HIGH-PERFORMANCE MODELS 2470 AND 2476
PREMIUM 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 Across Three Orthogonal Axes
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
Eight (8) Wire Connection, Choice of Integrated Cable or Connector
Rugged Anodized Aluminum Case
Fully Calibrated and Serialized for Traceability•AVAILABLE G-RANGESFULL SCALE
ACCELERATIONMODELSUFFIX±2g±5g± 10 g± 25 g± 50 g± 100 g± 200 g± 400 g-002-005-010
-025
-050
-100-200-400

PREMIUM HIGH-PERFORMANCE ACCELEROMETER MODELS 2470 AND 2476
SDI’s Premium Models 2470 and 2476 High-Performance Three-Axis
MEMS DC Accelerometers are rugged plug-and-play measurement
devices suitable for a wide array of demanding applications. Bothmodels provide enhanced performance over temperature for use inzero to medium frequency applications experiencing large or rapid
temperature variations or maintaining hot or cold extremes forextended periods of time.
The 2470 comes in a traditional 1-inch square package with an integrated cable and is operationally identical to the2476, which features a connector instead of integrated cable for quick installations and removal without altering thecabling. The 2470 and 2476 incorporate three orthogonally mounted, hermetically sealed, low noise SDI Model 1522
surface mount accelerometers, which are individually tested, programmed, calibrated and verified in a climate chamber
to ensure the greatest accuracy in thermally volatile conditions. The 2470 and 2476 include initial calibration reports
detailing the test performance data.
Onboard voltage regulation and an internal voltage reference eliminate the need for precision power supplies. The
robust, anodized aluminum case is potted then epoxy sealed and can be mounted easily via two screws, an adhesive,
or by attaching a magnet. Individual axis directions are marked on the case with positive acceleration defined as
acceleration in the direction of the axis arrow.

ZERO (DC) TO MEDIUM FREQUENCY APPLICATIONSPERFORMANCE BY G RANGEINPUTRANGEgSENSITIVITY,DIFFERENTIAL
mV/g*FREQUENCYRESPONSE(TYPICAL, 5%)
Hz*FREQUENCYRESPONSE(TYPICAL, 3 DB)
Hz*FREQUENCYRESPONSE(MINIMUM, 3 DB)Hz

OUTPUT NOISE,DIFFERENTIAL(RMS, TYPICAL)
μg/(root Hz)±220000 – 250

0 – 525

0 – 300

10±5800
0 – 400±104000 – 700±251600 – 1300
±50800 – 1600
±100
400 – 1700
±200200 – 1900
±400
100 – 2000
By Model: VDD=VR=5.0 VDC, TC=25°C0 – 8000 – 1100
0 – 1750
0 – 2100
0 – 30000 – 3600
0 – 4200

0 – 420
0 – 660
0 – 1050
0 – 1400
0 – 1700
0 – 2100
0 – 2400

15233860
121243475

MAX.
MECHANICALSHOCK (0.1 MS)
g (peak)
2000

5000

Single ended sensitivity is half of values shown.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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www.silicondesigns.com[page 1]

15-July-2020

HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERSPERFORMANCE - ALL VERSIONSAll Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.

PARAMETER
Bias Calibration Error (%)
Bias Calibration Error (mV)
Scale Factor Calibration Error 1
Non-Linearity (-90 to +90% of span) 1
Bias Temperature Shift (Coefficient)
Scale Factor Temperature Shift (Coefficient)
Cross Axis Sensitivity
Power Supply Rejection Ratio
Output Impedance
Output Common Mode Voltage
Operating Voltage
Operating Current (AOP & AON open)
Operating Temperature
Mass (not including cable)
Cable Mass (3’ integrated cable)

MIN-100-15050819-55

TYP0.25250.50.15002>65
12.523MAX0.660
1.250.5+100+5033227+1252125UNITS± % of span
± mV±%± % of span
(PPM of span)/°C
PPM/°C±%
dBΩ
VDC
VDC
mA DC°Cgrams
grams/meter

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 Model 2460 or 2466 triaxial accelerometer modules.
For applications experiencing larger temperature variations (i.e. exposure to engine temperatures or arctic testing)
SDI suggests the upgraded High-Performance 2470, 2476, and 2480 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 analog
accelerometers, 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 +/-200
Temperature PPM of span per °C rating and a 55 °C rise from room temperature would be: +/-200 / 1,000,000 xShift(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.
BiasSPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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[page 2]15-July-2020

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERSOPERATION
SDI’s Universal Triaxial MEMS DC Accelerometers provide optimal performance when they are connected toinstrumentation in a differential configuration using both the AOP and AON output signals, but still support single
ended operation for complete flexibility.
These Accelerometers produce three differential analog output voltage pairs (AON & AOP) which vary withacceleration. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. Atzero acceleration, 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 voltageof +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
2470: The SDI 2470 has an integrated 3’ cable with strain relief attached at the connection to the case and consistsof seven 28 AWG (7x36) and one 26 AWG (7x34) tin-plated copper wires. The seven smaller 28 AWG wires are coveredby 5.5 mils of Teflon FEP insulation. The large single 26 AWG wire is covered by 8.5 mils of black Teflon FEP
insulation. The seven smaller gauge wires surround the single larger gauge (black) wire. The cable’s braided
shield is electrically connected to the case. The black ground (GND) wire is isolated from the case. The wire bundle
is surrounded by a braided shield and covered by a 10 mil thick Teflon FEP jacket with a nominal outer diameter of0.136”.
2476: The SDI 2476 has a 9-pin connector; the cable consists of eight 26 AWG tin-plated copper wires and only eightpins are used for the 8-wire cable. All eight of the 26 AWG wires are covered by 8.5 mils of Teflon insulation.
Both cable styles end in an 8-wire pigtail.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS

RECOMMENDED CONNECTIONS - DIFFERENTIAL
SDI Models 2470 and 2476 Accelerometers provide optimal performance when they are connected toinstrumentation in a differential configuration using both the AOP and AON output signals.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS

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

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS

2476 CABLE LENGTHS

The 8PIN-CAB is available in five standard lengths, and custom lengths may be available for special order.
NAME
8PIN-CAB-04
8PIN-CAB-10
8PIN-CAB-20
8PIN-CAB-33
8PIN-CAB-50

LENGTH - FEET
4 Feet10 Feet20 Feet33 Feet50 FeetLENGTH - METERS (APPROXIMATE)
1.2 Meters
3 Meters
6 Meters
10 Meters
15.4 Meters

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, Silicon Designs recommends checking each individual installation for oscillation bytapping the accelerometer and watching the differential output for oscillation in the 20 kHz to 50 kHz region. If nooscillation is present, extended cable length should behave as expected. From the standpoint of output current driveand slew rate limitations, all SDI Universal Accelerometers are capable of driving over 2000 feet (600 meters) ofcable. However, at some length ranging between 50 feet and 2000 feet, each device will likely begin to exhibit
oscillation.

ALTERNATIVE MODELS
SDI’s High-Performance Models 2220 and 2276 are the single axis versions of the 2470 and 2476 andcome in two sizes to complement the triaxial configurations. With similarly upgraded SDI
accelerometer chips, they provide improved bias and scale factor temperature shift performance, andinclude an initial calibration certificate.
The 2220 comes in a traditional 1-inch square package with an
integrated cable. It is operationally identical to the 2276, the small
footprint accelerometer designed for tight spaces. 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

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS

2470 DIMENSIONS

2476 DIMENSIONS>@>@>@',$

2476-XXX
YX>@XXXX

>@6,/,&21' ( 6 , * 16Z.(<$21=*1'
96$23;$23=$21<$21;
$23<>@>@>@>@9'&X>@6(5,$/>@Inch [mm] ;

 =

9'&2476-XXX
XXXXX

 ;<Z =

 ;<6,/,&21'(6 ,* 16YXYZXX <Z =

 ;
 <All measurements are in inches

Data sheets dated 1-November-2015 and newer apply to 2470 and 2476 serial numbers above 2000.
Contact SDI for data sheets pertaining to prior parts with serial numbers below 2000.


SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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www.silicondesigns.com

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERSCALIBRATION REPORT EXAMPLESLINEARITY, PHASE & FREQUENCY RESPONSE BY G-LEVELThe optional 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.

EXAMPLE 2G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 5G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 10G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 25G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 50G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 100G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 200G

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HIGH-PERFORMANCE 2470 AND 2476 TRIAXIAL ACCELEROMETERS



EXAMPLE 400G

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[page 15]

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