DAC7513

16

SBAS157A

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noise. Switching power supplies and DC/DC converters will

often have high-frequency glitches or spikes riding on the

output voltage. In addition, digital components can create

similar high-frequency spikes as their internal logic switches

states; this noise can easily couple into the DAC output

voltage through various paths between the power connec-

tions and analog output. This is only true for the DAC7513 if

the power supply is also opted to be used as the source of

reference voltage for the DAC.

+5V power-supply plane or trace that is separate from the

connection for digital logic until they are connected at the

power-entry point. In addition, the 1

µF to 10µF and 0.1µF

bypass capacitors are strongly recommended. In some situ-

ations, additional bypassing may be required, such as a

100

µF electrolytic capacitor or even a Pi filter made up of

inductors and capacitors—all designed to essentially low-

pass filter the +5V supply, removing the high-frequency

noise.