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Single-slot high-speed PXI digitisers

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article image High speed waveform solutions.

ACQIRIS has introduced 3U single-slot PXI digitisers that provide high-speed waveform recording solutions for use in any PXI and CompactPCI chassis.

The new DC140 and DC135 digitisers deliver very high bandwidths, 1GHz and 500MHz respectively, and offer a convenient channel multiplexing capability, which allows users to select between single or dual-channel data acquisition modes, effectively doubling the available sampling rates and acquisition memory.

The digitisers are fully compliant with both the PXI and CompactPCI standards, and are ideal for integration with complementary instrumentation modules for fast single and dual-channel applications, including telecommunications, ATE, lidar, radar, semiconductors, ultrasonic, mechanics, and physics.

The DC140, with 1GHz of bandwidth, provides synchronous sampling on both input channels of 1GS/s with up to 8 Mpoints of acquisition memory; in single-channel applications this doubles to 2GS/s and 16 Mpoints.

The DC135 similarly offers dual-channel sampling rates of up to 500MS/s and 2 Mpoints of acquisition memory per channel, or 1GS/s and 4 Mpoints in singlechannel mode, with 500MHz of bandwidth.

It is the best solution for cost-effective dual-channel measurements on signals up to a frequency of 500 MHz.

With synchronous ADC sampling, well-matched front-end electronics, and a precision time base (±2ppm), the digitisers are able to perform significant cross-channel timing measurements including jitter, phase, and propagation delay.

The digitisers' long acquisition memories are essential for maintaining fast sampling rates, and therefore good timing resolution.

For example, in single-channel mode, the DC140 with 16 Mpoints of memory can record a signal over an 8ms period with a sampling rate of 2GS/s (0.5ns per point).

This fast sampling rate ensures that all high-frequency signal components, up to the full bandwidth of the digitiser, are accurately recorded.

If the memory was reduced to 20 kpoints, the sampling rate would have to fall to just 2.5MS/s to acquire for the same duration (8 ms).

Frequencies above 1.25 MHz would then be incorrectly digitised and important events might be missed completely.

Both digitisers include the Acqiris Ctrl I/O, a unique front-panel system that simplifies system integration and facilitates synchronisation with existing customer systems.

Consisting of four MMCX-type connectors on the front panel, Ctrl I/O provides an external clock input, a trigger output, and two digital control lines.

The digitisers come complete with all necessary software, including AcqirisLive, a digitiser control program that enables them to operate "out-of-the-box", and associated driver libraries.

The digitisers are fully programmable and run under Microsoft Windows 95/98/2000/NT4/XP, Linux, and VxWorks operating systems.

In addition, they can be used with off-the-shelf software packages such as National Instruments' LabWindows/CVI, LabVIEW and The Mathworks' MATLAB.

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