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ADS5545 Datasheet(PDF) 44 Page - Texas Instruments

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Part No. ADS5545
Description  11-BIT, 200 MSPS ADC
Download  54 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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ADS5545 Datasheet(HTML) 44 Page - Texas Instruments

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Board Design Considerations
Grounding
Supply Decoupling
Series Resistors on Data Outputs
Exposed Thermal Pad
ADS5517
SLWS203 – DECEMBER 2007
A single ground plane is sufficient to give good performance, provided the analog, digital and clock sections of
the board are cleanly partitioned. See the EVM User Guide (SLWU028) for details on layout and grounding.
As the ADS5517 already includes internal decoupling, minimal external decoupling can be used without loss in
performance. Note that decoupling capacitors can help to filter external power supply noise, so the optimum
number of capacitors would depend on the actual application. The decoupling capacitors should be placed close
to the converter supply pins.
It is recommended to use separate supplies for the analog and digital supply pins to isolate digital switching
noise from sensitive analog circuitry. If only a single 3.3V supply is available, it should be routed first to AVDD. It
can then be tapped and isolated with a ferrite bead (or inductor) with decoupling capacitor, before being routed to
DRVDD.
It is recommended to put series resistors (50 to 100
Ω) on each output line placed close to the converter pins.
This helps to isolate the outputs from seeing large load capacitances and in turn reduces the amount of switching
noise.
It is necessary to solder the exposed pad at the bottom of the package to a ground plane for best thermal
performance. For detailed information, see application notes QFN Layout Guidelines (SLOA122) and QFN/SON
PCB Attachment (SLUA271).
44
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS5517


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