS

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Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 100G in 3-AXIS

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Silicon Designs, Inc. • 13905 NE 128th Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
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15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 200G in 3-AXIS

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15-July-2020

PREMIUM MODELS 2240 AND 2480 HERMETIC ACCELEROMETERS
EXAMPLE 400G in 3-AXIS

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15-July-2020