Chapter 3
Hardware Overview
3-2
ni.com
The block diagram in Figure 3-1 illustrates the key functional units of the
PCI/PXI-1409.
Figure 3-1.
1409 Device Block Diagram
Video Mux
The video multiplexer routes one of the four AC-coupled video inputs to
the 10-bit ADC circuitry. The input impedance at the input to the board is
75
Ω
.
Programmable Gain and Offset
The PCI/PXI-1409 uses programmable gain and offset circuitry to optimize
the input signal range.
Analog Bandwidth Control Circuitry
You can select either the full bandwidth of 30 MHz or a reduced bandwidth
of 9 MHz. The 9 MHz bandwidth setting is available using a 5th order
Butterworth lowpass filter.
10-Bit ADC
The 10-bit ADC digitizes the conditioned video signal.
Digital
Input/Output
Circuitry
RTSI Bus
68-pin
VHDIC
Connector
Video 0
PCI
Bus
Video
Mux
Programmable
Gain and Offset
PCI Interface and
Scatter-Gather
DMA Controller
Onboard
Memory and
Control Circuitry
Analog
Bandwidth
Control
Circuitry
10-Bit
ADC
Digital
Filter
and
LUT
BNC
Video
0,1,2,3
Acquisition and
Region-of-Interest
Control
Genlock Circuit
and SYNC Mux
Aspect Ratio Correction
HSYNC, VSYNC
PCLK
External PCLK,
HSYNC, VSYNC
External CSYNC
4 Camera Control Lines
4 External Triggers
External Clock Generation
