mxd2020g ETC-unknow, mxd2020g Datasheet - Page 6

• Manufacturer Part Number: mxd2020g
• Description: Improved, Ultra Noise Dual Axis Accelerometer With Digital Outputs
• Manufacturer: ETC-unknow

Figure 3: Converting the digital output to an analog voltage
POWER SUPPLY NOISE REJECTION
Two capacitors and a resistor are recommended for best
rejection of power supply noise (reference Figure 4 below).
The capacitors should be located as close as possible to the
device supply pins (V
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 Ω.
Figure 4: Power Supply Noise Rejection
MEMSIC MXD2020G/M/N/H Rev.E
MEMSIC
Accel.
C1
V SUPPLY
DOUT
10K
VDA
MEMSIC
Accelerometer
1uF
R
DA
VDD
, V
DD
AOUT
C2
). The capacitor lead length
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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 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.
3/25/2005