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Frequency Synthesizer with Integrated VCO
DESCRIPTION
DC1705A features the LTC
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 three versions of the DC1705A, one for each
version of the LTC6946. The DC1705A-A contains the
LTC6946-1, the DC1705A-B incorporates the LTC6946-2
and DC1705A-C uses the LTC6946-3.
Ultralow Noise and Spurious Integer-N
®
6946, an ultralow noise and
Figure 1. Proper Measurement Equipment Setup
DEMO MANUAL DC1705A
Each DC1705A provides 50Ω SMA connectors for the
reference frequency input, f
(REF OUT), and the differential RF output (RF
A DC590 USB serial controller board is used for SPI com-
munication with the LTC6946, controlled by the supplied
PLLWizard™ 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.
LTC6946
, the reference output buffer
REF
+
and RF
dc1705afa
–
).
1
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Related Manuals for Linear Technology DC1705A
Summary of Contents for Linear Technology DC1705A
- Page 1 Design files for this circuit board are available at and DC1705A-C uses the LTC6946-3. 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.
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Page 2: Quick Start Procedure
Set by Loop Filter Component Values 47kHz* * These frequencies are for the DC1705A 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... - Page 3 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 dc1705afa...
- Page 4 .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...
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Page 5: Troubleshooting
2. Verify that the 3.3V and 5V have the correct voltages DC1705A Requirements and Characteristics table). on them and that the reference frequency is applied to 4. Connect the DC590 to the DC1705A with the provided the REF IN SMA input. - Page 6 DEMO MANUAL DC1705A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1705A General BOM Capacitor, X7R 0.022μF 50V 5% 0603 AVX 06035C223JAT2A Capacitor, COG 6800pF 50V 5% 0805 Murata GRM2195C1H682JA01D Capacitor, COG 2700pF 50V 5% 0603 Murata GRM1885C1H272JA01D C1, C8, C9, C18 Capacitor, X7R, 1μF , 16V, 10%, 0805...
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Page 7: Schematic Diagram
DEMO MANUAL DC1705A SCHEMATIC DIAGRAM dc1705afa... - Page 8 DEMO MANUAL DC1705A 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.
- Page 9 DEMO MANUAL DC1705A LAYOUT The top metal layer of the DC1705A is shown here as an example of good PCB layout for the LTC6946. dc1705afa 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-...
- 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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