DAC38RF82EVM: What will be the FPGA clock frequency generated by DAC38RF82EVM for FPGA board?

Imran Sheikh31

Part Number: DAC38RF82EVM
Other Parts Discussed in Thread: LMK04828

Hi,

I am trying to understand, what will be the FPGA clock frequency will be generated from EVM card? . if i configure it with following details:

DAC Clock Frequency (MHz): 3000

# of DACs: Single(12bits)

# of IQ pairs per DACs: Real Input

# of SerDes Lanes Per DACs: 4 Lanes

Desired Interpolation: x1

I am not using On-Chip PLL.

Thanks,

Imran

over 4 years ago

0 Kang Hsia over 4 years ago

TI__Guru* 78174 points

Hello,

This depends on the clock mode (CMODE) as described in the datasheet. Assuming you are using CMODE1 with external clock at 3GHz, there is a divide by 4 high speed divider to the LMK04828 chip, and then LMK04828 chip divide by 2 (DCLK1) to the FPGA clock. Therefore, the FPGA clock is 375MHz.

If you are connecting this to TSW14J56/57 EVM, please double check if this clock rate matches the Serdes rate you need per the TSW14J56/57 EVM User's guide

-Kang

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DAC38RF82EVM: What will be the FPGA clock frequency generated by DAC38RF82EVM for FPGA board?