SDI 1410 DIGITAL PULSE DENSITY SURFACE MOUNT ACCELEROMETERS
The SDI Model 1410 Specialty Digital Pulse Density Accelerometer is a unique accelerometer designed for use in DC to medium frequency instrumentation applications measuring acceleration exclusively. The Model 1410 produces a digital pulse train in which the density of pulses (number of pulses per second) is proportional to applied acceleration. It requires a single +5 volt power supply and a TTL/CMOS level clock of 100kHz-1MHz.
The output is ratiometric to the clock frequency and independent of the power supply voltage. Two forms of digital signals are provided for direct interfacing to a microprocessor or counter. 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. External digital line drivers can be used to drive long cables or when used in an electrically noisy environment.
AVAILABLE
G-RANGES
± 2 g
± 5 g
± 10 g
± 25 g
± 50 g
± 100 g
± 200 g
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Integrated Sensor & Amplifier
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-55 to +125 °C Operation
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+5 VDC, 2 mA Power (typical)
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LCC or J-Lead Surface Mount Package
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Responds to DC & AC Acceleration
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No External Reference Voltage
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Easy Interface to Microprocessors, TTL/CMOS Compatible
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Nitrogen Damped & Hermetically Sealed
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Capacitive Micromachined & Serialized for Traceability
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Good EMI Resistance
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RoHS Compliant
Quick Links
Each miniature, hermetically sealed package combines a micro-machined capacitive sense element and a custom integrated circuit that includes a sense amplifier and sigma-delta A/D converter.
Every Model 1410 accelerometer undergoes individual testing, programming, and calibration by SDI, and is marked with a serial number on its top and bottom surfaces for easy traceability.
ZERO TO MEDIUM FREQUENCY APPLICATIONS
Input Range | Model Suffix
(e.g. 1410L-010) | Frequency Response
(Minimum, clock@ 250kHz) | Sensitivity,
Differential | Max. Mechanical
Shock (0.1 ms) |
|---|---|---|---|---|
g | # | Hz | kHz/g | g (peak) |
±2 | -2 | 0 - 400 | 62.5 | 2000 |
±5 | -5 | 0 - 500 | 25 | 2000 |
±10 | -10 | 0 - 700 | 12.5 | 5000 |
±25 | -25 | 0 - 1000 | 5 | 5000 |
±50 | -50 | 0 - 1300 | 2.5 | 5000 |
±100 | -100 | 0 - 1600 | 1.25 | 5000 |
±200 | -200 | 0 - 1900 | 0.625 | 5000 |
OPERATION
The Model 1521 produces a differential +/-4 volts output voltage or single ended mode, 0.5 – 4.5 volts full scale, the value of which varies with acceleration as shown in the figures below. The sensitive axis is perpendicular to the bottom of the package, with positive acceleration resulting from a positive force pushing on the bottom of the package. The seismic center is located on a centerline through the dual sense elements and halfway between them. The internal electronics effectively cancel any errors due to rotation.
Two reference voltages, +5.0 and +2.5 volts (nominal), are required; scale factor is ratiometric to the +5.0 volt reference voltage relative to GND, and both outputs at zero acceleration are the same as the +2.5 volt input.
PERFORMANCE - ALL VERSIONS
All Models: Unless otherwise specified VDD=VR=5.0 VDC, FCLK=250 kHz, TC=25°C
PARAMETER | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|
Cross Axis Sensitivity | 2 | 3 | ± % | |
Bias Calibration Error | 0.2 | 0.5 | ± % of FCLK (span) | |
Bias Temperature Shift (TC= -55 to +125°C) | -200 | 0 | 200 | (PPM of FCLK)/°C |
Scale Factor Calibration Error * | 0.75 | 2 | ± % | |
Scale Factor Temperature Shift (TC= -55 to +125°C) | 0 | 200 | PPM/°C | |
Non-Linearity (-90 to +90% of Full Scale) * | 0.5 | 1 | ± % of span | |
Long Term Bias Stability | 1000 | 2000 | ± PPM of span | |
In Run Bias Stability | 18 | 30 | ± PPM of span | |
Long Term Scale Factor Stability | 500 | 1000 | ± PPM | |
Turn-On Transient (in less than 0.5ms) | 38 | ± PPM of span | ||
Operating Voltage (VDD vs. GND) | 4.5 | 5 | 5.5 | Volts |
Operating Current (IDD + IVR)* | 2 | 3 | mA | |
Clock Input Voltage Range (with respect to GND) | -0.5 | VDD+0.5 | Volts | |
Mass ‘L’ Package (add 0.06 grams for ‘J’ package) | 0.62 | Grams | ||
Cross Axis Sensitivity | 2 | 3 | ± % | |
Bias Calibration Error ¹ | 0.2 | 0.5 | ± % of FCLK (span) | |
Bias Temperature Shift (TC= -55 to +125°C) ¹ | -200 | 0 | 200 | (PPM of FCLK)/°C |
Scale Factor Calibration Error 1,2 | 0.75 | 2 | ± % | |
Scale Factor Temperature Shift (TC= -55 to +125°C) ¹ | 0 | 200 | PPM/°C | |
Non-Linearity (-90 to +90% of Full Scale) 1,2 | 0.5 | 1 | ± % of span | |
Long Term Bias Stability | 1000 | 2000 | ± PPM of span | |
In Run Bias Stability | 18 | 30 | ± PPM of span | |
Long Term Scale Factor Stability | 500 | 1000 | ± PPM | |
Turn-On Transient (in less than 0.5ms) | 38 | ± PPM of span | ||
Operating Voltage (VDD vs. GND) | 4.5 | 5 | 5.5 | Volts |
Operating Current (IDD + IVR)1 | 2 | 3 | mA | |
Clock Input Voltage Range (with respect to GND) | -0.5 | VDD+0.5 | Volts | |
Mass ‘L’ Package (add 0.06 grams for ‘J’ package) | 0.62 | Grams | ||
Note 1: Tighter tolerances may be available on special order. | ||||
Note 2: 100g and greater versions are tested and specified from -65 to +65g |
* 100g and greater versions are tested and specified from -65 to +65g
PACKAGE DIMENSIONS
Please see the data sheet for sensor location and other additional details.
