At the moment we're working on a PCB design for the video input. This board will be a daughter board for the Altera Stratix development board.
The daughter board will have the video input (BNC connector to camera) and the video decoder (Analog Devices ADV7183A). The digital output from the decoder will plug straight into the FPGA on the development board.
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The ADV7183A (decoder IC) requires 3.3V and 1.8V supplies. We are planning to take the 3.3V through one of the header pins on the Stratix board.
We will need to find a suitable regulator IC to produce 1.8V.
At the moment we have the sample design in the ADV7183A datasheet. We also have a schematic from one of the Analog Devices DSP development boards that uses the same video decoder. Hopefully we can use both designs to produce a design that will work.
We need to either source a crystal oscillator, or use a 27Mhz crystal with supporting capacitors.
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We have also put a 10 pin IDC socket on the board to give access to 9 General I/O pins on the FPGA + Ground.
This will allow us to connect to a PC parallel port for testing and final system demonstration. Otherwise we would have to use the on-board serial port, which would be quite slow.
The website needs updating to show the latest PCB and schematic.
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After a few delays, hopefully the board will come back from the manufacturer on the 29th June. It was scheduled to arrive on the 23rd, but there was a problem with the panel submission procedure.
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Major issue, the development board can not supply the 300mA required for the daughter board. From the data sheet: "3.3V max 4A"?!? We will have to build an external power source of the interface.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
At the moment we're working on a PCB design for the video input. This board will be a daughter board for the Altera Stratix development board.
The daughter board will have the video input (BNC connector to camera) and the video decoder (Analog Devices ADV7183A). The digital output from the decoder will plug straight into the FPGA on the development board.
The ADV7183A (decoder IC) requires 3.3V and 1.8V supplies. We are planning to take the 3.3V through one of the header pins on the Stratix board.
We will need to find a suitable regulator IC to produce 1.8V.
At the moment we have the sample design in the ADV7183A datasheet. We also have a schematic from one of the Analog Devices DSP development boards that uses the same video decoder. Hopefully we can use both designs to produce a design that will work.
We need to either source a crystal oscillator, or use a 27Mhz crystal with supporting capacitors.
Switching regulators produce quite a lot of noise, so we will use a linear regulator. We will need an output current of around 150-200mA.
We will put ferrite beads on all the tracks to supply pins.
We may use an oscillator instead of crystal because they are similar size and may not need any passive components. Need to research and confirm that.
Check it out!! revision 45...
My whole night's work!
Aarrr...
Been told it's all wrong...
Start again.
All that's needed to finish off the design
is to tidy up a few tracks and triple-check that everything is ready to send to a manufacturer.
The due date for design is now the 14th May.
The design now done, will be send off to be made this week.
We have also put a 10 pin IDC socket on the board to give access to 9 General I/O pins on the FPGA + Ground.
This will allow us to connect to a PC parallel port for testing and final system demonstration. Otherwise we would have to use the on-board serial port, which would be quite slow.
The website needs updating to show the latest PCB and schematic.
After a few delays, hopefully the board will come back from the manufacturer on the 29th June. It was scheduled to arrive on the 23rd, but there was a problem with the panel submission procedure.
The PCB has been built and now we have to confirm that it works.
Major issue, the development board can not supply the 300mA required for the daughter board. From the data sheet: "3.3V max 4A"?!? We will have to build an external power source of the interface.