DAC3283EVM: DAC3283 cannot output any current

Zhu Han

Prodigy 90 points

Part Number: DAC3283EVM
Other Parts Discussed in Thread: FMC-DAC-ADAPTER, , DAC3283

We are going to use DAC3283 in our product, so we brought DAC3283EVM board and one FMC-DAC-ADAPTER.

Use Xilinx standard KC705 FMC output LVDS data and clock to DAC3283.

Settings as below :

TXENABLE pin connect to VCC.
Interpolation : 2x
dac clock : 307.2Mhz
ostr clock : 19.2Mhz
FPGA output clock to DAC3283 : 307.2Mhz
FPGA output frame to DAC3283 : 19.2Mhz, one signal pulse according to datasheet
FPGA output data, we tested Sine waves, Squre waves, and constant value such as 0x7777, 0x3333.

Using SPI interface, we could read the temperature sensors, control CDC62005 clock frequency, and use oscilloscope to make sure all signals output to DAC3283 are valid.

But we cannot output any current, IOUTA and IOUTB seems no any signals.

We also make our own board, and the result is the same, no any current output.

So, we are confused using this DAC3283, is there any tips how to control the output?

over 5 years ago

0 Kang Hsia over 5 years ago

TI__Guru 71019 points

Hello Zhu Han,

Your setup sounded like a standard Xilinx/Avnet Speedway development kit standard setup profile. The configuration above should be the default DAC3283 GUI setting and it should work directly with the Xilinx ML605 kit. I am not sure if there are difference in setup when upgrading to KC705. You will have to contact Xilinx for support.

To test the DAC output, you may inject all ones (full-scale positive) or all zeros (full-scale negative) to the DAC. You may then turn on the Fs/4 coarse mixer of the DAC. You should be able to observe a tone at 153.6MHz. (assuming sampling rate of 614.4MSPS)

Keep in mind the DAC output is transformer coupled. There is a bandpass behavior of the transformer from 10MHz to 500MHz, I believe. You will need to double check if your sine/square wave injections are within the bandpass range.

There are many posts regarding the DAC3283 and the Xilinx Avnet speedway kit. Please do some search for the posts for more insight. Good luck.

-Kang

0 Zhu Han over 5 years ago in reply to Kang Hsia

Prodigy 90 points

Hello Kang

Thank you so much for the reply!

Since there is a design on ML605, it's easy for me to migrate ML605 to KC705. Could you tell me where to find download the ML605 design?

Now we have disconnect the FR with DAC3283, we just connect 50OHM resistor of IOUTA and IOUTB direct to GND. But till now, for ones, Fs/4, Fs/2, no output.