2
dc1705cfa
DEMO MANUAL DC1705C
PARAMETER
INPUT OR OUTPUT
PHYSICAL LOCATION
DETAILS
3.3V Power Supply
Input
3.3V and GND Banana Jacks
Low Noise and Spur-Free 3.3V, 115mA
5V Power Supply
Input
5V and GND Banana Jacks
Low Noise and Spur-Free 5V, 45mA
REF
+
IN, Reference Frequency
Input
J1 SMA Connector
Low Noise 10MHz or 100MHz*, 6dBm into 50Ω
(Note 1)
REF OUT, Buffered Reference
Output
J3 SMA Connector
Frequency = f
REF
, 0dBm
RF
+
and RF
–
Two Outputs
J4 and J5 SMA Connectors
Frequency: 900MHz*, Power: 0dBm, Frequency
Range: Depends on the version of the LTC6946
device – refer to Table 1, Step Size: 200kHz*
Loop Bandwidth
–
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
frequency, make sure to update the f
REF
and R_DIV boxes under the System tab in PLLWizard so that f
PFD
is still 1MHz. For example, if a 20MHz clock is
used, f
REF
should be changed to 20MHz and R_DIV to 20. REF BST and FILT under the System tab in PLLWizard might need to be changed if the reference
frequency and/or power is different than what is recommended in the table above. More information can be found in the LTC6946 data sheet.
Table 1. DC1705C Options and Frequency Ranges
ASSEMBLY VERSION
PART NUMBER
VCO FREQUENCY RANGE (GHz)
OUTPUT DIVIDER SETTINGS
DC1705C-A
LTC6946IUFD-1
2.240 to 3.740
Integers 1 through 6
DC1705C-B
LTC6946IUFD-2
3.080 to 4.910
Integers 1 through 6
DC1705C-C
LTC6946IUFD-3
3.840 to 5.790
Integers 1 through 6
typical Dc1705c requirements anD characteristics
quick start proceDure
The DC590 and PLLWizard application are required to
control the DC1705C through a personal computer (PC).
DC590 Configuration
The DC590’s QuikEval™ drivers must be installed before
the DC590 will be able to communicate with the LTC6946.
To configure the DC590, follow the procedure below, start-
ing with step 1. If you have already installed the DC590
software previously, skip to step 5.
Note:
Once the QuikEval software is installed, the applica-
tion does not need to be executed to run PLLWizard or to
control the DC1705C.
1. Do Not plug in the DC590 before running the installation
program.
2. Download the QuikEval installation program from
http://www.linear.com/software
.
3. Run the QuikEval installation program and follow the
on-screen instructions. More detailed installation infor-
mation may be found in the DC590’s Quick Start guide.
4. Exit the QuikEval program once the installation is com-
plete, as it is not needed to run the PLLWizard software.
5. Place the DC590 jumpers in the following positions:
JP4
EE Must be in the “EN” position.
JP5
ISO “ON” must be selected.
JP5
SW “ON” must be selected.
JP6
VCCIO “3.3V” must be selected. This sets the SPI
port to 3.3V operation.
6. Connect the DC590 to one of your computer’s USB
ports with the included USB cable.
