DAC5675: Clock requirement

canberk

Part Number: DAC5675

Hello,

There is "DAC5675" in our own custom board. And we observed that DAC5675 sampled without giving the clock input, we are just driving data lines. And this sampling rate is equal to rate of driving data lines. Examples: If we drive data lines (from FPGA) at 320 MHz, then DAC5675 working at 320 Msps. And if we drive data lines at 300 MHz, DAC5675 300 Msps.

Is this a normal situation for DAC5675? Can DAC5675 generate clock from data lines? I guess it cant.

If it cannot generate clocks from the data lines, then we have a problem. What could be our problem?

Thanks in advance.

Canberk

over 5 years ago

0 Neeraj Gill over 5 years ago

TI__Mastermind 20541 points

Hi Canberk,

DAC should not work without the clock signal. Can you please explain what you mean by DAC sampled without giving clock input? Do you mean you were getting an analog signal output from the DAC? No the DAC cannot drive the clock from data lines.

Regards,

Neeraj

0 canberk over 5 years ago in reply to Neeraj Gill

Prodigy 40 points

Hi Neeraj,

We do not give any signal to the clock pins (CLK, CLKC) of the DAC. We only drive data lines (D0A, D0B, D1A, D1B ..., D13A, D13B) from FPGA. And in this case, when we measure the clock pins (CLK, CLKC) of the DAC with an oscilloscope, we only see noise. However, we see the signal in the analog output of the DAC.
*I also observed that the signal I saw at the DAC output was sampled at the same speed as the driving speed of the data lines. (As I mentioned above)

Regards,

Canberk

0 Neeraj Gill over 5 years ago in reply to canberk

TI__Mastermind 20541 points

Hi Canberk,

You should not drive the data-lines without the clock signal applied to the DAC. Apply the clock signal then apply the data on the data-lines. Try this process and see if you are seeing the expected output signal.

Regards,

Neeraj

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DAC5675: Clock requirement