Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

ADXL210E Datasheet(PDF) 10 Page - Analog Devices

No. de pieza ADXL210E
Descripción Electrónicos  Low-Cost 10 g Dual-Axis Accelerometer with Duty Cycle
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

ADXL210E Datasheet(HTML) 10 Page - Analog Devices

Back Button ADXL210E Datasheet HTML 4Page - Analog Devices ADXL210E Datasheet HTML 5Page - Analog Devices ADXL210E Datasheet HTML 6Page - Analog Devices ADXL210E Datasheet HTML 7Page - Analog Devices ADXL210E Datasheet HTML 8Page - Analog Devices ADXL210E Datasheet HTML 9Page - Analog Devices ADXL210E Datasheet HTML 10Page - Analog Devices ADXL210E Datasheet HTML 11Page - Analog Devices ADXL210E Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 10 / 12 page
background image
REV. 0
ADXL210E
–10–
With the single pole roll-off characteristic, the typical noise of
the ADXL210E is determined by the following equation:
Noise rms
Hz
BW
() =
()××
()
200
1 6
µg/
.
At 100 Hz the noise will be:
Noise rms
Hz
m
() =
()×× ()
 =
200
100
1 6
2 53
µgg
/.
.
Often the peak value of the noise is desired. Peak-to-peak noise
can only be estimated by statistical methods. Table III is useful
for estimating the probabilities of exceeding various peak values,
given the rms value.
Table III. Estimation of Peak-to-Peak Noise
% of Time that Noise
Nominal Peak-to-Peak
Will Exceed Nominal
Value
Peak-to-Peak Value
2.0
× rms
32%
4.0
× rms
4.6%
6.0
× rms
0.27%
8.0
× rms
0.006%
The peak-to-peak noise value will give the best estimate of the
uncertainty in a single measurement.
Table IV gives typical noise output of the ADXL210E for various
CX and CY values.
Table IV. Filter Capacitor Selection, CX and CY
Peak-to-Peak Noise
Estimate 95%
Bandwidth
CX, CY
rms Noise
Probability (rms
4)
10 Hz
0.47
µF
0.8 mg
3.2 mg
50 Hz
0.10
µF
1.8 mg
7.2 mg
100 Hz
0.05
µF
2.5 mg
10.1 mg
200 Hz
0.027
µF 3.6 mg
14.3 mg
500 Hz
0.01
µF
5.7 mg
22.6 mg
CHOOSING T2 AND COUNTER FREQUENCY: DESIGN
TRADE-OFFS
The noise level is one determinant of accelerometer resolution.
The second relates to the measurement resolution of the counter
when decoding the duty cycle output.
The ADXL210E’s duty cycle converter has a resolution of
approximately 14 bits; better resolution than the accelerometer
itself. The actual resolution of the acceleration signal is, how-
ever, limited by the time resolution of the counting devices used
to decode the duty cycle. The faster the counter clock, the higher
the resolution of the duty cycle and the shorter the T2 period
can be for a given resolution. The following table shows some of
the trade-offs. It is important to note that this is the resolution
due to the microprocessors’ counter. It is probable that the
accelerometer’s noise floor may set the lower limit on the resolu-
tion, as discussed in the previous section.
MICROCOMPUTER INTERFACES
The ADXL210E is specifically designed to work with low-cost
microcontrollers. Specific code sets, reference designs, and applica-
tion notes are available from the factory. This section will outline a
general design procedure and discuss the various trade-offs that
need to be considered.
The designer should have some idea of the required performance
of the system in terms of:
Resolution: the smallest signal change that needs to be detected.
Bandwidth: the highest frequency that needs to be detected.
Acquisition Time: the time that will be available to acquire the signal
on each axis.
These requirements will help to determine the accelerometer band-
width, the speed of the microcontroller clock and the length of
the T2 period.
When selecting a microcontroller it is helpful to have a counter
timer port available. The microcontroller should have provisions
for software calibration. While the ADXL210E is a highly accurate
accelerometer, it has a wide tolerance for initial offset. The
easiest way to null this offset is with a calibration factor saved on
the microcontroller or by a user calibration for zero g. In the
case where the offset is calibrated during manufacture, there are
several options, including external EEPROM and microcontrol-
lers with “one-time programmable” features.
DESIGN TRADE-OFFS FOR SELECTING FILTER
CHARACTERISTICS: THE NOISE/BW TRADE-OFF
The accelerometer bandwidth selected will determine the measure-
ment resolution (smallest detectable acceleration). Filtering can be
used to lower the noise floor and improve the resolution of the
accelerometer. Resolution is dependent on both the analog filter
bandwidth at XFILT and YFILT and on the speed of the micro-
controller counter.
The analog output of the ADXL210E has a typical bandwidth
of 5 kHz, while the duty cycle modulators’ bandwidth is 500 Hz.
The user must filter the signal at this point to limit aliasing
errors. To minimize DCM errors the analog bandwidth should be
less than one-tenth the DCM frequency. Analog bandwidth
may be increased to up to half the DCM frequency in many
applications. This will result in greater dynamic error generated
at the DCM.
The analog bandwidth may be further decreased to reduce noise
and improve resolution. The ADXL210E noise has the character-
istics of white Gaussian noise that contributes equally at all
frequencies and is described in terms of
µg per root Hz; i.e., the
noise is proportional to the square root of the bandwidth of the
accelerometer. It is recommended that the user limit bandwidth to
the lowest frequency needed by the application to maximize the
resolution and dynamic range of the accelerometer.


Número de pieza similar - ADXL210E

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
ADXL210 AD-ADXL210 Datasheet
124Kb / 11P
   Low Cost -2 g/-10 g Dual Axis iMEMS Accelerometers with Digital Output
REV. B
ADXL210AQC AD-ADXL210AQC Datasheet
124Kb / 11P
   Low Cost -2 g/-10 g Dual Axis iMEMS Accelerometers with Digital Output
REV. B
ADXL210JQC AD-ADXL210JQC Datasheet
124Kb / 11P
   Low Cost -2 g/-10 g Dual Axis iMEMS Accelerometers with Digital Output
REV. B
ADXL210 AD-ADXL210_15 Datasheet
819Kb / 11P
   Accelerometers with Digital Output
More results

Descripción similar - ADXL210E

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Analog Devices
ADXL202E AD-ADXL202E_15 Datasheet
147Kb / 12P
   Low-Cost 2 g Dual-Axis Accelerometer with Duty Cycle Output
ADXL202E AD-ADXL202E Datasheet
154Kb / 12P
   Low-Cost -2 g Dual-Axis Accelerometer with Duty Cycle Output
REV. A
ADXL213 AD-ADXL213_15 Datasheet
196Kb / 12P
   Low Cost 1.2 g Dual Axis Accelerometer
ADXL213 AD-ADXL213 Datasheet
359Kb / 12P
   Low Cost 1.2 g Dual Axis Accelerometer
REV. 0
logo
List of Unclassifed Man...
MXD7210GL ETC-MXD7210GL Datasheet
647Kb / 10P
   Low Cost, Low Noise -10 g Dual Axis Accelerometer with Digital Outputs
logo
Analog Devices
ADXL311 AD-ADXL311 Datasheet
419Kb / 12P
   Low Cost, Ultracompact 짹2 g Dual-Axis Accelerometer
REV. A
logo
List of Unclassifed Man...
MXD2002A ETC1-MXD2002A Datasheet
572Kb / 8P
   Low Cost, 짹10 g Dual Axis Accelerometer with Digital Outputs
logo
MEMSIC Semiconductor (T...
MXP7205VF MEMSIC-MXP7205VF Datasheet
603Kb / 12P
   Low Cost 짹5 g Dual-Axis Accelerometer with SPI Interface
Rev.E
MXP7205VW MEMSIC-MXP7205VW Datasheet
553Kb / 12P
   Low Cost 짹5 g Dual-Axis Accelerometer with SPI Interface
Rev.D
MXR7999V MEMSIC-MXR7999V Datasheet
95Kb / 6P
   Low Cost 짹1.7 g Dual-Axis Accelerometer with Ratiometric Outputs
Rev.A
More results


Html Pages

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


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
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