DAC8560A BURR-BROWN [Burr-Brown Corporation], DAC8560A Datasheet - Page 25

• Manufacturer Part Number: DAC8560A
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

LAYOUT
A precision analog component requires careful
layout,
well-regulated power supplies.
The DAC8560 offers single-supply operation, and it
often is used in close proximity with digital logic,
microcontrollers, microprocessors, and digital signal
processors. The more digital logic present in the
design and the higher the switching speed, the more
difficult it is to keep digital noise from appearing at
the output.
As a result of the single ground pin of the DAC8560,
all return currents, including digital and analog return
currents for the DAC, must flow through a single
point. Ideally, GND would be connected directly to an
analog ground plane. This plane would be separate
from
components until they were connected at the
power-entry point of the system.
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the
adequate
ground
connection
bypassing,
for
and
the
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clean,
digital
The power applied to V
and low noise. Switching power supplies and DC/DC
converters 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 connections and
analog output.
As with the GND connection, V
connected to a 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, a 1 F to 10 F capacitor and 0.1 F bypass
capacitor are strongly recommended. In some
situations, additional bypassing may be required,
such as a 100 F electrolytic capacitor or even a Pi
filter made up of inductors and capacitors – all
designed to essentially low-pass filter the supply,
removing the high-frequency noise.
DD
should be well regulated
SLAS464 – DECEMBER 2006
DD
DAC8560
should be
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