DAC707SH datasheet(15/27 Pages) TI

15 / 27 page

DAC8531

SBAS192B

www.ti.com

FIGURE 10. Bipolar Operation with the DAC8531.

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.

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.

DAC8531

REF

OUT

10k

Ω

10k

Ω

Three-Wire

Serial

Interface

REF

µF

0.1

µF

–5V

±5V

+5V

OPA703

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