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DESCRIPTION
DC1705C features the
spurious integer-N frequency synthesizer with integrated
VCO. The VCO uses no external components and is inter-
nally calibrated without external system support.
There are four options of the DC1705C, one for each ver-
sion of the LTC6946. Table 1 summarizes the available
DC1705C options.
Each DC1705C provides 50Ω SMA connectors for the
reference frequency input, f
Arrow.com.
Downloaded from
Ultralow Noise and Spurious Integer-N
Frequency Synthesizer with Integrated VCO
LTC
6946, an ultralow noise and
®
(REF+ IN), the reference
REF
Figure 1. Proper Measurement Equipment Setup
DEMO MANUAL DC1705C
output buffer (REF OUT), and the differential RF output
+
–
(RF
and RF
). A DC590 USB serial controller board is
used for SPI communication with the LTC6946, controlled
by the supplied PLLWizard™ software.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1705C
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.
LTC6946
dc1705cfb
1
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Summary of Contents for Linear Technology DC1705C
- Page 1 LTC6946. Table 1 summarizes the available http://www.linear.com/demo/DC1705C DC1705C options. 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 Each DC1705C provides 50Ω SMA connectors for the are the property of their respective owners.
- Page 2 Set by Loop Filter Component Values 47kHz* * These frequencies are for the DC1705C pllset files included with PLLWizard. Note 1: A low noise 10MHz or 100MHz reference frequency, such as the Wenzel 501-04608A or 501-04516D OCXO, is recommended. If using a different...
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Page 3: Quick Start Procedure
The DC590 and PLLWizard application are required to 3. Run the QuikEval installation program and follow the control the DC1705C through a personal computer (PC). on-screen instructions. More detailed installation infor- mation may be found in the DC590’s Quick Start guide. - Page 4 Windows 2003 Server, Windows Vista, Windows 7 Depending upon your .NET version, choose one of • Microsoft .NET 2.0 or later two PLLWizard setup programs, downloaded from http://www.linear.com/software. • Windows Installer 3.1 or later • Linear Technology’s QuikEval and DC590 hardware dc1705cfb Arrow.com. Arrow.com. Arrow.com. Arrow.com.
- Page 5 .NET 2.0 but want the latest .NET installed. loaded from Linear Technology’s website. You should pick • Choose PLLWizardSetup_net20 if you have less than one of the following two choices, depending upon your .NET 2.0, and want faster installation (no additional...
- Page 6 2. Verify that the 3.3V and 5V have the correct voltages DC1705C Requirements and Characteristics table). on them and that the reference frequency is applied to 4. Connect the DC590 to the DC1705C with the provided the REF IN SMA input.
- Page 7 DEMO MANUAL DC1705C QUICK START PROCEDURE dc1705cfb 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...
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Page 8: Parts List
DEMO MANUAL DC1705C PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1705C GENERAL BOM C1, C8, C9, C18 CAP ., X7R, 1.0μF , 16V, 10%, 0805 TDK, C2012X7R1C105K C2, C10 CAP ., TANTALUM, 330μF , 10V, 10%, 7343 AVX, TPME337K010R0035 C3, C13, C17, C22, C23, C24, C25, C26 CAP ., X5R, 0.1μF , 10V, 10%, 0402... - Page 9 DEMO MANUAL DC1705C PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1705C-B GENERAL BOM CAP ., X7R 0.022μF 50V 5% 0603 AVX 06035C223JAT2A CAP ., COG 6800pF 50V 5% 0805 MURATA GRM2195C1H682JA01D CAP ., COG 2700pF 50V 5% 0603 MURATA GRM1885C1H272JA01D RES., CHIP , 453Ω, 1/10W 1%, 0603...
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Page 10: Schematic Diagram
DEMO MANUAL DC1705C SCHEMATIC DIAGRAM dc1705cfb Arrow.com. Arrow.com. 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 Downloaded from Downloaded from... - Page 11 DEMO MANUAL DC1705C SCHEMATIC DIAGRAM Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6946 when communicating to it starts before powering it up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC6946. The EEPROM is for identification and is not needed to program the LTC6946.
- Page 12 DEMO MANUAL DC1705C LAYOUT The top metal layer of the DC1705C is shown here as an example of good PCB layout for the LTC6946. dc1705cfb Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from...
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Page 13: Revision History
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 14 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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