[XCM-017] A/D, D/A Demonstration. Display a video signal on DSO Nano V2 using Xilinx Hi-speed Transceiver.

Last Updated: Friday, 06 April 2018

XCM-017 Demonstration.
Display a video signal on DSO Nano V2 using Xilinx Hi-speed Transceiver.

This is an A/D and D/A demonstration using an XCM-017, Xilinx Virtex-5 LXT FPGA board, and a Liner Technology LTC2274 evaluation board.

The XCM-017 imports an analog VGA signal (100Msps) and sends data to a D/A converter in slow speed. The DACed analog signal is displayed on Seed Studio, DSO Nano V2. This demonstration is just an example for reference.

 


System Configuration

Components
Virtex-5 LXT FPGA Board XCM-017 HuMANDATA
SIF40 to MMCX Conversion Boad ACC-010 HuMANDATA
A/D Converter LTC2274 Evaluation board Liner Technology
D/A Converter UTL-012 HuMANDATA
Pocket size Oscilloscope DSO Nano V2 Seed Studio
Download cable HW-USB-II-G Digilent
Video pattern generator GV-241 PROMAX
 

XCM017_ADDA_block_eng

The Pattern generator (GV-241) outputs high frequency signals for DSO Nano. In order to monitor signals with DSO Nano, the FPGA slows the rate of data down in 1/100 of original and outputs to UTL-012, isolated 16-bit D/A conversion board, to convert digital data to analog data.

 

Waveform
tek00000.250

 
Bottom waveform is raw signal generated by pattern generator. (2us/Div)
Top is slow-downed waveform by FPGA. A down pulse is added manually for capture.

DC component of a signal is not replayed in DACed waveform because of a limitation comes from A/D converter’s input circuit (About 100kHz or below will be cut off). High-frequency component of signal is reduced its amplitude because of a limitation comes from D/A converter’s slew rate.

Captured A/D data in Virtex-5. (using ChipScope)

ChipScope.250

Test video signals make a monochrome striped pattern on a monitor. Sparse and dense pattern matches with above waveform.

0050.250
 

Captured waveform (DSO NANO V2)

DSO Nano displays authentic-looking waveform on it.

0020.250
 
Original high-speed signal cannot be captured without the system.

0019.250

As you can see, video signal was captured by an affordable oscilloscope.
This demonstration is just only for a demonstration and has no practicality. But we are grad if this gives you some hints for using our products.

 


GTP Transceiver Setting

- Data Rate : 2Gbps
- Reference Clock : GREFCLK 100MHz (Multiple on-boarded 50MHz into 100MHz by PLL)
wizard_p7.250
 
- RX Comma Alignment : Enable(K28.5)
wizard_p7.250
 
- Clock Correction : Enable (K28.5), Sequence Length:1
wizard_p10.250
 

About LTC2274

LTC2274 is a 105Msps, 16bit A/D converter. The captured analog data is converted into 8B10B encode serial data, so it is easy to connect to FPGA high speed serial interface (RocketIO, GTP,,)

 


About DSO Nano V2

DSO Nano V2 is Seed Studio's affordable pocket-size oscilloscope. I choose this because of just only price. It is very accessible. The DSO Nano V2's spesification is below:
 
DSO_Nano_v2_Man690
( Captured user manual, at the date of 2011/02/15)
 

Design Files

Please be forewarned that we do not offer sample design files.
 

We hope you find this demonstration informative.
Plase let us know if you notice any mistakes.

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