DAC38RF80EVM: DAC38RF8XEVM SYSREF polarity

Kazuhiko Hirano

Genius 15078 points

Part Number: DAC38RF80EVM
Other Parts Discussed in Thread: LMK04828

Hello,

At DAC38RF8xEVM, LMK04828 SDCLKOUT3p/n are crossed and connected to DAC38RF8x STSREFN/P.

Is this because those lines are connected straight without not crossing on the PCB?

And SDCLKOUT3p/n polarity are inverse by register setting at LMK04828 internally?

Best regards,

K.Hirano

over 6 years ago

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

Hi Kazuzhiko,

We are looking at your question and will get back to you soon.

Regards,
Neeraj

0 jim s over 6 years ago

TI__Guru* 91947 points

Kazuhiko,

SYSREF was done this way to avoid crisscrossing the traces. The polarity is not inverted in the DAC or LMK. Since the DAC uses the rising edge of SYSREF, this is not issue, as there is only one data converter with this setup.

Regards,

Jim

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DAC38RF80EVM: DAC38RF8XEVM SYSREF polarity