MODEL 1527 TACTICAL-GRADE INERTIAL
MEMS SURFACE MOUNT ACCELEROMETERECCN 7A994••••••••••

Small Bias and SF Temperature Coefficients
Excellent In-Run Bias Stability
Zero Cross Coupling by Design
Low Power +5 VDC, 6.5 mA-55 to +125°C Operation±4V Differential Analog Output
Internal Temperature Sensor
Nitrogen Damped & Hermetically Sealed
Small J-Lead LCC-20 Ceramic Package, Mass 0.68 g
Serialized for Traceability & RoHS Compliant

AVAILABLE G-RANGESFULL SCALE
ACCELERATION± 10 g± 25 g± 50 g20 PINJ-LCC
1527J-010
1527J-025
1527J-050

DESCRIPTION
0.350""J" SUFFIXPACKAGE

0.350"The Model 1527 is a small, lightweight, integrated MEMS accelerometer for
use in tactical-grade inertial applications requiring high repeatability, low
A 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.

Positive
Acceleration

0.165"

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. Each device is marked with aserial number on its top and bottom surfaces for traceability. Documentation is supplied with each unit
showing the residuals, thermal sensor model, acceleroation model, bias, scale factor, linearity, operating
current, & frequency response.

ZERO (DC) TO MEDIUM FREQUENCY APPLICATIONSDESIGN SPECIFICATIONSPARAMETER
Vibration Rectification, typicalRandom, 10-50 Hz
Random, 50-200 Hz
Velocity Random WalkBias, Long Term Repeatability (1σ)
In Run Bias Stability at +1g, 2-40,000 sec. (AV Min)
Scale Factor Long Term Repeatability (1σ)
Output White Noise
Temperature Sensor Sensitivity (IT Pin 7)
Temperature Sensor Noise
Turn-On Time < 150 ppm of FS
Operating Voltage
Input Axis Misalignment
Peak Vibration (Operating and Non-operating

TYPICAL
VALUE/RANGE+/-10GTYPICAL
VALUE/RANGE+/-25GTYPICAL
VALUE/RANGE+/-50G

UNITS

TBA

30100
0.012
1.50
30300
25
1.2 to 1.8
0.33 RMS typ
0.5
4.75 to 5.25
4200%TBAµg/g2 rms

0.025
3.06030050
1.2 to 1.80.33 RMS typ
0.5
4.75 to 5.25
4200%m/s√Hr½mgµg
PPMµg/√Hz½ rms
uA/CCmsec
Volts
mrad
FS

0.007
1.25
12300
18
1.2 to 1.80.33 RMS typ
0.5
4.75 to 5.25
4200%

Design specifications are inherent in the design and not tested during manufacturing
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 of 6]15-July-2020

MODEL 1527 TACTICAL INERTIAL ACCELEROMETERTESTED PERFORMANCE SPECIFICATIONSPARAMETERBias

LIMIT +/-10G+/- 0.5

LIMIT +/-25G+/- 0.5

LIMIT +/-50G+/- 0.5

Bias Temperature Coefficient±25±15±15

Scale Factor Sensitivity, +/-0.5%
Scale Factor Temperature CoefficientFrequency Response, DC to -3 dB, Minimum*
RMS Model Residual (+/- 1g, -40, +25, +85ͼC)

400±25420
30160±25660
2580±251050
25UNITS% of FS
PPM ofFS/ͼCmV/g
PPM/ ͼC
HzPPM of FS*Frequency Response reported as performance once soldered. Simulating Frequency Response with the DV pin
will report lower values than actual performance once soldered.

MAX OPERATING LIMITSPARAMETER
Differential Output
Operating Voltage
Quiescent Operating Current at +5V
Operating / Storage Temperature
Applied Voltage on Digital Pins
Mechanical Shock (0.1 ms)
Peak Vibration (Operating and Non-operating)

MINIMUM
MAXIMUM
UNITS+4.0-4.0
Volts
5.25
4.75
Volts
6.5---mA+125-55
ͼC
5.5-0.5Volts
5,000---g-peak200---% of FS
FS = Full Scale = 4V absolute differential output = 4000 mVNOTICE: Stresses greater than those listed above may cause permanent damage to the device. These aremaximum stress ratings only. Functional operation of the device at or above these conditions is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability and lifespan.

OPERATION
The model 1527 sensitive axis is perpendicular to thebottom of the package, with positive acceleration
resulting from a positive force pushing on the bottom ofthe package. The seismic center is located on acenterline 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 asshown in figure 1. The seismic center is located on acenterline through the dual sense elements halfway
between them. Any errors due to rotation about thispoint 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 atzero acceleration are nominally 80 mV below the +2.5volt input.

The 1527 should not be used inSingle Ended mode

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 of 6]15-July-2020

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MODEL 1527 TACTICAL INERTIAL ACCELEROMETERSAMPLE OF INCLUDED TEST REPORT
Every 1527 accelerometer is accompanied by a test report featuring the measured bias, scale factor, linearity,output, and frequency and phase response.

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 3 of 6]15-July-2020

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MODEL 1527 TACTICAL INERTIAL ACCELEROMETERSIGNAL DESCRIPTIONSVDD and GND (power): Pins (14) and (19) respectively. Power (+5 Volts DC) and ground.
AOP and AON (output): Pins 12 and 16 respectively. Analog output voltages proportional to acceleration. The AOPvoltage increases (AON decreases) with positive acceleration; at zero acceleration both outputs are nominally equal
to the +2.5 volt reference. The device experiences positive (+1g) acceleration with its lid facing up in the earth’s
gravitational field. Use of differential mode is required for both low noise and high accuracy operation. Voltages
can be measured ratio-metrically to VR for good repeatability without requiring a separate precision reference
voltage for an A/D.
DV (input): Pin 4. Deflection Voltage. Connect to the 2.5 Volt pin for best repeatability. A test input that applies anelectrostatic force to the sense element, simulating a positive acceleration. The nominal voltage at this pin is ½VDD. DV voltages higher than required to bring the output to positive full scale may cause device damage to 2g, 5g,and 10g devices. See app note.
VR (input and Ref GND): Pin 3. Voltage Reference. Tie VR to a good reference (not directly to VDD) for best scale



'9 

IT (output): Pin 7. Uncalibrated temperature dependent current source.

JQG

Tie to VDD if not used.

JQG $217239,(:,7  9''


$23



YGG&/.,1 Special Use Pins: Pins 9 and 11 should be tied to VDD; Pins 2,5,6 and 18 toGND; Pins 1,7,10,13, and 15 are reserved and should remain unused.
Contact SDI for possible special use of these pins.

JQG

 91527

YGG

CLKIN: Pin 8. Optional external clock input, leave unconnected or contact
SDI for details on this feature.

*1'JQG

resistive voltage divider from +5 volts. A 0.1μF bypass capacitor isrecommended at this pin. VR current is less than 50 μA.

5HI*1'2.5 Volt (input): Pin 17. Sets output common-mode value. Tie to a95

factor repeatability. A 0.1μF bypass capacitor is recommended at this pin. VR current is less than 100 μA. Ref GND
can be connected to pin 19. However, to minimize 1/f noise, connect pin 20 separately to the ground of the voltage
reference ground pin.

INTERNAL CLOCK
The model 1527 contains an internal clock than runs at approximately 900 KHz. The internal clock is powered byVDD. Like other synchronous sensors, it is subject to clock “lock-in” with other accelerometers driven by the same
VDD. To avoid possible lock-in and small bias jumps, it is recommended that the VDD power to each accelerometerbe supplied by separately buffered sources or filtered from a common well bypassed source by a LC filter with aminimum of 20 dB loss at 800 KHz. Alternatively, multiple accelerometers can be driven by the same external clockwith a frequency in the range of 0.5 to 1 MHz. Contact SDI for more information on using an external clock.
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 of 6]15-July-2020



MODEL 1527 TACTICAL INERTIAL ACCELEROMETERRECOMMENDED CONNECTIONSDEFLECTION VOLTAGE (DV) TESTINPUT: This test input applies anelectrostatic force to the sense
element, simulating a positive
acceleration of up to +10g. It has anominal input impedance of 32 kΩ
and a nominal open circuit voltage of½ VDD. For best accuracy during
normal operation, this input shouldbe left unconnected or connected toa voltage source equal to ½ of the VDD
supply.

5K
8

CLOCK INPUT

4TEST INPUT(OPTIONAL)

17+ 5V
REF+ 5V
Power

3VR
CLKIN

14VDD

111527

AON2.5V

2GND
519

Ref
GND
620) ≈ k §¨ V DV − 1 V DD ·¸
2

©

IT
18

12

OUTPUT (POSITIVE)

16

OUTPUT (NEGATIVE)

7
RT2K

TEMPERATURE
VOLTAGE OUT(Optional)(See Text)

The change in differential output voltage (AOP - AON) is proportional to the square of the difference between thevoltage applied to the DV input (VDV) and ½ VDD. Only positive shifts in the output voltage may be generated by applying
voltage to the DV input. When voltage is applied to the DV input on 2g, 5g, and 10g devices, it should be applied
gradually. The application of DV voltages greater than required to bring the output to positive full scale may cause
device damage. The proportionality constant (k) varies for each device and is not trimmed to a value.
ESD and LATCH-UP CONSIDERATIONS: The model 1527 accelerometer is a CMOS device subject to damage fromlarge electrostatic discharges. Diode protection is provided on the inputs and outputs, and it is not easily damaged,
but care should be exercised during handling. However, individuals and tools should be grounded before comingin contact with the device. Although the 1527 is resistant to latch-up, inserting a 1527 into or removing it from a
powered socket may cause damage.

INTERNAL TEMPERATURE SENSING
The model 1527 accelerometer outputs a temperaturedependent current source on pin 8. This signal is useful formeasuring the internal temperature of the accelerometerso that any previously characterized bias and scale factor
temperature dependence, for a particular accelerometer,
can be corrected. The nominal output current at 25°C is≈500 (±200) μA and the nominal sensitivity is 1.5 (±0.5) μA/°C.
With a single resistor RT = 2K between IT (pin 8) and GND theoutput voltage VT will vary between +0.76 and +1.3 volts from-55 to +125°C, which equates to a sensitivity of ≈+3 mV/°C.
Temperature Sensor
White Noise (1-1000 Hz):MINTYPMAXUNITS

0.250.25

0.25°C rmsVT ≈ RT [(500 μA) + [(1.5μA)(T − 25)]] ROFF =ΔVT
= RT (1.5μA) ΔT− VOFF§VT· + (500 μA) + [(1.5 μA)(T − 25)]
¨ R ¸G¹©

ªVºVT ≈ − RG « OFF + (500μA) + [(1.5μA)(T − 25)]» R¬ OFF¼ΔV− ΔVT= − RG (1.5μA)  RG =ΔT(1.5μA)(ΔT )If a greater voltage change versus temperature or lower
signal source impedance is needed, add the amplifier asshown on the right side in Figure 2. With offset voltage VOFF= -5V, gain resistor RG = 15.0K and offset resistor ROFF =7.32K, the output voltage VT will vary between +4.5 and +0.5
Volts from -55 to +125°C, which equates to a sensitivity of ≈-29 mV/°C. Figure 3 shows the voltage compliance of thetemperature dependent current source (IT) at room
temperature. The voltage at pin 8 must be kept in the 0 to+3V range in order to achieve proper temperature readings.

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 5 of 6]¹0.1 uF

9AOPDV

5K

0.01uF

Δ ( AOP − AON

15-July-2020

2





MODEL 1527 TACTICAL INERTIAL ACCELEROMETERSOLDERING RECOMMENDATIONSRoHS Compliance: The model 1527 does not contain elemental
lead and is RoHS compliant.

DIM
A
B
C
DE
F
GF

GF
E

Pre-Tinning of Accelerometer Leads is Recommended: To
prevent gold migration embrittlement of the solder joints, it isbest to pre-tin the accelerometer leads.

AC
DSoldering: Solder reflow should not exceed 239°C, exceeding
this temperature may result in permanent damage.

Inch.230.430.100.033.050.013.120mm
5.84
10.92
2.54
0.84
1.27
0.33
3.05

B

J-LCC Solder Contact Plating Information: The plating composition and thickness for the solder pads andcastellations on the J-Lead package top layer are 100 to 225 micro inches thick of 99.7% gold (Au) over 80 to 350
micro inches thick of electroplated nickel (Ni).
These dimensions are recommendations only and may or may not be optimal for your soldering process.

Do not use ultrasonic cleaners.
Ultrasonic cleaning voids the warranty and may break internal wire bonds.

PACKAGE DIMENSIONS
1.
2.
3.
4.

5.

*Dimensions “M,” “T,” and “U” locate sensing element’s center of mass.
Lid is electrically tied to terminal 19 (GND).
Controlling dimension: Inch.
Terminals are plated with 60 micro inches min gold over 80 micro
DimAinches min nickel. This plating specification does not apply to the PinB
1 identifier mark on the bottom of the J-lead package version.
DPackage: 90% min alumina (black), lid: solder sealed Kovar.
*T

R

FK*UNPB

A

TERMINAL 20

PositiveAccelerationA

TERMINAL 1FK*M
NPR*T*UInches
Min
Max
0.342
0.358
0.346
0.378
0.095
0.115
0.050 BSC
0.010 R TYP
0.066 TYP
0.050
0.070
0.017 TYP
0.023 R TYP
0.085 TYP
0.175 TYP

Millimeters
MinMax
8.69
9.09
8.79
9.60
2.41
2.92
1.27 BSC
0.25 R TYP
1.68 TYP
1.27
1.78
0.43 TYP
0.58 R TYP
2.16 TYP
4.45 TYP

Mass 0.68 g*M
D

COMPANION ACCESSORYThe SDI Model 2227 Q-Module combines a high-temperature, open printed
circuit board (PCB) specifically designed to give the high stability required forinertial applications and SDI’s Model 1527 Tactical-Grade Inertial Navigation
MEMS Accelerometer. It is a low-mass, low-power module, electrically andmechanically compatible with fixtures and equipment designed for industrystandard quartz accelerometers and intended for use in inertial and tilt
applications requiring zero to medium frequency response excellent longterm bias and scale factor repeatability, and low noise.

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 of 6]15-July-2020