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MXR7900A Datasheet Preview

MXR7900A Datasheet

Dual Axis Accelerometer

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MXR7900A pdf
Low Cost, High Performance
±1.0 g Dual-Axis Accelerometer
with Ratiometric Outputs
MXR7900A/C/DF
FEATURES
Dual axis accelerometer fabricated on a single CMOS IC
Monolithic design with mixed mode signal processing
RoHS compliant
On-chip sensitivity compensation for temperature variations
On Demand Self Test
900mV/g sensitivity
Independent axis programmability (special order)
Resolution better than 1mg
19Hz bandwidth
>50,000 g shock survival rating
4.50V to 5.25V single supply operation
Small surface mount package, 5mm x 5mm x 2mm
APPLICATION
Automotive – Roll over sensing, VSC/EPB application
VDD
TEMP
CLK
Internal
Oscillator
Temperature
Vref Sensor
CLK CLK
STin
Heater
Control
Coarse Fine Gain
Gain Adj. Adj.
TEMP
Vref
X axis
Temp
Comp.
A/D
D/A
Low Pass
Filter
Buf.
CLK CLK TEMP CLK CLK
Coarse Fine Gain
Gain Adj. Adj.
Vref
CLK
Y axis
Acceleration
Sensor
Temp
Comp.
A/D
D/A
Low Pass
Filter
Buf.
CLK CLKTEMP CLK CLK CLK
GND
No
Connection
Xout
No
Connection
Yout
MXR7900A/C/D FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The MXR7900A/C/DF is a low cost, dual axis
accelerometer built on a standard, submicron CMOS
process. It measures acceleration with a sensitivity of
900mV/g.
The MXR7900A/C/DF provides a g-proportional
ratiometric analog output above/below the zero-g point at
50% of the supply voltage.
(Ref. other MEMSIC datasheets for absolute analog or
digital outputs).
The typical noise floor is 0.3mg / Hz , allowing signals
below 1mg to be resolved at 1Hz bandwidth. The 3dB roll-
off of the device occurs at 17Hz.
The MXR7900A/C/D is available in a low profile LCC
surface mount package (5mm x 5mm 2mm). It is
hermetically sealed and operational over a -30°C to +105°C
temperature range.
It can measure both dynamic acceleration (e.g., vibration)
and static acceleration (e.g., gravity).
The design is based on heat convection and requires no
solid proof mass. This eliminates stiction and particle
problems associated with competitive devices and provide
shock survival greater than 50,000 g, leading to
significantly lower failure rates and lower loss due to
handling during assembly and at customer field application.
Information furnished by MEMSIC is believed to be accurate and reliable.
However, no responsibility is assumed by MEMSIC for its use, nor for any
infringements of patents or other rights of third parties, which may result from
its use. No license is granted by implication or otherwise under any patent or
patent rights of MEMSIC.
Due to the standard CMOS structure of the
MXR7900A/C/D, additional circuitry can easily be
incorporated into custom versions for high volume
applications. Contact Memsic’s local office for more
information.
©MEMSIC, Inc.
One Technology Drive, Suite 325, Andover, MA01810, USA
Tel: +1 978 738 0900
Fax: +1 978 738 0196
www.memsic.com
MEMSIC MXR7900A/C/D Rev.A
Page 1 of 6
4/09/2009



MEMSIC
MEMSIC

MXR7900A Datasheet Preview

MXR7900A Datasheet

Dual Axis Accelerometer

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MXR7900A pdf
MXR7900A/C/D SPECIFICATIONS (Measurements @ 25°C, Acceleration = 0 g unless otherwise noted; VDD = 5.0V unless otherwise
specified)
MXR7900A/C/D
Parameter
Conditions
Min.
Typ.
Max.
Units
SENSOR INPUT
Measurement Range1
MXR7900A/C
MXR7900D
±1.0
±1.7
g
g
Nonlinearity
Alignment Error2
Best fit straight line
0.5 1.0 % of FS
±1.0 ±3.0 degrees
Alignment Error
Cross Axis Sensitivity3
X Sensor to Y Sensor
0.01 degrees
±0.5 ±1.0 %
SENSITIVITY
Each Axis
Sensitivity Xout, Yout
VDD=5.0V
855 900 945 mV/g
Sensitivity Change over
MXR7900A/C
-60%
100%
%
Temperature4 Delta from 25°C
MXR7900D
-6%
3% %
ZERO g BIAS LEVEL
Each Axis
0 g Voltage Xout, Yout
0 g Voltage Xout, Yout
0 g Offset vs. Temperature4
VDD=5.0V
2.41 2.50 2.59 V
VDD=5.0V
-0.10
0.00
0.10
g
MXR7900A
0.4 1.0 mg/°C
Delta from 25°C
MXR7900C
0.1 0.3 mg/°C
MXR7900D
0.4 1.0 mg/°C
NOISE PERFORMANCE
Noise Density, rms
@25°C
0.3 0.8 mg/ Hz
FREQUENCY RESPONSE
3dB Bandwidth
17 19 21 Hz
Selftest
Delta output change at Xout and Yout
-1.0 g
POWER SUPPLY
Operating Voltage Range
4.50 5.25 V
Quiescent Supply Current
Xout and Yout OUTPUTS
@5.0V
4.0 5.5 mA
Output High Voltage
@5.0V Supply
4.5
V
Output Low Voltage
0.5 V
Current
Turn-On Time5
Source or sink @4.5V-
5.25V Supply
100 uA
160 200 mS
TEMPERATURE RANGE
Operating Range
-30
+105
°C
NOTES
1 Guaranteed by measurement of initial offset and sensitivity.
2 Alignment error is specified as the angle between the true and indicated axis of
sensitivity.
3 Cross axis sensitivity is the algebraic sum of the alignment and the inherent
sensitivity errors.
4 Defined as the output change from ambient to maximum temperature or ambient to
minimum temperature.
5 Output settled to within ±17mg.
MEMSIC MXR7900A/C/D Rev.A
Page 2 of 6
4/09/2009


Part Number MXR7900A
Description Dual Axis Accelerometer
Maker MEMSIC
Total Page 6 Pages
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