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Analog input
Matrox Helios eA/XA includes the electronic circuitry needed to select, amplify,
filter, and drive the video signal prior to sending it to the analog-to-digital (A/D)
converters.
Matrox Helios eA/XA has four wide-band analog acquisition paths. The following
tables describe the video source combinations from which simultaneous,
independent acquisition is supported and the acquisition paths to which they must
be connected:
Configuration
Asynchronous video sources
supported
1
1 4-tap video source
2
1 3-tap video source (RGB) and
1 1-tap video source
3
2 2-tap video sources
4
1 2-tap video source and
2 1-tap video sources
5
1 2-tap video source and
2 1-tap video sources
6
4 1-tap video sources
1. Note that taps expected to come from the same video source can also come from different video sources as long as they are
synchronized (genlocked). In this case, the grabbed data is stored in separate color bands of the same buffer; the buffer can
be in planar format.
The analog input section can also be configured so that the same video signal
drives two analog-to-digital converters (A/Ds). By using two A/Ds to sample the
same video signal and clocking each A/D with a different phase-shifted clock, the
overall effective sampling rate can be doubled.
Sampling rate
80 MHz
160 MHz
The pixel clock setting automatically determines how many A/Ds are used per
acquisition path. For example, by specifying a pixel clock in the range of 81 MHz
to 160 MHz, two A/D's are automatically selected. The pixel clock setting is
specified in the DCF.
Matrox Helios eA/XA acquisition section
1
1-tap
1-tap
# of acquisition
paths available
4
2
Acquisition path
0
1
2
4-tap
3-tap
2-tap
2-tap
1-tap
1-tap
1-tap
1-tap
Acquisition
# of A/Ds per
path #
acquisition paths used
0, 1, 2, 3
1
0 or 2
2
61
3
1-tap
2-tap
1-tap
2-tap
1-tap
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