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AD9985A
OUTPUTS (BOTH DATA AND CLOCKS)
Try to minimize the trace length that the digital outputs have to
drive. Longer traces have higher capacitance, which requires
more current, which causes more internal digital noise. Shorter
traces reduce the possibility of reflections.
Adding a series resistor of value 22 Ω to 100 Ω can suppress
reflections, reduce EMI, and reduce the current spikes inside of
the AD9985A. However, if 50 Ω traces are used on the PCB, the
data outputs should not need resistors. A 22 Ω resistor on the
DATACK output should provide good impedance matching
that reduces reflections. If series resistors are used, place them
as close as possible to the AD9985A pins (but try not to add vias
DIGITAL INPUTS
The digital inputs on the AD9985A were designed to work with
3.3 V signals, but are tolerant of 5.0 V signals. Therefore, no
extra components need to be added if using 5.0 V logic.
Any noise that gets onto the Hsync input trace adds jitter to the
system. Therefore, minimize the trace length and do not run
any digital or other high frequency traces near it.
VOLTAGE REFERENCE
Bypass the voltage reference with a 0.1 μF capacitor. Place it as
close as possible to the AD9985A pin. Make the ground
connection as short as possible.
or extra length to the output trace in order to get the resistors
closer).
If possible, limit the capacitance that each of the digital outputs
drives to less than 10 pF. This can easily be accomplished by
keeping traces short and by connecting the outputs to only one
device. Loading the outputs with excessive capacitance increases
the current transients inside of the AD9985A, creating more
digital noise on its power supplies.
Rev. 0 | Page 30 of 32
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