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dc1705afa
DEMO MANUAL DC1705A
DESCRIPTION
LTC6946
Ultralow Noise and Spurious Integer-N
Frequency Synthesizer with Integrated VCO
DC1705A features the LTC
®
6946, an ultralow noise and
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.
Each DC1705A provides 50Ω SMA connectors for the
reference frequency input, f
REF
, the reference output buffer
(REF OUT), and the differential RF output (RF
+
and 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.
Figure 1. Proper Measurement Equipment Setup
