DAC7513 datasheet(16/18 Pages) TI

16 / 18 page

DAC7513

SBAS157A

www.ti.com

The power applied to VDD should be well regulated and low

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.

As with the GND connection, VDD should be connected to a

+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.

DAC7513 Datasheet(PDF) 16 Page - Texas Instruments