Linear Technology LTC2171-14 14-Bit, 40Msps, 1.8V Quad Serial ADC, 5MHz DC1525A-E Scheda Tecnica

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dc1525af

DEMO MANUAL DC1525A

using a sinusoidal signal generator a squaring circuit can 
be used. Linear Technology also provides demo board 
DC1075A that divides a high frequency sine wave by four, 
producing a low jitter square wave for best results with 
the LTC2175.

Using bandpass filters on the clock and the analog input 
will improve the noise performance by reducing the 
wideband noise power of the signals. In the case of the 
DC1525A a bandpass filter used for the clock should be 
used prior to the DC1075A. Data sheet FFT plots are taken 
with 10 pole LC filters made by TTE (Los Angeles, CA) to 
suppress signal generator harmonics, non-harmonically 
related spurs and broadband noise. Low phase noise Agi-
lent 8644B generators are used for both the Clock input 
and the Analog input.

Data outputs, data clock, and frame clock signals are avail-
able on J1 of the DC1525A. This connector follows the 
VITA-57/FMC standard, but all signals should be verified 
when using an FMC carrier card other than the DC1371.

The DC1371 is controlled by the PScope™ System Soft-
ware provided or downloaded from the Linear Technology 
website at http://www.linear.com/software/.

To start the data collection software if PScope.exe is in-
stalled (by default) in \Program Files\LTC\PScope\, double 
click the PScope Icon or bring up the run window under 
the start menu and browse to the PScope directory and 
select PScope.

If the DC1525A demonstration circuit is properly connected 
to the DC1371, PScope should automatically detect the 
DC1525A, and configure itself accordingly.

If everything is hooked up properly, powered and a suit-
able convert clock is present, clicking the Collect button 
should result in time and frequency plots displayed in 
the PScope window. Additional information and help for 

PScope is available in the DC1371 Quick Start Guide and in 
the online help available within the PScope program itself.

PScope has the ability to program the DC1525A board 
serially through the DC1371. There are several options 
available in the LTC2175 family that are only available 
through serially programming. PScope allows all of these 
features to be tested.

These options are available by first clicking on the Set 
Demo Bd Options icon on the PScope toolbar (Figure 3).

This will bring up the menu shown in Figure 4.