数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

ADXL204EB 数据表(PDF) 10 Page - Analog Devices

部件名 ADXL204EB
功能描述  Precisionc -1.7 g Single-/Dual-Axis i MEMS Accelerometer
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADXL204EB 数据表(HTML) 10 Page - Analog Devices

Back Button ADXL204EB Datasheet HTML 4Page - Analog Devices ADXL204EB Datasheet HTML 5Page - Analog Devices ADXL204EB Datasheet HTML 6Page - Analog Devices ADXL204EB Datasheet HTML 7Page - Analog Devices ADXL204EB Datasheet HTML 8Page - Analog Devices ADXL204EB Datasheet HTML 9Page - Analog Devices ADXL204EB Datasheet HTML 10Page - Analog Devices ADXL204EB Datasheet HTML 11Page - Analog Devices ADXL204EB Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 10 / 12 page
background image
ADXL204
Rev. A | Page 10 of 12
APPLICATIONS
POWER SUPPLY DECOUPLING
For most applications, a single 0.1 μF capacitor, CDC, adequately
decouples the accelerometer from noise on the power supply.
However in some cases, particularly where noise is present at
the 140 kHz internal clock frequency (or any harmonic thereof),
noise on the supply can cause interference on the ADXL204
output. If additional decoupling is needed, a 100 Ω, or smaller,
resistor or ferrite bead can be inserted in the supply line of the
ADXL204. Additionally, a larger bulk bypass capacitor, in the
1 μF to 22 μF range, can be added in parallel to CDC.
SETTING THE BANDWIDTH USING CX AND CY
The ADXL204 has provisions for bandlimiting the XOUT and
YOUT pins. Capacitors must be added at these pins to implement
low-pass filtering for antialiasing and noise reduction. The
equation for the 3 dB bandwidth is
F–3 dB = 1/(2π(32 kΩ) × C(X, Y))
or more simply,
F–3 dB = 5 μF/C(X, Y)
The tolerance of the internal resistor (RFILT) can vary typically as
much as ±25% of its nominal value (32 kΩ); thus, the band-
width varies accordingly. A minimum capacitance of 2000 pF
for CX and CY is required in all cases.
Table 6. Filter Capacitor Selection, CX and CY
Bandwidth (Hz)
Capacitor (μF)
1
4.7
10
0.47
50
0.10
100
0.05
200
0.027
500
0.01
SELF TEST
The ST pin controls the self-test feature. When this pin is set to
VS, an electrostatic force is exerted on the beam of the accelero-
meter. The resulting movement of the beam allows the user to
test if the accelerometer is functional. The typical change in
output is 325 mg (corresponding to 200 mV). This pin can be
left open-circuit or connected to common in normal use.
The ST pin should never be exposed to voltage greater than
VS + 0.3 V. If the system design is such that this condition
cannot be guaranteed (that is, multiple supply voltages present),
a low VF clamping diode between ST and VS is recommended.
DESIGN TRADE-OFFS FOR SELECTING FILTER
CHARACTERISTICS: THE NOISE/BW TRADE-OFF
The accelerometer bandwidth selected ultimately determines
the measurement resolution (smallest detectable acceleration).
Filtering can be used to lower the noise floor, which improves
the resolution of the accelerometer. Resolution is dependent on
the analog filter bandwidth at XOUT and YOUT.
The output of the ADXL204 has a typical bandwidth of 2.5 kHz.
The user must filter the signal at this point to limit aliasing
errors. The analog bandwidth must be no more than half the
A/D sampling frequency to minimize aliasing. The analog
bandwidth can be further decreased to reduce noise and
improve resolution.
The ADXL204 noise has the characteristics of white Gaussian
noise, which contributes equally at all frequencies and is
described in terms of μg/√Hz (that is, the noise is proportional
to the square root of the accelerometer’s bandwidth). The user
should limit bandwidth to the lowest frequency needed by the
application to maximize the resolution and dynamic range of
the accelerometer.
With the single-pole, roll-off characteristic, the typical noise of
the ADXL204 is determined by
rmsNoise = (170 μg/√Hz) × (√BW×1.6)
At 100 Hz the noise is
rmsNoise = (170 μg/√Hz) × (√BW×1.6) = 2.15 mg
Often, the peak value of the noise is desired. Peak-to-peak noise
can only be estimated by statistical methods. Table 7 is useful
for estimating the probabilities of exceeding various peak
values, given the rms value.
Table 7. Estimation of Peak-to-Peak Noise
Peak-to-Peak Value
% of Time Noise Exceeds
Nominal Peak-to-Peak Value
2 × rms
32
4 × rms
4.6
6 × rms
0.27
8 × rms
0.006


类似零件编号 - ADXL204EB

制造商部件名数据表功能描述
logo
Analog Devices
ADXL202 AD-ADXL202 Datasheet
124Kb / 11P
   Low Cost -2 g/-10 g Dual Axis iMEMS Accelerometers with Digital Output
REV. B
ADXL202AE AD-ADXL202AE Datasheet
154Kb / 12P
   Low-Cost -2 g Dual-Axis Accelerometer with Duty Cycle Output
REV. A
ADXL202AQC AD-ADXL202AQC Datasheet
124Kb / 11P
   Low Cost -2 g/-10 g Dual Axis iMEMS Accelerometers with Digital Output
REV. B
ADXL202E AD-ADXL202E Datasheet
154Kb / 12P
   Low-Cost -2 g Dual-Axis Accelerometer with Duty Cycle Output
REV. A
ADXL202E AD-ADXL202E Datasheet
147Kb / 12P
   Low-Cost 2 g Dual-Axis Accelerometer with Duty Cycle Output
More results

类似说明 - ADXL204EB

制造商部件名数据表功能描述
logo
Analog Devices
ADXL103 AD-ADXL103_15 Datasheet
853Kb / 16P
   Precision 1.7 g, 5 g, 18 g Single-/ Dual-Axis iMEMS Accelerometer
Rev. E
ADXL203 AD-ADXL203_15 Datasheet
853Kb / 16P
   Precision 1.7 g, 5 g, 18 g Single-/ Dual-Axis iMEMS Accelerometer
ADXL323 AD-ADXL323 Datasheet
293Kb / 16P
   Small, Low Power, 2-Axis 짹3 g i MEMS Accelerometer
REV. 0
ADXL330 AD-ADXL330 Datasheet
311Kb / 16P
   Small, Low Power, 3-Axis 짹3 g i MEMS Accelerometer
REV. 0
ADXL103 AD-ADXL103 Datasheet
438Kb / 12P
   Precision 짹1.7 g Single/Dual Axis Accelerometer
REV. 0
ADXL373 AD-ADXL373 Datasheet
1Mb / 52P
   Micropower, 3-Axis, 짹400 g, Digital Output, MEMS Accelerometer
ADXL278 AD-ADXL278 Datasheet
196Kb / 12P
   Dual-Axis, High-g, MEMS Accelerometers
REV. A
AD22293Z AD-AD22293Z Datasheet
618Kb / 16P
   Precision 짹1.7 g, 짹5 g, 짹18 g Single-/ Dual-Axis iMEMS짰 Accelerometer
REV. D
ADXL367 AD-ADXL367 Datasheet
2Mb / 64P
   Micropower, 3-Axis, 짹2 g/짹4 g/짹8 g Digital Output MEMS Accelerometer
Rev. 0
ADXL213 AD-ADXL213_15 Datasheet
196Kb / 12P
   Low Cost 1.2 g Dual Axis Accelerometer
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com