Silicon Designs Model 1221 Low Noise Analog Accel ±4V Differential Output0 pages

SILICON DESIGNS, INC.
Advanced Accelerometer Solutions
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Model 1221
Low Noise Analog Accelerometer
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Low Noise: 5 μg/√Hz typical for 2g Full Scale Version
Internal Temperature Sensor
Capacitive Micromachined
Nitrogen Damped & Hermetically Sealed
±4V Differential Output or 0.5V to 4.5V Single Ended Output
Fully Calibrated
Responds to DC and 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
RoHS Compliant
Available G-Ranges
Full Scale
20 pin LCC
20 pin JLCC
Acceleration
±2g
1221L-002
1221J-002
1221L-005
1221J-005
±5g
± 10 g
1221L-010
1221J-010
± 25 g
1221L-025
1221J-025
1221L-050
1221J-050
± 50 g
±100 g
1221L-100
1221J-100
±200 g *
1221L-200
1221J-200
±400 g *
1221L-400
1221J-400
* Recommended for Down Hole Drilling
DESCRIPTION
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 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.
OPERATION
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. 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 nominally +2.5
volts. 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.
• Seismic Monitoring
• Earthquake Detection
• Security Systems
• Machine Control
• Modal Analysis
• Instrumentation
• Appliances
• Robotics
• Crash Testing
• Vibration Monitoring
• Vibration Analysis
• Vehicle Dynamics
OUTPUT VOLTAGE
5
APPLICATIONS
4
AO
N
P
AO
3
2
1
0
-Full Scale
0
+ Full Scale
ACCELERATION
0.350
"L" SUFFIX
PACKAGE
0.350
Positive
Acceleration
0.350
0.105
"J" SUFFIX
PACKAGE
0.350
Positive
Acceleration
0.165
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
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Silicon Designs, Inc. • 13905 NE 128 Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446
www.silicondesigns.com
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September 2012