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AD9689-2000EBZ Datasheet(PDF) 133 Page - Analog Devices

Part # AD9689-2000EBZ
Description  Dual Analog-to-Digital Converter
PDF  134 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9689-2000EBZ Datasheet(HTML) 133 Page - Analog Devices

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Data Sheet
AD9689
Rev. A | Page 133 of 134
LAYOUT GUIDELINES
The ADC evaluation board can be used as a guide to follow
good layout practices. The evaluation board layout is set up in
such a way as to
•
Minimize coupling between the analog inputs (Channel A
to Channel B and Channel B to Channel A).
•
Minimize clock coupling to the analog inputs.
•
Provide enough power and ground planes for the various
supply domains while reducing cross coupling.
•
Provide adequate thermal relief to the ADC.
Figure 159 shows the overall layout scheme used for the
AD9689 evaluation boards.
AVDD1_SR (PIN E7) AND AGND (PIN E6 AND PIN E8)
Use AVDD1_SR (Pin E7) and AGND (Pin E6 and Pin E8) to
provide a separate power supply node to the SYSREF± circuits
of the AD9689. If running in Subclass 1, the AD9689 can
support periodic one-shot or gapped signals. To minimize the
coupling of this supply into the AVDD1 supply node, adequate
supply bypassing is needed.
ADC
CH.A
CH.B
CLK±
JESD204B LANES
POWER
Figure 159. Recommended PCB Layout for the AD9689



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