identifyingDual-Axis, High-g , i MEMS ® Accelerometers
ADXL278
初中物理电学知识点总结
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its u, nor for any infringements of patents or other rights of third parties that may result from its u.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights rerved.
FEATURES
Complete dual-axis acceleration measurement system on a single monolithic IC
Available in ±35 g /±35 g , ±50 g /±50 g , or ±70 g /±35 g output full-scale ranges
Full differential nsor and circuitry for high resistance to EMI/RFI
2021英语四级成绩查询入口官网Environmentally robust packaging
Complete mechanical and electrical lf-test on digital command
Output ratiometric to supply
Sensitive axes in the plane of the chip High linearity (0.2% of full scale) Frequency respon down to dc Low noi
暮光之城片尾曲Low power consumption
Tight nsitivity tolerance and 0 g offt capability Largest available prefilter clipping headroom 400 Hz, 2-pole Besl filter Single-supply operation
Compatible with Sn/Pb and Pb-free solder process
APPLICATIONS
Vibration monitoring and control Vehicle collision nsing Shock detection
GENERAL DESCRIPTION
The ADXL278 is a low power, complete, dual-axis
accelerometer with signal conditioned voltage outputs that are on a single monolithic IC. This product measures acceleration with a full-scale range of (X-axis/Y-axis) ±35 g /±35 g , ±50 g / ±50 g , or ±70 g /±35 g (minimum). The ADXL278 can also measure both dynamic acceleration (vibration) and static acceleration (gravity).
The ADXL278 is the fourth-generation surface micromachined i MEMS® accelerometer from ADI with enhanced performance and lower cost. Designed for u in front and side impact airbag applica
tions, this product also provides a complete cost-effective solution uful for a wide variety of other applications. The ADXL278 is temperature stable and accurate over the automotive temperature range, with a lf-test feature that fully exercis all the mechanical and electrical elements of the nsor with a digital signal applied to a single pin.
The ADXL278 is available in a 5 mm × 5 mm × 2 mm, 8-terminal ceramic LCC package.
FUNCTIONAL BLOCK DIAGRAM
05365-001
Y OUT
X OUT
Figure 1.
ADXL278
Rev. A | Page 2 of 12
antcityTABLE OF CONTENTS
<3 Absolute 4 4 Pin Configuration and 5 Theory .8 Power 8 Clock Frequency 8 8 9 Ordering Guide.. (9)
REVISION HISTORY
5/05—Rev. 0 to Rev. A
ADXL278
Rev. A | Page 3 of 12
SPECIFICATIONS 1
At T A = −40°C to +105°C, 5.0 V dc ± 5%, acceleration = 0 g, unless otherwi noted. Table 1.
Model No. AD22284 Model No. AD22285 Model No. AD22286 Parameter Conditions Min Typ Max Min Typ Max Axis Min Typ Max Unit SENSOR
Output Full-Scale Range I OUT ≤ ±100 μA 37 55 X 70
g Y 37 g Nonlinearity 0.2 2 0.2 2 0.2 2 % Package Alignment Error 1 1 1 Degree
Sensor-to-Sensor
Alignment Error 0.1 0.1 0.1 Degree Cross-Axis Sensitivity −5 +5 −5 +5 −5 +5 % Resonant Frequency 24 24 24 kHz
Sensitivity, Ratiometric (Over Temperature) V DD = 5 V,
100 Hz 52.25 55 57.75 36.1 38 39.9 X 25.65 27 28.35 mV/g Y 52.25 55 57.75 mV/g OFFSET
老规矩Zero-g Output Voltage (Over Temperature)2
V OUT − V DD /2,
V DD = 5 V −150 +150 −150 +150 X −100 +100 mV Y −150 +150 mV NOISE
ADXL278
Rev. A | Page 4 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating Acceleration (Any Axis, Unpowered) 4,000 g Acceleration (Any Axis, Powered) 4,000 g
V S
−0.3 V to +7.0 V All Other Pins
(COM − 0.3 V) to (V S + 0.3 V) Output Short-Circuit Duration (Any Pin to Common)
Indefinite Operating Temperature Range −65°C to +150°C Storage Temperature
−65°C to +150°C
硕士学位英语考试
Stress above tho listed under Absolute Maximum Ratings may cau permanent damage to the device. This is a stress rating only; functional operation of the device at the or any other conditions above tho indicated in the operational
ction of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) nsitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADXL278
Rev. A | Page 5 of 12
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
05365-002
托福雅思greNC = NO CONNECT
V DD3
Y OUT COM V DD
X OUT
NC
ST
V
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
大学英语六级成绩查询时间Pin No. Mnemonic Description 1 V DD3 3.5 V to 6 V
2 Y OUT
Y Channel Output
3 COM Common
4 ST Self-Test
5 NC Do Not Connect
6 X OUT X Channel Output
7 V DD 3.5 V to 6 V
mouth的音标8 V DD2
3.5 V to 6 V
