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National Instruments Corporation
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Hardware Overview
This chapter describes the features of the NI 409 device and includes
information about acquisition modes, analog front-end considerations,
and clamping.
Functional Overview
The NI 1409 features a high-speed data path optimized for the acquisition
and formatting of video data from analog cameras. The NI 1409 can
acquire from RS-170/NTSC, CCIR/PAL, VGA, and progressive scan
cameras, as well as from non-standard cameras such as line scan cameras.
The NI 1409 digitizes analog video signals to 8 or 10 bits of resolution at
sampling frequencies up to 40 MHz.
The NI 1409 has a factory-calibrated gain circuit to improve measurement
accuracy and board-to-board consistency. It uses a PCI interface for
high-speed data transfer, 16 MB of SDRAM for data buffering, and
region-of-interest control circuitry for optimizing the data transfer. The
16 MB of SDRAM also allows you to acquire entire images into onboard
memory when necessary. The NI 1409 includes four external triggers,
four camera control signals, seven RTSI bus triggers, and six video
synchronization signals.