MXD7210GL datasheet(6/10 Pages) ETC | Low Cost, Low Noise +-10 g Dual Axis Accelerometer with Digital Outputs

6 page

MEMSIC MXD7210GL/HL/ML/NL

Page 6 of 10

2003.08.04

POWER SUPPLY NOISE REJECTION

One capacitor is recommended for best rejection of power

supply noise (reference Figure 5 below). The capacitor

should be located as close as possible to the device supply

pin (VDD). The capacitor lead length should be as short as

possible, and surface mount capacitor is preferred. For

typical applications, the capacitor can be ceramic 0.1 µF.

PCB LAYOUT AND FABRICATION SUGGESTIONS

1. Liberal use of ceramic bypass capacitors is

recommended.

2. Robust low inductance ground wiring should be used.

3. 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.

4. 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.

5. Vias can be added symmetrically around the ground

plane. Vias increase thermal isolation of the device

from the rest of the PCB.

Figure 5: Power Supply Noise Rejection

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