LXI digitisers sample signals at up to 5Gsample/sec

Article By : Graham Prophet

Each channel of a DN6.22x series digitiser features its own ADC, acquisition memory (1GSample/channel) and independent signal conditioning circuitry.

Germany-based Spectrum has introduced its DN6.22x series of LXI digitisers, which offer fully synchronous Gsample/sec acquisition on up to 24 channels.

The entry-level DN6.221 models offer versions with 12, 16, 20 and 24 channels, with each channel capable of sampling electronic signals at rates up to 1.25Gsample/sec. The top-of-the-line DN6.225 series increases performance by allowing up to 12 channels to sample at 2.5Gsample/sec or 6 channels at 5Gsample/sec.

The digitizerNetbox products are complete instruments that include all the tools necessary to capture, digitise and analyse signals, and operate connected to a host computer (e.g. laptop or workstation) running Spectrum's SBench 6 software. Standard with every unit, SBench 6 allows the user to control all the digitiser’s operating modes and hardware settings from one graphical user interface.

The software has features for waveform display, data analysis and documentation. Acquired and analysed waveforms can be stored and exported to other devices or other software programs in a variety of formats such as MATLAB, ASCII, binary and wave.

Each channel of a DN6.22x series digitiser features its own ADC, acquisition memory (1GSample/channel) and independent signal conditioning circuitry. The ADCs are clocked synchronously to ensure that inter-channel timing measurements can be made with the best possible accuracy as well as maintaining a constant phase relationship.

Front-end amplifiers allow input signals to be correctly scaled, so that the digitisers can utilise the ADC’s complete 8-bit dynamic range. Programmable full-scale ranges (into 50Ω termination) go from ±200 mV up to ±2.5V or optionally from ±40 mV up to ±500 mV. Signal conditioning also includes AC/DC coupling and programmable input offset.

The DN6.221 models, with 1.25Gsample/sec sampling rate, are matched with amplifiers that deliver over 500MHz of bandwidth, while the DN6.225 models increase this to 1.5GHz. The combination of fast sampling rate, wide bandwidth and long acquisition memory enables the digitisers to capture long, complex, high frequency signals. It also makes it possible to characterise and measure fast events that go down into the nano- and sub-nanosecond timing ranges.

The instruments also include multiple acquisition modes; combination triggering is available. The units are fully compliant to LXI standards and can be integrated into production test and ATE, with Gbit Ethernet connectivity.

User may write their own control programs in programming languages including C++, Visual Basic, VB.NET, C#, J#, Delphi, IVI, Java and Python code. Third party software support is also provided for LabVIEW, LabWindows and MATLAB.

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