AWR2243: Recommendation for better Fanout Buffer for 40 MHz clock and Sync

Ltech

Part Number: AWR2243
Other Parts Discussed in Thread: LMK00804B

Is there a recommendation for better Fanout Buffer perhaps differential clk and single-ended Fanout Buffer for sync in case of cascaded AWR2243 configuration from single master?

I'd like to connect more than 4 AWR2243-s slaves.

Thanks,

Lauri

over 5 years ago

0 Vivek Dham over 5 years ago

TI__Guru 58035 points

Hello Lauri,

On our cascade design () we have used LMK00804B buffer for fanning out the clocks, this supports upto 4 outputs. You can look for similar buffers with more outputs on the TI webpage.

regards,

Vivek

0 Ltech over 5 years ago in reply to Vivek Dham

Intellectual 345 points

Dear Vivek,

The 2:4 used on the TI x4 cascade board has the following spec:

– Additive jitter: 0.1-ps RMS (typical) at 40 MHz

– Output skew: 35 ps (maximum)

– Part-to-part skew: 550 ps (maximum)

What's the tolerance TI considers acceptable for the skew and part-to-part skew spec in a cascade setup?

Thanks,

Lauri

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AWR2243: Recommendation for better Fanout Buffer for 40 MHz clock and Sync