Silicon Designs Model 1221 Low Noise Analog Accel ±4V Differential Output - Silicon Designs - #1

Text version of the page

SILICON DESIGNS, INC Model 1221 Low Noise Analog Accelerometer SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Silicon Designs, Inc. • 1445-NW Mall Street, Issaquah, WA 98027-5344 • Phone: 425-391-8329 • Fax: 425-391-0446 www.silicondesigns.com [page 1] Nov 09 • Low Noise: 5 ìg/ÖHz ___ 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 Acceleration 20 pin LCC 20 pin JLCC ± 2 g ± 5 g ± 10 g ± 25 g ± 50 g ±100 g ±200 g * ±400 g * 1221L-002 1221L-005 1221L-010 1221L-025 1221L-050 1221L-100 1221L-200 1221L-400 1221J-002 1221J-005 1221J-010 1221J-025 1221J-050 1221J-100 1221J-200 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. APPLICATIONS • Seismic Monitoring • Appliances • Earthquake Detection • Robotics • Security Systems • Crash Testing • Machine Control • Vibration Monitoring • Modal Analysis • Vibration Analysis • Instrumentation • Vehicle Dynamics PERFORMANCE ACCELERATION OUTPUT VOLTAGE 2 -Full Scale 1 0 5 4 3 AON 0 + Full Scale AOP