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参数资料
| 型号： | ADXL213EB |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Low Cost 1.2 g Dual Axis Accelerometer |
| 中文描述： | 低成本一点二克双轴加速度计 |
| 文件页数： | 8/12页 |
| 文件大小： | 359K |
| 代理商： | ADXL213EB |
ADXL213
THEORY OF OPERATION
Rev. 0 | Page 8 of 12
EARTH'S SURFACE
0
TOP VIEW
(Not to Scale)
PIN 8
X
OUT
= 50%
Y
OUT
= 80%
X
OUT
= 50%
Y
OUT
= 50%
PIN 8
X
OUT
= 50%
Y
OUT
= 20%
PIN 8
X
OUT
= 80%
Y
OUT
= 50%
PIN 8
X
OUT
= 20%
Y
OUT
= 50%
Figure 21. Output Response vs. Orientation
The ADXL213 is a complete dual axis acceleration measure-
ment system on a single monolithic IC. It contains a polysilicon
surface-micromachined sensor and signal conditioning
circuitry to implement an open-loop acceleration measurement
architecture. The output signals are duty cycle modulated digital
signals proportional to acceleration. The ADXL213 is capable of
measuring both positive and negative accelerations to ±1.2
g
.
The accelerometer can measure static acceleration forces such
as gravity, allowing the ADXL213 to be used as a tilt sensor.
The sensor is a surface-micromachined polysilicon structure
built on top of the silicon wafer. Polysilicon springs suspend the
structure over the surface of the wafer and provide a resistance
against acceleration forces. Deflection of the structure is mea-
sured using a differential capacitor that consists of independent
fixed plates and plates attached to the moving mass. The fixed
plates are driven by 180° out-of-phase square waves. Accelera-
tion deflects the beam and unbalances the differential capacitor,
resulting in an output square wave whose amplitude is propor-
tional to acceleration. Phase sensitive demodulation techniques
are then used to rectify the signal and determine the direction
of the acceleration.
The output of the demodulator is amplified and brought off-
chip through a 32 k resistor. At this point, the user can set the
signal bandwidth of the device by adding a capacitor. This
filtering improves measurement resolution and helps prevent
aliasing.
After being low-pass filtered, the duty cycle modulator converts
the analog signals to duty cycle modulated outputs that can be
read by a counter. A single resistor (R
SET
) sets the period for a
complete cycle. A 0
g
acceleration produces a 50% nominal duty
cycle. The acceleration can be determined by measuring the
length of the positive pulse width (
t1
) and the period (
t2
). The
nominal transfer function of the ADXL213 is
Acceleration
= ((
t1
/
t2
) –
Zero
g
Bias
)/
Sensitivity
Where in the case of the ADXL213
Zero g
Bias
= 50%
nominal
Sensitivity
= 30%/
g
nominal
t2
=
R
SET
/125 MΩ
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques have been used to ensure
that high performance is built in. As a result, there is essentially
no quantization error or nonmonotonic behavior, and
temperature hysteresis is very low (typically less than 10 m
g
over the –40°C to +85°C temperature range).
Figure 9 shows the zero
g
output performance of eight parts (X
and Y axis) over a –40°C to +85°C temperature range.
Figure 12 demonstrates the typical sensitivity shift over
temperature for V
S
= 5 V. Sensitivity stability is optimized for
V
S
= 5 V, but is still very good over the specified range; it is
typically better than ±2% over temperature at V
S
= 3 V.
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相关代理商/技术参数 |
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|---|---|
| ADXL213WAEZA-REEL | 制造商:Analog Devices 功能描述: |
| ADXL250 | 制造商:AD 制造商全称:Analog Devices 功能描述:+-5 g to +-50 g, Low Noise, Low Power, Single/Dual Axis iMEMS Accelerometers |
| ADXL250AQC | 制造商:Analog Devices 功能描述:Special Function IC Package/Case:14-SOIC |
| ADXL250EB | 制造商:Analog Devices 功能描述:Dual Axis Accelerometer Evaluation Board For The Adxl150 And Adxl250 Accelerometers 制造商:Analog Devices 功能描述:Special Function IC |
| ADXL250JQC | 制造商:Analog Devices 功能描述:Accelerometer Dual 制造商:Analog Devices 功能描述:Special Function IC Package/Case:14-SOIC |
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