SILICON DESIGNS, INC
Model 2265
ANALOG ACCELEROMETER MODULE
!
Low-Cost, Accurate, Easy-to-Use Alternative to
Piezoresistive Accelerometers
!
Sensitivity Insensitive to Variations in Excitation
Voltage, Temperature and Cable Resistance
!
Frequency Response Insensitive to Temperature
!
9 to 12V Excitation; ±5V Nominal
!
Large Differential Output Signal / EMI Resistant
!
Capacitive Micromachined
!
Nitrogen Damped to 0.7 (nominal)
!
Sensitivity Accurate to 2% (typical)
!
-40 to +85EC Operation
E
!
Traditional Four Wire Connection
!
Responds to DC and AC Accelerations
!
Rugged Anodized Aluminum Module & PTFE Cable
!
Serialized for Traceability
!
Non-Standard g Ranges Available
!
Other Excitation Voltages Available
ORDERING INFORMATION
Full Scale
Acceleration
± 5g
± 10 g
± 25 g
± 50 g
±100 g
±200 g
Model
Number
2265-005
2265-010
2265-025
2265-050
2265-100
2265-200
DESCRIPTION
The model 2265 accelerometer is a high performance and wide temperature range accelerometer intended to directly
replace piezoresistive units for existing and new applications. It uses a capacitive sensing element and an advanced
ASIC to simulate the operation of a piezoresistive bridge. It is tailored for zero to medium frequency instrumentation
applications. The anodized aluminum case is epoxy sealed and is easily mounted via two #4 (or M3) screws. Internal
regulation is provided to essentially eliminate the effects of excitation voltage variation. Unlike piezoresistive
elements, its sensitivity, bias and frequency response are insensitive to temperature changes and gradients. The
cable shield is electrically connected to the anodized aluminum case, and the power and signal wires are isolated
from the case. An optional initial calibration sheet (2265-CAL) and periodic calibration checking are also available.
OPERATION
The Model 2265 is normally operated with a source of ±5 volt excitation and produces two analog voltage outputs
which vary with acceleration as shown in the graph on the next page. The sensitive axis is perpendicular to the
bottom of the package, with positive acceleration resulting from a force pushing on the bottom of the package. The
signal outputs are fully differential about a common mode voltage of 0 volts. The output sensitivity or scale factor is
independent of changes in the excitation voltage. At zero acceleration the output differential voltage is nominally 0
volts DC; at ±full scale acceleration the output differential voltage is ±4 volts DC respectively. A single +10V supply
may be used by connecting
-Exc
to ground and
+Exc
to +10V but the average value of the
+OUT
and
-OUT
signals will
be at +5V instead of 0V and each output will swing from +3 to +7V
APPLICATIONS
!
CRASH TESTING
!
VIBRATION MONITORING
!
VIBRATION ANALYSIS
!
MACHINE CONTROL
!
MODAL ANALYSIS
!
ROBOTICS
!
FLIGHT TESTING
!
MACHINERY INSTRUMENTATION
Silicon Designs, Inc.
!
1445-NW Mall Street, Issaquah, WA 98027-5344
!
Phone: 425-391-8329
!
Fax: 425-391-0446
web site:
www.silicondesigns.com
[page 1]
Oct 06
Model
2265
Analog Accelerometer Module
SIGNAL DESCRIPTIONS
(28 gauge wires + shield)
Power: +Exc (Red) and -Exc (Black):
+Exc (+4.5 to +6.0 VDC)
and -Exc (-4.5 to -6.0 VDC).
+Out (Green) and -Out (White):
+Out minus -Out voltage is
proportional to acceleration; +Out voltage increases and -Out
decreases with positive acceleration. At zero acceleration both
outputs are nominally equal to mid-way between the +Exc and the
-Exc values. The device experiences positive (+1g) acceleration
with its lid (part number) facing up in the Earth’s gravitational field.
Either output can be used individually or the two outputs can be
used differentially. (See output response plot below)
PERFORMANCE
- By Model:
+Exc=+5,
-Exc=-5VDC, T
C
=25EC
MODEL NUMBER
Input Range
Frequency Response
(Nominal, -3 dB)
Sensitivity, Differential
Output Noise, Differential
(RMS, typical)
Max. Mechanical Shock
(0.1 ms)
2265-005 2265-010 2265-025 2265-050 2265-100 2265-200
±5
0 - 600
800
9
±10
0 - 1000
400
10
±25
0 - 1500
160
25
2000
±50
0 - 2000
80
50
±100
0 - 2500
40
100
+/-200
0 - 3000
20
200
UNITS
g
Hz
mV/g
µg/(root
Hz)
g
PERFORMANCE
- All Models:
Unless otherwise specified,
+Exc=+5,
-Exc=-5VDC, T
C
=25EC, Differential Mode.
PARAMETER
Cross Axis Sensitivity
Bias Calibration Error
Bias Temperature Shift
(T
C
= -40 to +85EC)
Sensitivity Calibration Error
Sensitivity Temperature Shift
(T
C
= -40 to +80EC)
Non-Linearity
1
(-90 to +90% of Full Scale)
2
MIN
TYP
1
50
2
MAX
2
1.5
100
3
+150
0.5
1.0
1000
+0.25
±6.0
20
UNITS
%
% of span
(ppm of span)/EC
%
ppm/EC
% of span
%
VDC
VDC
mA DC
mA/volt
grams
grams/meter
-005 thru -010
-025 thru -200
-250
-150
0
0.3
0.5
0.2
850
0
±5.0
16
3
6
14
-005 thru -050
-100 & -200
Sensitivity Change with Excitation Voltage (9-12 volts)
Small Signal Differential Output Impedance
Output Common Mode Voltage
2
Operating Voltage (+Exc/-Exc)
Operating Current
(+Out and -Out open)
Change in Operating Current to Excitation Voltage
Mass
(not including cable)
Cable Mass
Note 1: 100g versions and above are tested from -65g to +65g.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
800
-0.25
±4.5
Note 2: Voltage between +Exc and -Exc must not exceed 12V.
Silicon Designs, Inc.
!
1445-NW Mall Street, Issaquah, WA 98027-5344
!
Phone: 425-391-8329
!
Fax: 425-391-0446
web site:
www.silicondesigns.com
[page 2]
Oct 06
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