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參數資料
| 型號： | MXA2500U |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Ultra Low Noise, 1g Dual Axis Accelerometer with Analog Outputs |
| 中文描述： | 超低噪音，1克雙軸加速度計的模擬輸出 |
| 文件頁數： | 8/8頁 |
| 文件大?。?/td> | 321K |
| 代理商： | MXA2500U |
POWER SUPPLY NOISE REJECTION
Two capacitors and a resistor are recommended for best
rejection of power supply noise (reference Figure 9 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
.
In 5V applications where power consumption is not a
concern, maximum supply noise rejection can be obtained
by significantly increasing the values of C1, C2 and R. For
example, C1 = C2 = 0.47 μF and R = 270
will virtually
eliminate power supply noise effects.
MEMSIC MXA2500U Rev A
Page 8 of 8
05/02
R
MEMSIC
Accelerometer
VDA
C1
C2
VDD
V SUPPLY
Figure 9: Power Supply Noise Rejection
PACKAGE DRAWING
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 ground 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.
Fig 10: Hermetically Sealed Package Outline
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