User`s manual

X5-GSPS XMC Module
Calibration coefficients for gain should not be outside the range of 0.95 to 1.05, and offset should not be outside the range of +/-400
counts for the A/Ds . If the calculated coefficients are larger than this, they are either wrong or the channel is damaged.
Using the X5-GSPS
Where to start?
The best place to start with the X5-GSPS module is to install the module and use the SNAP example to acquire some data.
This program lets you log data from the module and use all the features like triggering, clocks, alerts and calibration ROM.
You can use this program to acquire some data and log it to disk. This should let you verify that the module can acquire the
data you want and give you a quick start on deciding what sample rates to use, how to trigger the data acquisition best for
your application, and just get familiar with using the module.
The program also shows how to use BinView, a data analysis and viewing program by Innovative, that will let you see what
you acquired in detail. Both time domain and frequency domain data can be viewed and analyzed. Data can also be exported
to programs like Excel and MATLAB for further analysis.
Before you begin to write software, taking a look at SNAP will allow you see everything working. You can then look at the
code for SNAP and modify it for your application or grab code from it that is useful.
Getting Good Analog Performance
The X5-GSPS is capable of digitizing very high frequency signals. To maximize signal to noise ratio and spur performance,
it is important to use do the following
● Use only low jitter clock sources. The higher the input/output frequency, the more sensitive the system will be
to clock jitter.
● Band limit input signals if possible. This avoids noise contributions and aliasing caused by out-of band energy
in the input signal
● Scale your input signals to take advantage of the full scale input ad output ranges of the converters. This will
maximize signal to noise in most cases. Custom input and output ranges can be ordered if necessary.
● Use high coax cables at all times, and terminate all signals to 50 ohms. Cables should be RG-179 or better.
● Reference input signals to the module ground. Be sure not to introduce ground loops.
● Provide sufficient signal strength to drive the input. The X5-GSPS terminates its inputs to 50 ohms, so signals
sources must be able to drive the DC termination effectively.
If you decide to test the X5-GSPS to verify its performance, be aware that most signal sources are not good enough without
additional filtering and careful use. Most single-ended lab instruments are limited by their distortion, especially at higher
frequencies, to about 70 dB. Post-filter is necessary to clean them up if you want to test the X5-GSPS.
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