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some caps not found

Tim Baker
Intellectual 540 points
Other Parts Discussed in Thread: CDCE913

Hello,

CDCE913 datasheet SCAS849F has layout example with many unknown capacitors and resistors. Particularly upper right R26 cannot be inferred from pin positions, and they do not match to datasheet schematics. Please provide corresponding schematic.

 

Tim

  • 0
    TI__Genius 10320 points
    Hi Tim,

    The layout example in the DS is only as a guideline for the 4 critical component placement. Please see the CDCE9xx Performance EVM User's guide for a typical schematic (www.ti.com/.../scau022a.pdf)

    Gabe
  • 0 in reply to Gabe Ayala
    Intellectual 540 points

    we do have looked at scau022a but the designators not match. Does the DS designator have any corresponding schematic?

  • 0 in reply to Tim Baker
    TI__Genius 10320 points

    Hi Tim,


    I couldn't quickly find where this was pulled from. I've done a quick comparison for you though and it should help identify most of the critical component placement.

    Group DS Desig. EVM Desig. Notes
    XTAL (1) C258 C1 depends on selected XTAL
    C259 C2
    R168 R1 not always required
    Y6 Y1
    Power Supply Decoupling (3) (4) C252 C51 1 uF
    C253 C53 10 nF
    C254 C54 0.1 uF
    C255 C66 1 uF
    C256 C68 0.1 uF
    C257 C67 10 nF
    L13 L6 50 ohm @ 100 MHz
    L14 L8 50 ohm @ 100 MHz
    Vctr R166 R6 maybe required
    Series Termination (2) R182 R75 Vddout dependent values
    R183 R29
    R167 R61

    Gabe