SILICON DESIGNS, INC
Model 1221
LOW NOISE ANALOG ACCELEROMETER
ꢀ SENSOR: Capacitive Micromachined
Nitrogen Damped
Hermetically Sealed
___
typical for
ꢀ Low Noise: 5 g/ꢀHz
2g Full Scale Version
ꢀ Internal Temperature Sensor
ꢀ ±4V Differential Output or
0.5V to 4.5V Single Ended Output
ꢀ Fully Calibrated
ꢀ Responds to DC & AC Acceleration
ꢀ -55 to +125 °C Operation
ORDERING INFORMATION
ꢀ +5 VDC, 8 mA Power (typical)
ꢀ Non-Standard g Ranges Available
ꢀ Integrated Sensor & Amplifier
Full Scale
Hermetic Packages
Acceleration
20 pin LCC
20 pin JLCC
1221J-002
1221J-005
1221J-010
1221J-025
1221J-050
1221J-100
1221J-200
1221J-400
±2 g
±5 g
1221L-002
1221L-005
1221L-010
1221L-025
1221L-050
1221L-100
1221L-200
1221L-400
ꢀ LCC or J-Lead Surface
±10 g
±25 g
±50 g
±100 g
±200 g
±400 g
Mount Package
ꢀ Serialized for Traceability
ꢀ Pin Compatible with Model 1210
'(6&5,37,21
The Model 1221 is a low-cost, integrated accelerometer for use in zero to medium frequency instrumentation
applications that require extremely low noise. The 2g version is ideally suited for seismic applications. Each
miniature, hermetically sealed package combines a micro-machined capacitive sense element and a custom
integrated circuit that includes a sense amplifier and differential output stage. It is relativelyinsensitive to temperature
changes and thermal gradients. Each device is marked with a serial number on its bottom surface for traceability.
An optional calibration test sheet (
) is also available which lists the measured bias, scale factor, linearity, operating
1221-TST
current and frequency response.
23(5$7,21
The Model 1221 produces two analog output voltages which varywith acceleration as shown in the figure below. The
outputs can be used either in differential or single ended mode referenced to +2.5 volts. Two reference voltages, +5.0
and +2.5 volts (nominal), are required; the output scale factor is ratiometric to the +5 volt reference voltage, and both
outputs at zero acceleration are equal to the +2.5 volt reference. The sensitive axis is perpendicular to the bottom
of the package, with positive acceleration defined as
a force pushing on the bottom of the package.
$33/,&$7,216
ꢀ Seismic Monitoring
ꢀ Appliances
ꢀ Earthquake Detection ꢀ Robotics
ꢀ Security Systems
ꢀ Machine Control
ꢀ Modal Analysis
ꢀ Instrumentation
ꢀ Crash Testing
ꢀ Vibration Monitoring
ꢀ Vibration Analysis
ꢀ Vehicle Dynamics
Silicon Designs, Inc. 1445 NW Mall Street, Issaquah, WA 98027-5344
web site: www.silicondesigns.com [page 1]
Phone: 425-391-8329
Fax: 425-391-0446
Aug 05
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