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Spin/Vibration Control
GENERAL DESCRIPTION
The MXA2500U is an ultra low noise and low cost, dual
axis accelerometer fabricated on a standard, submicron
CMOS process. It is a complete sensing system with on-
chip mixed mode signal processing. The MXA2500U
measures acceleration with a full-scale range of
鹵1
g
and a
sensitivity of 500mV/g at 25擄C. (The MEMSIC
accelerometer product line extends from
鹵1
g
to
鹵10
g
with
custom versions available above
鹵10
g.)
It can measure
both dynamic acceleration (e.g., vibration) and static
acceleration (e.g., gravity). The MXA2500U design is
based on heat convection and requires no solid proof mass.
This eliminates stiction and particle problems associated
with competitive devices and provides shock survival of
50,000
g,
leading to significantly lower failure rates and
lower loss due to handling during assembly.
Sck
(optional)
Internal
Oscillator
Temperature
Sensor
Voltage
Reference
Continous
Self Test
T
OUT
V
REF
CLK
Heater
Control
X axis
Low Pass
Filter
A
OUTX
Factory Adjust
Offset & Gain
Low Pass
Filter
Y axis
2-AXIS
SENSOR
A
OUTY
V
DD
Gnd
V
DA
MXA2500U FUNCTIONAL BLOCK DIAGRAM
The MXA2500U provides an absolute analog output
The
typical noise floor is 0.2 mg/
Hz
allowing signals below
1 milli-g to be resolved at 1 Hz bandwidth.
The 3dB
rolloff of the device occurs at 25 Hz but is expandable to
>160 Hz (ref. Application Note AN-00MX-003). The
MXA2500U is available in a low profile LCC surface
mount package (5 mm x 5 mm x 2 mm). It is hermetically
sealed and is operational over a -40擄C to +105擄C
temperature range. It also contains an on-chip temperature
sensor and a bandgap voltage reference.
Due to the standard CMOS structure of the MXA2500U,
additional circuitry can easily be incorporated into custom
versions for high volume applications. Contact the factory
for more information.
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.
餂橫EMSIC,
Inc.
800 Turnpike Street, Suite 202 , North Andover, MA 01845
Tel: 978.738.0900
Fax: 978.738.0196
www.memsic.com
MEMSIC MXA2500U Rev A
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