mxd2020e memsic, mxd2020e Datasheet - Page 7

• Manufacturer Part Number: mxd2020e
• Description: Ultra Low Noise, Low Offset Drift ?1 G Dual Axis Accelerometer With Digital Outputs
• Manufacturer: memsic

TEMPERATURE OUTPUT NOISE REDUCTION
It is recommended that a simple RC low pass filter is used
when measuring the temperature output. Temperature
output is typically a very slow changing signal, so a very
low frequency filter eliminates erroneous readings that may
result from the presence of higher frequency noise. A
simple filter is shown in Figure 6.
Figure 6: Temperature Output Noise Reduction
POWER SUPPLY NOISE REJECTION
One capacitor is recommended for best rejection of power
supply noise (reference Figure 7 below). The capacitor
should be located as close as possible to the device supply
pin (V
possible, and surface mount capacitor is preferred. For
typical applications, the capacitor can be ceramic 0.1 μF.
MEMSIC MXD2020E/F Rev H
MEMSIC
Accel.
TOUT
DD
). The capacitor lead length should be as short as
8.2K
0.1uF
Filtered TOUT
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PCB LAYOUT AND FABRICATION SUGGESTIONS
1. The Sck pin should be grounded to minimize noise.
2. Liberal use of ceramic bypass capacitors is
3. Robust low inductance ground wiring should be used.
4. Care should be taken to ensure there is “thermal
5. A metal ground plane should be added directly beneath
6. Vias can be added symmetrically around the ground
recommended.
symmetry” on the PCB immediately surrounding the
MEMSIC device and that there is no significant heat
source nearby.
the MEMSIC device. The size of the ground plane
should be similar to the MEMSIC device’s footprint
and be as thick as possible.
plane. Vias increase thermal isolation of the device
from the rest of the PCB.
Figure 7: Power Supply Noise Rejection
0.1uF
C1
Power Supply
Accelerometer
VDA
MEMSIC
VDD
2/26/2007