AWR1243: 20 GHz LO Sync Pins Connectivity

min hu

Part Number: AWR1243

Hi,

according to SWRA574A two combinations of Pins is used in 20GHz LO,For the convenience of PCB layout I did not follow the recommended Pin connectivity:Master LO output use "FM_CW_SYNCOUT" and LO input use "FM_CW_SYNCIN1" for both master and slave,will this degrade Awr1243 performance?

how can i choose and set the LO input/output Pin(enable,disable )?

Best Regards,

over 5 years ago

0 min hu over 5 years ago

Intellectual 990 points

I read on the forum that:'FM_CW_SYNCIN2' is not supported in DFP?

0 Vivek Dham over 5 years ago in reply to min hu

TI__Guru 58035 points

Hello Min,
You can use either FM_CW_SYNCIN1 or FM_CW_SYNCIN2 , both are always enabled and both would work. You need to terminate the unused SYNCIN pin to GND.
Regarding the 20Ghz o/p pins, the reason we use both FM_CW_SYNCOUT and FM_CW_CLKOUT is because we need to drive 4 devices. Using a single pin to supply all 4 devices would reduce the SYNIN signal level reaching the devices. If you are using only 2 chip cascade then only one of the pins is sufficient.

Regards,
Vivek

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AWR1243: 20 GHz LO Sync Pins Connectivity