DAC8531 Datasheet, PDF (15/19 Pages) Texas Instruments – Low-Power, Rail-to-Rail Output, 16-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER

The power applied to V_DD 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, V_DD 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 1µF to 10µF and 0.1µF
bypass capacitors are strongly recommended. In some situ-
ations, additional bypassing may be required, such as a
100µF 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.
V_REF
R₁
10kΩ
10µF
0.1µF
V_REF
DAC8531
V_FB
V_OUT
R₂
10kΩ
+5V
OPA703
±5V
–5V
Three-Wire
Serial
Interface
FIGURE 10. Bipolar Operation with the DAC8531.
DAC8531
15
SBAS192B
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