Datasheet

DAC2904
SBAS198C –AUGUST 2001–REVISED OCTOBER 2009.............................................................................................................................................. www.ti.com
planes must be confined to areas covering digital connected together at the supply connector of the
circuitry, including the digital input lines connecting to PCB. In the case of only one supply voltage being
the converter, as well as the clock signal. The analog available to power the DAC, ferrite beads along with
and digital ground planes should be joined together at bypass capacitors may be used to create an LC filter.
one point underneath the DAC. This can be realized This will generate a low-noise analog supply voltage,
with a short track of approximately 1/8 inch (3,0 mm). which can then be connected to the +V
A
supply pin of
the DAC2904.
The power to the DAC2904 should be provided
through the use of wide PCB runs or planes. Wide While designing the layout, it is important to keep the
runs will present a lower trace impedance, further analog signal traces separated from any digital line,
optimizing the supply decoupling. The analog and in order to prevent noise coupling onto the analog
digital supplies for the converter should only be signal path.
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