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dc1705cfb
DEMO MANUAL DC1705C
DESCRIPTION
LTC6946
Ultralow Noise and Spurious Integer-N
Frequency Synthesizer with Integrated VCO
DC1705C 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 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
REF
(REF+ IN), the reference
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.
Figure 1. Proper Measurement Equipment Setup
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