Linear Technology DC1765A, Демонстрационное руководство

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dc1765af
DEMO MANUAL DC1765A
Description
LTC6957-1/LTC6957-2
Low Phase Noise, Dual LVPECL or LVDS
Output Buffer/Driver/Logic Converter
Demonstration Circuit 1765A features the LTC
®
6957-1 /
LTC6957-2 , a low phase noise, dual LVPECL or LVDS
output buffer/driver/logic converter.
The DC1765A provides 0.5" spaced SMA connectors for
the differential inputs and outputs. The inputs are termi-
nated to on-board 50Ω resistors. The LVPECL outputs
of the DC1765A-A are individually biased through 130Ω
resistors to ground and then AC-coupled. The transmis-
sion lines are 50Ω, making the outputs suitable to drive
50Ω input impedance instruments. The LVDS outputs
of the DC1765A-B are terminated with 100Ω differential
and are DC-coupled. The DC1765A allows the user to
take advantage of the shutdown and bandwidth selection
features of the LTC6957. The DC1765A can operate with
a single-ended or differential sine wave or square-wave
input signal. Supply the DC1765A with 3.3V and it is
ready to function. The DC1765A offers extra component
population options to make it compatible with different
logic signal types.
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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Figure 1. DC1765A Inputs and Outputs