ADIS16203SLASHPCBZ datasheet(24/28 Pages) AD

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ADIS16203

Rev. 0 | Page 24 of 28

APPLICATIONS

HARDWARE CONSIDERATIONS

The ADIS16203 can be operated from a single 3.3 V (3.0 V to 3.6 V)

power supply. The ADIS16203 integrates two decoupling capacitors

that are 1 μF and 0.1 μF in value. For the local operation of the

ADIS16203, no additional power supply decoupling capacitance is

required.

However, if the system power supply presents a substantial amount

of noise, additional filtering may be required. If additional capacitors

are required, connect the ground terminal of each capacitor directly

to the underlying ground plane. Finally, note that all analog and

digital grounds should be referenced to the same system ground

reference point.

GROUNDING AND BOARD LAYOUT

RECOMMENDATIONS

Maintaining low impedance signal return paths can be very critical

in managing system-level noise effects. For best results, use a single,

continuous ground plane that is tied to each ADIS16203 ground pin

via short trace lengths. In addition to maintaining a low impedance

ground structure, routing the SPI signals away from sensitive analog

circuits, such as the ADC and DACs (if they are in use), can help

mitigate system-level noise risks.

SELF-TEST TIPS

When using the ADIS16203’s self-test function to monitor

incline angles around 0°, using the INCL_180_OUT register is

more convenient than using the INCL_OUT register. Because

the measurements in the INCL_OUT register jump from 0 to

359.975, they may trigger false alarms. The same philosophy

can be applied to monitoring conditions around 180°. Because

the INCL_OUT provides continuous measurements through

180° and the INCL_180_OUT abruptly changes from −180° to

+180°, the INCL_OUT register is a more convenient choice.

BAND GAP REFERENCE

The ADIS16203 provides an on-chip band gap reference of

2.5 V that is utilized by the on-board ADC and DAC. This

internal reference also appears on the VREF pin. This reference

can be connected to external circuits in the system. An external

buffer would be required because of the low drive capability of

the VREF output.

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