ADXL204WCEZA-REEL [ADI]

Analog Circuit;
ADXL204WCEZA-REEL
型号: ADXL204WCEZA-REEL
厂家: ADI    ADI
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Analog Circuit

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Precision ± ±1. g Single-/Dual-Axis  
iMEMS® Accelerometer  
ADXL204  
FEATURES  
GENERAL DESCRIPTION  
High performance, dual-axis accelerometer on a  
single IC chip  
Specified at VS = 3.3 V  
5 mm × 5 mm × 2 mm LCC package  
Better than 2 mg resolution at 60 Hz  
Low power: 500 μA at VS = 3.3 V (typical)  
High zero g bias stability  
The ADXL204 is a high precision, low power, complete dual-  
axis accelerometer with signal-conditioned voltage outputs, all  
on a single monolithic IC. Like the ADXL203, it measures  
acceleration with a full-scale range of 1.7 g; however, the  
ADXL204 is tested and specified for 3.3 V supply voltage,  
whereas the ADXL203 is tested and specified at 5 V. Both parts  
function well over a wide 3 V to 6 V operating voltage range.  
The ADXL204 can measure both dynamic acceleration (for  
example, vibration) and static acceleration (for example, gravity).  
High sensitivity accuracy  
–40°C to +125°C temperature range  
X-axis and Y-axis aligned to within 0.1° (typical)  
BW adjustment with a single capacitor  
Single-supply operation  
The typical noise floor is 170 μg/√Hz, allowing signals below  
2 mg (0.1° of inclination) to be resolved in tilt sensing  
applications using narrow bandwidths (<60 Hz).  
3500 g shock survival  
RoHS compliant  
Compatible with Sn/Pb- and Pb-free solder processes  
The user selects the bandwidth of the accelerometer using  
Capacitor CX and Capacitor CY at the XOUT and YOUT pins.  
Bandwidths of 0.5 Hz to 2.5 kHz can be selected to suit the  
application.  
APPLICATIONS  
Vehicle dynamic control (VDC)/electronic stability program  
(ESP) systems  
Electronic chassis controls  
Electronic braking  
The ADXL204 is available in a 5 mm × 5 mm × 2 mm,  
8-terminal hermetic LCC package.  
Platform stabilization/leveling  
Navigation  
Alarms and motion detectors  
High accuracy, 2-axis tilt sensing  
FUNCTIONAL BLOCK DIAGRAM  
+5V  
V
S
ADXL204  
C
AC  
AMP  
OUTPUT  
AMP  
OUTPUT  
AMP  
DC  
DEMOD  
SENSOR  
COM  
R
R
FILT  
32k  
FILT  
32kΩ  
ST  
Y
X
OUT  
OUT  
C
C
X
Y
Figure 1.  
Rev. A  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
ADXL204  
TABLE OF CONTENTS  
Features .............................................................................................. 1  
Applications..................................................................................... 10  
Power Supply Decoupling ......................................................... 10  
Setting the Bandwidth Using CX and CY ................................. 10  
Self Test........................................................................................ 10  
Applications....................................................................................... 1  
General Description......................................................................... 1  
Functional Block Diagram .............................................................. 1  
Revision History ............................................................................... 2  
Specifications..................................................................................... 3  
Absolute Maximum Ratings............................................................ 4  
ESD Caution.................................................................................. 4  
Pin Configuration and Function Descriptions............................. 5  
Typical Performance Characteristics ............................................. 6  
Theory of Operation ........................................................................ 9  
Performance .................................................................................. 9  
Design Trade-Offs for Selecting Filter Characteristics: The  
Noise/BW Trade-Off.................................................................. 10  
Using the ADXL204 with Operating Voltages  
Other than 3.3 V .......................................................................... 11  
Using the ADXL204 as a Dual-Axis Tilt Sensor ........................ 11  
Outline Dimensions....................................................................... 12  
Ordering Guide .......................................................................... 12  
REVISION HISTORY  
3/06—Rev. 0 to Rev. A  
Changes to Format .............................................................Universal  
Changes to Product Title, Features, and General Description... 1  
Changes to Table 1............................................................................ 3  
Changes to Table 2............................................................................ 4  
Added Figure 2 and Table 4............................................................. 4  
Changes to Figure 3.......................................................................... 5  
Changes to Figure 11 and Figure 14............................................... 7  
Changes to Table 7.......................................................................... 10  
4/05—Revision 0: Initial Version  
Rev. A | Page 2 of 12  
 
ADXL204  
SPECIFICATIONS  
All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.  
TA = –40°C to +125°C; VS = 3.3 V; CX = CY = 0.1 μF; acceleration = 0 g, unless otherwise noted.  
Table 1.  
Parameter  
Conditions  
Min  
Typ  
Max  
Unit  
SENSOR INPUT  
Measurement Range1  
Each axis  
±1.ꢀ  
g
Nonlinearity  
Package Alignment Error  
Alignment Error  
% of full scale  
±±.2  
±1  
±±.1  
±1.ꢁ  
±1.2ꢁ  
%
Degrees  
Degrees  
%
X sensor to Y sensor  
Cross Axis Sensitivity  
SENSITIVITY (RATIOMETRIC)2  
Sensitivity at XOUT, YOUT  
Sensitivity Change due to Temperature3  
ZERO g BIAS LEVEL (RATIOMETRIC)  
± g Voltage at XOUT, YOUT  
Initial ± g Output Deviation from Ideal  
± g Offset vs. Temperature  
NOISE PERFORMANCE  
Output Noise  
±3  
Each axis  
VS = 3.3 V  
VS = 3.3 V  
Each axis  
VS = 3.3 V  
VS = 3.3 V, 2ꢁ°C  
ꢁ9ꢁ  
62±  
±±.3  
64ꢁ  
mV/g  
%
1.ꢁꢁ  
1.6ꢁ  
±ꢁ±  
±±.1ꢁ  
1.ꢀꢁ  
±±.ꢂ  
3
V
mg  
mg/°C  
<4 kHz, VS = 3.3 V  
1
mV rms  
Noise Density  
1ꢀ±  
μg/√Hz rms  
FREQUENCY RESPONSE4  
CX, CY Rangeꢁ  
RFILT Tolerance  
Sensor Resonant Frequency  
SELF TEST6  
±.±±2  
24  
1±  
4±  
μF  
kΩ  
kHz  
32  
ꢁ.ꢁ  
Logic Input Low  
Logic Input High  
ST Input Resistance to Ground  
Output Change at XOUT, YOUT  
OUTPUT AMPLIFIER  
Output Swing Low  
±.66  
3±±  
3.1  
V
V
kΩ  
mV  
2.64  
3±  
1±±  
ꢁ±  
2±±  
Self test ± to 1  
No load  
No load  
±.±ꢁ  
3
±.2  
2.9  
V
V
Output Swing High  
POWER SUPPLY  
Operating Voltage Range  
Quiescent Supply Current  
Turn-On Timeꢀ  
6
±.9  
V
mA  
ms  
±.ꢁ  
2±  
1 Guaranteed by measurement of initial offset and sensitivity.  
2 Sensitivity is essentially ratiometric to VS. For VS = 3.± V to 3.6 V, sensitivity is typically 1ꢂꢁ mV/V/g to 19± mV/V/g.  
3 Defined as the change from ambient-to-maximum temperature or ambient-to-minimum temperature.  
4 Actual frequency response controlled by user-supplied external capacitor (CX, CY).  
Bandwidth = 1/(2 × π × 32 kΩ × C). For CX, CY = ±.±±2 μF, bandwidth = 2ꢁ±± Hz. For CX, CY = 1± μF, bandwidth = ±.ꢁ Hz. Minimum/maximum values are not tested.  
6 Self-test response changes cubically with VS.  
Larger values of CX, CY increase turn-on time. Turn-on time is approximately 16± × CX or CY + 4 ms, where CX, CY are in μF.  
Rev. A | Page 3 of 12  
 
ADXL204  
ABSOLUTE MAXIMUM RATINGS  
Table 2.  
Parameter  
Stresses above those listed under Absolute Maximum Ratings  
may cause permanent damage to the device. This is a stress  
rating only; functional operation of the device at these or any  
other conditions above those indicated in the operational  
section of this specification is not implied. Exposure to absolute  
maximum rating conditions for extended periods may affect  
device reliability.  
Rating  
Acceleration (Any Axis, Unpowered)  
Acceleration (Any Axis, Powered)  
Drop Test (Concrete Surface)  
VS  
3ꢁ±± g  
3ꢁ±± g  
1.2 m  
−±.3 V to +ꢀ.± V  
(COM − ±.3 V) to  
(VS + ±.3 V)  
All Other Pins  
Output Short-Circuit Duration  
(Any Pin to Common)  
Indefinite  
Table 3. Package Characteristics  
Package Type  
θJA  
θJC  
Device Weight  
Temperature Range (Powered)  
Temperature Range (Storage)  
−ꢁꢁ°C to +12ꢁ°C  
−6ꢁ°C to +1ꢁ±°C  
ꢂ-Terminal LCC  
12±°C/W  
2±°C/W  
<1.± gram  
CRITICAL ZONE  
TO T  
T
tP  
L
P
T
P
RAMP-UP  
T
L
tL  
T
SMAX  
T
SMIN  
tS  
RAMP-DOWN  
PREHEAT  
t
25°C TO PEAK  
TIME  
Figure 2. Recommended Soldering Profile  
Table 4.  
Condition  
Profile Feature  
Sn63/Pb37  
Pb-Free  
AVERAGE RAMP RATE (TL TO TP)  
PREHEAT  
3°C/sec maximum  
3°C/sec maximum  
Minimum Temperature (TSMIN  
)
1±±°C  
1ꢁ±°C  
Minimum Temperature (TSMAX  
Time (TSMIN to TSMAX) (tS)  
TSMAX TO TL  
)
1ꢁ±°C  
6± sec to 12± sec  
2±±°C  
6± sec to 1ꢁ± sec  
Ramp-Up Rate  
3°C/sec  
3°C/sec  
TIME MAINTAINED ABOVE LIQUIDOUS (TL)  
Liquidous Temperature (TL)  
Time (tL)  
1ꢂ3°C  
21ꢀ°C  
6± sec to 1ꢁ± sec  
24±°C +±°C/–ꢁ°C  
1± sec to 3± sec  
6°C/sec maximum  
6 minutes maximum  
6± sec to 1ꢁ± sec  
26±°C +±°C/–ꢁ°C  
2± sec to 4± sec  
6°C/sec maximum  
ꢂ minutes maximum  
PEAK TEMPERATURE (TP)  
TIME WITHIN ꢁ°C OF ACTUAL PEAK TEMPERATURE (tP)  
RAMP-DOWN RATE  
TIME 2ꢁ°C TO PEAK TEMPERATURE  
ESD CAUTION  
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4±±± 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.  
Rev. A | Page 4 of 12  
 
ADXL204  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS  
ADXL204E  
TOP VIEW  
(Not to Scale)  
V
S
8
ST  
DNC  
COM  
1
2
3
7
6
5
X
Y
OUT  
OUT  
+Y  
DNC  
+X  
4
DNC  
Figure 3. Pin Configuration  
Table 5. Pin Function Descriptions  
Pin No.  
Mnemonic  
Description  
1
2
3
4
6
ST  
Self Test  
Do Not Connect  
Common  
Do Not Connect  
Do Not Connect  
Y Channel Output  
X Channel Output  
3 V to 6 V  
DNC  
COM  
DNC  
DNC  
YOUT  
XOUT  
VS  
Rev. A | Page ꢁ of 12  
 
ADXL204  
TYPICAL PERFORMANCE CHARACTERISTICS  
VS = 3.3 V for all graphs, unless otherwise noted.  
35  
35  
30  
25  
20  
15  
10  
5
30  
25  
20  
15  
10  
5
0
0
VOLTS (V)  
VOLTS (V)  
Figure 4. X-Axis Zero g Bias Output at 25°C  
Figure 7. Y-Axis Zero g Bias Output at 25°C  
25  
20  
15  
10  
5
25  
20  
15  
10  
5
0
0
mg/°C  
mg/°C  
Figure 5. X-Axis Zero g Bias Temperature Coefficient  
Figure 8. Y-Axis Zero g Bias Temperature Coefficient  
60  
50  
40  
30  
20  
10  
0
70  
60  
50  
40  
30  
20  
10  
0
V/g  
V/g  
Figure 6. X-Axis Sensitivity at 25°C  
Figure 9. Y-Axis Sensitivity at 25°C  
Rev. A | Page 6 of 12  
 
ADXL204  
1.710  
0.65  
0.64  
0.63  
0.62  
0.61  
0.60  
0.58  
1.698  
1.686  
1.674  
1.662  
1.650  
1.638  
1.626  
1.614  
1.602  
1.590  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
Figure 10. Zero g Bias vs. Temperature—Parts Soldered to PCB  
Figure 13. Sensitivity vs. Temperature—Parts Soldered to PCB  
45  
40  
34  
30  
25  
20  
15  
10  
5
50  
45  
40  
34  
30  
25  
20  
15  
10  
5
0
0
120 130 140 150 160 170 180 190 200 210  
120 130 140 150 160 170 180 190 200 210  
µg/ Hz  
µg/ Hz  
Figure 11. X-Axis Noise Density at 25°C  
Figure 14. Y-Axis Noise Density at 25°C  
40  
35  
30  
25  
20  
15  
40  
35  
30  
25  
20  
15  
10  
5
10  
5
0
0
PERCENT SENSITIVITY (%)  
PERCENT SENSITIVITY (%)  
Figure 12. Z vs. X Cross-Axis Sensitivity  
Figure 15. Z vs. Y Cross-Axis Sensitivity  
Rev. A | Page ꢀ of 12  
 
ADXL204  
0.9  
0.8  
0.7  
0.6  
100  
90  
5V  
80  
V
= 5V  
S
3V  
70  
60  
50  
40  
30  
20  
0.5  
0.4  
V
= 3V  
S
10  
0
0.3  
–50  
0
50  
TEMPERATURE (°C)  
100  
150  
(µA)  
Figure 19. Supply Current at 25°C  
Figure 16. Supply Current vs. Temperature  
30  
35  
30  
25  
20  
15  
10  
5
25  
20  
15  
10  
5
0
0
VOLTS (V)  
VOLTS (V)  
Figure 20. Y-Axis Self-Test Response at 25°C  
Figure 17. X-Axis Self-Test Response at 25°C  
0.32  
0.29  
0.26  
0.23  
0.20  
0.17  
0.14  
0.11  
0.08  
TEMPERATURE (°C)  
Figure 18. Self-Test Response vs. Temperature  
Figure 21. Turn-On Time—CX, CY = 0.1 μF, Time Scale = 2 ms/DIV  
Rev. A | Page ꢂ of 12  
ADXL204  
THEORY OF OPERATION  
PIN 8  
X
Y
= 1.03V  
OUT  
OUT  
= 1.65V  
PIN 8  
= 1.65V  
= 2.27V  
PIN 8  
TOP VIEW  
(Not to Scale)  
X
Y
X
Y
= 1.65V  
= 1.03V  
OUT  
OUT  
OUT  
OUT  
X
Y
= 1.65V  
= 1.65V  
OUT  
OUT  
PIN 8  
X
Y
= 2.27V  
= 1.65V  
OUT  
OUT  
EARTH'S SURFACE  
Figure 22. Output Response vs. Orientation  
The ADXL204 is a complete acceleration measurement system on  
a single monolithic IC. The ADXL204 is a dual-axis accelerometer.  
It contains a polysilicon surface-micromachined sensor and  
signal conditioning circuitry to implement an open-loop  
acceleration measurement architecture. The output signals are  
analog voltages proportional to acceleration. The ADXL204 is  
capable of measuring both positive and negative accelerations to  
at least 1.7 g. The accelerometer can measure static acceleration  
forces, such as gravity, allowing it to be used as a tilt sensor.  
PERFORMANCE  
Rather than using additional temperature compensation  
circuitry, innovative design techniques have been used to ensure  
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 mg over the –40°C  
to +125°C temperature range.  
Figure 10 shows the zero g output performance of eight parts  
(X-axis and Y-axis) over a –40°C to +125°C temperature range.  
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 measured  
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. Acceleration  
deflects the beam and unbalances the differential capacitor,  
resulting in an output square wave whose amplitude is  
proportional to acceleration. Phase-sensitive demodulation  
techniques are then used to rectify the signal and determine  
the direction of the acceleration.  
Figure 13 demonstrates the typical sensitivity shift over tem-  
perature for VS = 3.3 V. Sensitivity stability is typically better  
than 1ꢀ over temperature.  
The output of the demodulator is amplified and brought off-  
chip through a 32 kΩ 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.  
Rev. A | Page 9 of 12  
 
ADXL204  
APPLICATIONS  
POWER SUPPLY DECOUPLING  
DESIGN TRADE-OFFS FOR SELECTING FILTER  
CHARACTERISTICS: THE NOISE/BW TRADE-OFF  
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  
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.  
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  
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 accelerometers bandwidth). The user  
should limit bandwidth to the lowest frequency needed by the  
application to maximize the resolution and dynamic range of  
the accelerometer.  
F
–3 dB = 1/(2π(32 kΩ) × C(X, Y)  
or more simply,  
–3 dB = 5 μF/C(X, Y)  
)
F
The tolerance of the internal resistor (RFILT) can vary typically as  
much as 25ꢀ 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.  
With the single-pole, roll-off characteristic, the typical noise of  
the ADXL204 is determined by  
rmsNoise = (170 μg/√Hz) × (√BW×1.6)  
Table 6. Filter Capacitor Selection, CX and CY  
At 100 Hz the noise is  
Bandwidth (Hz)  
Capacitor (μF)  
rmsNoise = (170 μg/√Hz) × (√BW×1.6) = 2.15 mg  
1
4.ꢀ  
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.  
1±  
ꢁ±  
1±±  
2±±  
ꢁ±±  
±.4ꢀ  
±.1±  
±.±ꢁ  
±.±2ꢀ  
±.±1  
Table 7. Estimation of Peak-to-Peak Noise  
% of Time Noise Exceeds  
Nominal Peak-to-Peak Value  
SELF TEST  
Peak-to-Peak Value  
2 × rms  
4 × rms  
6 × rms  
ꢂ × rms  
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.  
32  
4.6  
±.2ꢀ  
±.±±6  
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.  
Rev. A | Page 1± of 12  
 
 
ADXL204  
Peak-to-peak noise values give the best estimate of the uncertainty  
in a single measurement and is estimated by 6 × rms. Table 8  
gives the typical noise output of the ADXL204 for various CX  
and CY values.  
USING THE ADXL204 AS A DUAL-AXIS TILT SENSOR  
One of the most popular applications of the ADXL204 is tilt  
measurement. An accelerometer uses the force of gravity as an  
input vector to determine the orientation of an object in space.  
Table 8. Filter Capacitor Selection (CX, CY)  
An accelerometer is most sensitive to tilt when its sensitive  
axis is perpendicular to the force of gravity, that is, parallel to  
the earth’s surface. At this orientation, its sensitivity to changes  
in tilt is highest. When the accelerometer is oriented on axis to  
gravity, that is, near its +1 g or –1 g reading, the change in  
output acceleration per degree of tilt is negligible. When the  
accelerometer is perpendicular to gravity, its output changes  
nearly 17.5 mg per degree of tilt. At 45°, its output changes  
at only 12.2 mg per degree and resolution declines.  
CX, CY RMS Noise  
Peak-to-Peak Noise  
Estimate (mg)  
Bandwidth(Hz) (μF)  
(mg)  
1±  
ꢁ±  
±.4ꢀ  
±.1  
±.ꢀ  
1.ꢁ  
4.1  
9.1  
1±±  
ꢁ±±  
±.±4ꢀ 2.2  
±.±1 4.ꢂ  
12.9  
2ꢂ.ꢂ  
USING THE ADXL204 WITH OPERATING VOLTAGES  
OTHER THAN 3.3 V  
Dual-Axis Tilt Sensor: Converting Acceleration to Tilt  
The ADXL204 is tested and specified at VS = 3.3 V; however, it  
can be powered with VS as low as 3 V or as high as 6 V. Some  
performance parameters change as the supply voltage is varied.  
When the accelerometer is oriented, so both its x-axis and  
y-axis are parallel to the earths surface, it can be used as a 2-axis  
tilt sensor with a roll axis and a pitch axis. Once the output  
signal from the accelerometer is converted to an acceleration  
that varies between –1 g and +1 g, the output  
The ADXL204 output is ratiometric, so the output sensitivity, or  
scale factor, varies proportionally to supply voltage. At VS = 3 V,  
the output sensitivity is typically 560 mV/g. At VS = 5 V, the  
output sensitivity is typically 1000 mV/g.  
tilt in degrees is calculated as:  
PITCH = ASIN(AX/1 g)  
ROLL = ASIN(AY/1 g)  
The zero g bias output is also ratiometric, so the zero g output is  
nominally equal to VS/2 at all supply voltages.  
Be sure to account for overranges. It is possible for the  
accelerometers to output a signal greater than 1 g due to  
vibration, shock, or other accelerations.  
The output noise is not ratiometric but is absolute in volts;  
therefore, the noise density decreases as the supply voltage  
increases. This is because the scale factor (mV/g) increases  
while the noise voltage remains constant. At VS = 3 V, the noise  
density is typically 190 μg/√Hz. At VS = 5 V, the noise density is  
typically 110 μg/√Hz.  
Self-test response in g is roughly proportional to the square of  
the supply voltage. However, when ratiometricity of sensitivity  
is factored in with supply voltage, self-test response in volts is  
roughly proportional to the cube of the supply voltage. This  
means at VS = 3 V, the self-test response is approximately  
equivalent to 150 mV, or equivalent to 270 mg (typical). At  
VS = 5 V, the self-test response is approximately equivalent to  
750 mV, or equivalent to 750 mg (typical).  
The supply current decreases as the supply voltage decreases.  
Typical current consumption at VDD = 5 V is 750 μA.  
Rev. A | Page 11 of 12  
 
 
ADXL204  
OUTLINE DIMENSIONS  
1.27  
7
5.00  
SQ  
0.50 DIAMETER  
1.78  
1
3
1.27  
1.90  
2.50  
4.50  
SQ  
TOP VIEW  
0.64  
2.50  
1.27  
5
0.20  
0.38 DIAMETER  
BOTTOM VIEW  
R 0.38  
R 0.20  
Figure 23. 8-Terminal Ceramic Leadless Chip Carrier [LCC]  
(E-8)  
Dimensions shown in millimeters  
ORDERING GUIDE  
Specified  
Number of Axes Voltage (V) Temperature Range Package Description  
Package  
Option  
Model  
ADXL2±4CE  
ADXL2±4CE-REEL  
ADXL2±4EB  
2
2
3.3  
3.3  
–4±°C to +12ꢁ°C  
–4±°C to +12ꢁ°C  
ꢂ-Terminal Ceramic Leadless Chip Carrier (LCC)  
ꢂ-Terminal Ceramic Leadless Chip Carrier (LCC)  
Evaluation Board  
E-ꢂ  
E-ꢂ  
©2006 Analog Devices, Inc. All rights reserved. Trademarks and  
registered trademarks are the property of their respective owners.  
D05512-0-3/06(A)  
Rev. A | Page 12 of 12  
 

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