DAC3482EVM: CDCE62005 setting

Kei Kuwahara

Expert 5550 points

Part Number: DAC3482EVM

Hello team,

I am using DAC3482EVM with TSW1400EVM.

On the p.9 of the DAC348xEVM user's guide, it says,

Y3: FPGA Clock 1. This clock is an ac coupled LVDS. The clock rate for this should be

– FDAC/interpolation/2 for DAC3484

– FDAC/interpolation/4 for DAC3482, DAC34H84, and DAC34SH84

What does /4 mean?

Does "interpolation/4" mean that clock divider of FPGA clock on TSW1400 should be set to 4?

Best Regards,

Kei Kuwahara

over 1 year ago

0 Kang Hsia over 1 year ago

TI__Guru 69994 points

Hi Kei,

The /4 means divide by 4. It is the necessary clock divider needed from the CDCE62005 or any clocking circuits needed to generate the FPGA clock for the TSW1400 to generate the proper signal for the DAC3482.

-Kang

0 Kei Kuwahara over 1 year ago in reply to Kang Hsia

TI__Expert 5550 points

Hello Kang-san,

Thank you for such a quick reply!!!

So, just to confirm, it means that I should set the CDCE62005 divider to 4 and feed the output clock to the FPGA on TSW1400 right?

Best Regards,

Kei Kuwahara

0 Kang Hsia over 1 year ago in reply to Kei Kuwahara

TI__Guru 69994 points

Kei,

Please refer to the user's guide. I am referring to the following divider:

You have to include interpolation factor also.

0 Kei Kuwahara over 1 year ago in reply to Kang Hsia

TI__Expert 5550 points

Hello Kang-san,

I see, I have to include the interpolation factor.

So is this mean that I need to use the equation FDAC/interpolation/4 to calculate the input frequency for the FPGA, and set the CDCE62005 divder value accordingly to meet the calculated frequency?

OR just need to set the divider to 4 regardless of the FDAC or interpolation factor.

Best Regards,

Kei Kuwahara

+1 Kang Hsia over 1 year ago in reply to Kei Kuwahara

TI__Guru 69994 points

Hi Kei-San

Kei Kuwahara said:
So is this mean that I need to use the equation FDAC/interpolation/4 to calculate the input frequency for the FPGA, and set the CDCE62005 divder value accordingly to meet the calculated frequency?

The above is correct

0 Kei Kuwahara over 1 year ago in reply to Kang Hsia

TI__Expert 5550 points

Hello Kang-san,

Thank you for the answer!

Now I understood.

Best Regards,

Kei Kuwahara

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DAC3482EVM: CDCE62005 setting