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參數(shù)資料
| 型號(hào)： | MXR2312G |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Improved, Ultra Low Noise 【2 g Dual Axis Accelerometer with Ratiometric Outputs |
| 中文描述： | 改進(jìn)的，超低噪音【2克雙軸加速度計(jì)成比例輸出 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 428K |
| 代理商： | MXR2312G |
The peak-to-peak noise is approximately equal to 6.6 times
the rms value (for an average uncertainty of 0.1%).
EXTERNAL FILTERS
AC Coupling
: For applications where only dynamic
accelerations (vibration) are to be measured, it is
recommended to ac couple the accelerometer output as
shown in Figure 3. The advantage of ac coupling is that
variations from part to part of zero
g
offset and zero
g
offset versus temperature can be eliminated. Figure 3 is a
HPF (high pass filter) with a –3dB breakpoint given by the
equation:
RC
π
2
desirable to have the HPF –3dB point at a very low
frequency in order to detect very low frequency
accelerations. Sometimes the implementation of this HPF
may result in unreasonably large capacitors, and the
designer must turn to digital implementations of HPFs
where very low frequency –3dB breakpoints can be
achieved.
MEMSIC MXR2312G/M Rev.E
Page 5 of 6
1/19/2005
A
OUTX
R
C
A
OUTY
R
C
A
OUTX
Filtered
Output
A
OUTY
Filtered
Output
f
1
=
. In many applications it may be
Figure 3: High Pass Filter
Low Pass Filter
: An external low pass filter is useful in
low frequency applications such as tilt or inclination. The
low pass filter limits the noise floor and improves the
resolution of the accelerometer
. When designing with
MEMSIC ratiometric output accelerometers (MXRxxxx
series), it is highly recommended that an external, 20 Hz
low pass filter be used to eliminate internally generated
periodic noise that is coupled to the output of the
accelerometer.
The low pass filter shown in Figure 4 has a
–3dB breakpoint given by the equation:
RC
π
2
f
1
=
. For
the 200 Hz ratiometric output device filter, C=0.2
μ
F and
R=39k
,
±
5%, 1/8W.
A
OUTX
R
C
A
OUTY
R
C
A
OUTX
Filtered
Output
A
OUTY
Filtered
Output
Figure 4: Low Pass Filter
POWER SUPPLY NOISE REJECTION
Two capacitors and a resistor are recommended for best
rejection of power supply noise (reference Figure 5 below).
The capacitors should be located as close as possible to the
device supply pins (V
DA
, V
DD
). The capacitor lead length
should be as short as possible, and surface mount capacitors
are preferred. For typical applications, capacitors C1 and
C2 can be ceramic 0.1 μF, and the resistor R can be 10
.
R
MEMSIC
Accelerometer
VDA
C1
C2
VDD
V SUPPLY
Figure 5: Power Supply Noise Rejection
PCB LAYOUT AND FABRICATION SUGGESTIONS
1. The Sck pin should be grounded to minimize noise.
2. Liberal use of ceramic bypass capacitors is
recommended.
3. Robust low inductance ground wiring should be used.
4. Care should be taken to ensure there is “thermal
symmetry” on the PCB immediately surrounding the
MEMSIC device and that there is no significant heat
source nearby.
5. A metal ground plane should be added directly beneath
the MEMSIC device. The size of the plane should be
similar to the MEMSIC device’s footprint and be as
thick as possible.
6. Vias can be added symmetrically around the ground
plane. Vias increase thermal isolation of the device
from the rest of the PCB.
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