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PCI data-acq plug-in packs high-speed FPDP II port

Posted: 19 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:interactive circuits and systems? ics? ics-645c? data-acq board? da board?

Interactive Circuits and Systems (ICS) offers a raft of open-architecture products, mostly for high-end embedded sensor processing and data-acq applications. Notably, the company is a member of the Radstone Group. Radstone is a supplier of ruggedized embedded computers that are typically used in MIL and aerospace applications. It's no surprise that ICS's products also find a home in many military platforms and RF test systems.

ICS' new ICS-645C data-acq board is derived from the company's predecessor ICS-645 product. It too is designed for applications such as sonar, radar or high-speed test. It also lets you process up to 32 channels at sample rates of up to 20MHz/channel.

Analog Devices silicon

Both the earlier board and this latest product owe their performance largely to Analog Devices' AD9260 over-sampling A/D converter chips.

The power-managed AD9260 switched-capacitor chips are 16bit converters fabbed in CMOS. These ICs ensure wide dynamic range by using an over-sampling ratio (8X). Analog Devices does that using a proprietary technique combining delta-sigma A/D and pipelined converters on-chip.

Regardless of what's inside the packages, the AD9260 chips ensure 60dB of common-mode rejection, and pack built-in half-band FIR (finite impulse response) filters (three of them). These provide 8X decimation filtering with 85dB of stop-band attenuation and only 0.004dB of pass-band ripple.

A long format plug-in

The ICS-645C board is a long-format PCI bus plug-in that's compatible with PCI 2.1, and supports universal signaling at both 5V and 3.3V. A PCI bus master interface also lets you operate in either chained scatter-gather mode, or using non-chained-mode burst transfers.

Notably, the card's FPDP (Front Panel Data Port) is upgraded over that of the ICS-645. It now supports FPDP II output, which is up to 400MBps.

In use, the ICS-654C's AD9260 chips provide four programmable over-sampling ratios, while ensuring wide dynamic range over a wide bandwidth. Each high-Z (greater than a megohm) input channel can operate at 0.01V, 0.1V, 1V or 10V full-scale, converting at a minimum sample rate of 1kHz. SINAD (signal-to-noise ratio plus distortion) is >8dB for decimation 8.

The board also includes a daughter card that provides signal conditioning for each analog-input channel. The daughter card dishes up programmable gain control in four ranges, as well as fixed-frequency Butterworth-response anti-aliasing filters. These filters have cut-off frequencies of 1.25MHz, but you can optionally order filters with custom cut-off frequencies.

A basic ICS-645C with eight channels costs about $14,000. If you opt for 16 channels, add about $2,000 more. A full-tilt 32-channel ICS-645C will cost about $18,000.

- Alex Mendelsohn


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