AWR2243: SYNC_OUT Signal Details

robert hoff

Part Number: AWR2243
Other Parts Discussed in Thread: LMK00804B, MMWCAS-RF-EVM

Hello,

I was wondering if we could get the load characteristics, as well as the expected frequency, wave type, and peak to peak voltage for the SYNC_OUT signal in a cascaded design with more than 2 slave chips. I am not able to find this in the AWR2243 or AWR2243 Cascade datasheets.

Thanks,

Robert

over 5 years ago

0 Cesar over 5 years ago

TI__Guru*** 143584 points

Hi,

We will be able to get back to you tomorrow or early next week

thank you

Cesar

0 robert hoff over 5 years ago in reply to Cesar

Intellectual 390 points

Hi Cesar,

Any update on this question?

Thanks,

Robert

0 Randy Rosales over 5 years ago in reply to robert hoff

TI__Mastermind 18220 points

Hi Robert,

Do you mean the FMCW_SYNCOUT/CLKOUT LO signals? or the DIG_SYNCOUT signals?

Thank you,

-Randy

0 robert hoff over 5 years ago in reply to Randy Rosales

Intellectual 390 points

Hi Randy,

I'm looking at the Digital SYNCOUT signals, which as I understand it, is different than the 40 MHz OSC_CLKOUT. It is shown as "SYNC_OUT and SYNC_IN" in figure 1 of the AWR2243 Cascade Application Report.

Robert

0 robert hoff over 5 years ago in reply to robert hoff

Intellectual 390 points

Hi Randy,

Do you have any update on these signals?

Thanks,

Robert

0 Randy Rosales over 5 years ago in reply to robert hoff

TI__Mastermind 18220 points

Hi Robert,

Syncout (P11) is a GND to VDDIO LVCMOS signal. Based on frame timing, this signal will provide ~6ns wide low-high-low pulse for the slaved cascade devices or other external equipment to synchronize to.

The VOH/VOL numbers in the datasheet reference all of the digital IO on the VIOIN power net including the Syncout pin. So the IOH = 6mA is applicable. In the case of our MMWCAS-RF-EVM we are driving a LMK00804B clock buffer CLK input with Syncout. The LMK00804B datasheet shows the receiver loading for CLK to be 51kohm.

Thank you,

-Randy

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AWR2243: SYNC_OUT Signal Details