Linear Technology DC1649A Demo Manual
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Linear Technology DC1649A Demo Manual

Ltc6945 ultralow noise and spurious integer-n synthesizer
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DESCRIPTION
Demonstration circuit 1649A features the LTC
ultralow noise and spurious integer-N synthesizer.
DC1649A provides 50Ω SMA connectors for the reference
frequency (REF+), the reference output buffer (REFO),
and the two single-ended RF outputs (RF+ and RF–).
Arrow.com.
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DEMO MANUAL DC1649A
Ultralow Noise and Spurious
Demonstration circuit 590 is used for SPI communication
with the LTC6945, controlled by the supplied PLLWizard™
®
6945, an
software.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PLLWizard and QuikEval are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Figure 1. DC1649A Inputs and Outputs
Integer-N Synthesizer
LTC6945
dc1649afa
1

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Summary of Contents for Linear Technology DC1649A

  • Page 1 (REF+), the reference output buffer (REFO), and the two single-ended RF outputs (RF+ and RF–). L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PLLWizard and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    Set by Loop Filter Component Values 7kHz* *These frequencies are for the “DC1649A-10MHz.pllset “or” DC1649A-100MHz.pllset” files and included VCO. Note 1: A low noise 10MHz or 100MHz reference frequency, such as the Ref BST and FILT under the System tab in PLLWizard might need to be Wenzel 501-04608A or 501-04516D OCXO, is recommended.
  • Page 3 .NET if a compatible .NET version is not found. But, the installation source depends upon which file you down- Linear Technology’s QuikEval and DC590 hardware loaded from Linear Technology’s website. You should pick one of the following two choices, depending upon your Microsoft .NET version of .NET.
  • Page 4 Figure 1 and the Typical DC1649A Requirements and much larger). Characteristics table). The setup file will verify and/or install Microsoft .NET and 4. Connect the DC590 to the DC1649A with the provided install PLLWizard. Refer to the Help menu for software ribbon cable. operation.
  • Page 5 DEMO MANUAL DC1649A DC1649A RECONFIGURATION DC1649A is flexible and allows the use of a variety of VCOs drive the LTC6945 through J5. Table 2 gives options to and the choice to employ either an active or passive loop customize the DC1649’s VCOs. When using an active loop filter.

  • Page 6: Parts List

    DEMO MANUAL DC1649A PARTS LIST Number of Boards = 325 ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CI1_P , CI1_A, C27, C32, CP_A Opt., 0603 CI2_A Opt., 1206 CI2_P Cap., C0G, 0.1μF , 50V, 5%, 1206 Murata, GRM31C5C1H104JA01L CP_P Cap., X7R, 8200pF , 50V, 10%, 0603...

  • Page 7: Schematic Diagram

    DEMO MANUAL DC1649A SCHEMATIC DIAGRAM dc1649afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 8 DEMO MANUAL DC1649A SCHEMATIC DIAGRAM Note: The buffers shown on sheet 2 of 2 of the schematic are used to powering up the LTC6945. The EEPROM is for identification and is not protect the LTC6945 when communicating to it starts before powering it needed to program the LTC6945.

  • Page 9: Layout Top Layer

    DEMO MANUAL DC1649A LAYOUT TOP LAYER The top metal layer of DC1649A is shown here as an example of good PCB layout for the LTC6945. dc1649afa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 10 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.

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Dc1649a-a

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