MSP432P401R Datasheet, PDF (143/157 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP432P401R, MSP432P401M
SLAS826B – MARCH 2015 – REVISED FEBRUARY 2016
The reference voltage must be a stable voltage for accurate measurements. The capacitor values that are
selected in the general guidelines filter out the high- and low-frequency ripple before the reference voltage
enters the device. In this case, the 5-µF capacitor is used to buffer the reference pin and filter any low-
frequency ripple. A 50-nF bypass capacitor is used to filter out any high-frequency noise.
7.2.1.3 Layout Guidelines
Component that are shown in the partial schematic (see Figure 7-3) should be placed as close as possible
to the respective device pins. Avoid long traces, because they add additional parasitic capacitance,
inductance, and resistance on the signal.
Avoid routing analog input signals close to a high-frequency pin (for example, a high-frequency PWM),
because the high-frequency switching can be coupled into the analog signal.
If differential mode is used for the ADC14, the analog differential input signals must be routed closely
together to minimize the effect of noise on the resulting signal.
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Applications, Implementation, and Layout 143
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