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]
Aug 05
SILICON DESIGNS, INC
Model 1221
LOW NOISE ANALOG ACCELEROMETER
SENSOR: Capacitive Micromachined
Nitrogen Damped
Hermetically Sealed
Low Noise: 5 g/
Hz
___
typical for
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
+5 VDC, 8 mA Power (typical)
Non-Standard g Ranges Available
Integrated Sensor & Amplifier
LCC or J-Lead Surface
Mount Package
Serialized for Traceability
Pin Compatible with Model 1210
'(6&5,37,21
ORDERING INFORMATION
Full Scale
Acceleration
Hermetic Packages
20 pin LCC
20 pin JLCC
±2 g
1221L-002
1221J-002
±5 g
1221L-005
1221J-005
±10 g
1221L-010
1221J-010
±25 g
1221L-025
1221J-025
±50 g
1221L-050
1221J-050
±100 g
1221L-100
1221J-100
±200 g
1221L-200
1221J-200
±400 g
1221L-400
1221J-400
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 relatively insensitive 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 (1221-TST) is also available which lists the measured bias, scale factor, linearity, operating
current and frequency response.
23(5$7,21
The Model 1221 produces two analog output voltages which vary with 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
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