Compatible with DE2 and other Youjing development boards, the dual-channel AD9744 high-speed DAC module with Xiaomeige development board interface.
The output is a transformer output, which has good high-frequency characteristics but poor low-frequency (below 1Mhz) characteristics.
The output filter is impedance matched according to the external 50 ohm transmission line and 50 ohm impedance.
If you want to connect it directly to the oscilloscope, please put a 100 ohm resistor on the SMA socket, otherwise the impedance mismatch will cause the output waveform to be abnormal.
The test effect is as shown in the figure (FPGA output to DAC clock is 200Mhz):
20Mhz sine wave:
14Mhz triangle wave:
6.7Mhz square wave:
6.7Mhz triangle wave:
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