Linear Technology DC1959B Demo Manual
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Linear Technology DC1959B Demo Manual

Ltc6948 ultralow noise and spurious fractional-n synthesizer with integrated vco
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Description
Demonstration circuit 1959B features the LTC6948, an
Ultralow Noise and Spurious Fractional-N Synthesizer
with Integrated VCO.
There are four options of the DC1959B, one for each ver-
sion of the LTC6948. Table 1 summarizes the available
DC1959B options.
The DC1959B provides 50Ω SMA connectors for the ref-
erence frequency input f
RF output (RF+ and RF–).
RIBBON CABLE
CONNECTION
TO DC590
3.3V DC SUPPLY,
Arrow.com.
Downloaded from
Ultralow Noise and Spurious Fractional-N
(REF+IN) and the differential
REF
FREQUENCY
REFERENCE
INPUT, SMA
BANANA JACKS
DEMO MANUAL DC1959B
Synthesizer with Integrated VCO
A DC590 USB serial controller board is used for SPI com-
munication with the LTC6948, controlled by the supplied
FracNWizard™ software.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1959B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
FracNWizard is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
MUTE
JUMPER
DIFFERENTIAL
OUTPUT, SMA
Figure 1. DC1959B Connections
LTC6948
LOOP FILTER
COMPONENTS
5V DC SUPPLY,
BANANA JACKS
dc1959bfa
1

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Summary of Contents for Linear Technology DC1959B

  • Page 1 LTC6948. Table 1 summarizes the available http://www.linear.com/demo/DC1959B DC1959B options. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and FracNWizard is a trademark of Linear Technology Corporation. All other trademarks are the The DC1959B provides 50Ω SMA connectors for the ref- property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1959B Quick start proceDure The DC1959B is easy to set up to evaluate the performance Connect the DC590 to one of your computer’s USB ports of the LTC6948. Follow the procedure below. with the included USB cable. The DC590 and FracNWizard application are required to FracNWizard Installation control the DC1959B through a personal computer (PC).
  • Page 3 (see Figure 1 and the Typical Microsoft .NET and install the FracNWizard. Refer to the DC1959B Requirements and Characteristics table). Help menu for software operation. 4. Connect the DC590 to the DC1959B with the provided ribbon cable. DC1959B Configuration 5. Run the FracNWizard application.

  • Page 4: Assembly Options

    Loop Bandwidth – Set by Loop Filter Component Values Approximately 160kHz* Depending on the DC1959B Version *These frequencies are for the DC1959B fracnset files included with FracNWizard. **Any unused RF output must be terminated with 50Ω, or poor spurious performance may result.

  • Page 5: Pcb Layout

    DEMO MANUAL DC1959B pcb layout The top metal layer of the DC1959B is shown here as an example of good PCB layout for the LTC6948. dc1959bfa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...

  • Page 6: Parts List

    DEMO MANUAL DC1959B parts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., 0805 C1, C8, C9, C15, C18 CAP., X7R, 1.0µF, 16V, 10%, 0603 TDK, C1608X7R1C105K C2, C10 CAP., TANT., 330µF, 10V, 10%, 7343 AVX, TPME337K010R0035 C3, C7, C17, C22-C27 CAP., X7R, 0.1µF, 10V, 10%, 0402...
  • Page 7 DEMO MANUAL DC1959B parts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1959B-A Required Circuit Components DC1959B GENERAL BOM C2_F1 CAP., C0G, 2.4nF, 50V, 5%, 0603 MURATA, GRM1885C1H242JA01D CAP., X7R, 82nF, 50V, 10%, 0603 MURATA, GRM188R71H823KA93D CAP., C0G, 3.6nF, 50V, 5%, 0603...

  • Page 8: Schematic Diagram

    DEMO MANUAL DC1959B schematic Diagram dc1959bfa Arrow.com. 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 Downloaded from...
  • Page 9 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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