Chapter 3 Hardware OverviewPCI/PXI-1408 and NI-IMAQ for Win95/NT3-2 ©National Instruments CorporationFigure 3-1. 1408 Device Block DiagramVideo MuxYou can select any of the four AC-coupled video inputs through thevideo multiplexer circuitry.Antichrominance FilterThe 1408 device includes an antichrominance filter that removeschrominance from a composite color video signal. You can use twosoftware-selectable antichrominance filters: a 3.58 MHz notch filter toremove color information from an NTSC signal and a 4.43 MHz notchfilter to remove color information from a PAL signal.Programmable Gain and OffsetThe 1408 device uses programmable gain and offset circuitry tooptimize the input signal range.PCI InterfaceandScatter-GatherDMA Controllers25-Pin DSUB ConnectorBNCPCI BusPCLK,HSYNC,VSYNCMuxGeneratedPCLK,HSYNC,VSYNCCSYNCMuxGenlock andSynchronizationCircuitryVCO andPLLCircuitryPixelAspectRatioCircuitryFour External TriggersVSYNCand HSYNCPCLKTrigger Controland MappingCircuitryAcquisition andRegion-of-InterestControlFIFOs8-Bit A/Dand LUTProgrammableGain andOffsetRTSI BusExternal PCLK,VSYNC, and HSYNCAntichrominanceFilterVideo MuxVideo 0, 1, 2, 3Video 0External CSYNCVideoIn
