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AWR1843: Question regarding sync options for AWRx sensors

Jeremy Brookley
Prodigy 210 points
Part Number: AWR1843
Other Parts Discussed in Thread: AWR2243, AWR1443, , AWR1243, AWR1642, AWR6843

Hello!

I'm looking at the different AWR chips and trying to determine which one best meets my needs.  I was able to collect most the info I needed from the datasheets but wanted to double check/clarify a few things. 

I'm trying to sync multiple boards together and it appears that only the AWR2243 has the cascade sync support (and has a dedicated cascade board to assist with this), but what I'm currently interested in is which chips/boards support frame sync.  The AWR1243 and AWR1443 both specifically call out that they have frame sync support, I found one forum post that suggests the AWR1843 does support it at the following location:

e2e.ti.com/.../924293

Is someone able to confirm that each of these chips support frame sync?  I assume they do but wanted to confirm before moving forward with this. 

AWR1243 AWR1443 AWR1642 AWR1843 AWR2243 AWR6843
Frame Sync Support Yes Yes ? ? Yes ?
Cascade Sync Support No No No No Yes No

Realistically, the chips I'm looking at are the AWR1643 and the AWR1843 so those are the two I'm most concerned with answering this question for but, at this point, I might as well finish updating my chip comparison chart while I'm at it. 

Any info you can point me to would be greatly appreciated!

  • 0
    TI__Mastermind 31680 points

    Hello Jeremy,

    The SYNC_IN and SYNC_OUT signals can be used for starting the separate chirp timing engines on any of the AWR/IWRx devices. The devices would need to be setup in single-device mode, and hardware triggered. From there, a separate trigger source can be used to hardware trigger all of the devices. The chirps will be synchronous to that trigger, but they will not be in phase since the chirps between devices will be generated from separate VCO. In this configuration, the phase noise between chirps will be quite high. 

    The benefit of cascaded operation is that you are generating the chirp from a SINGLE master device VCO and broadcasting that 20GHz chirp LO across all devices. Since this chirp is generated for all devices from a single VCO, this provides substantial phase noise benefits over separate VCO operation, allowing the devices to perform as a single transceiver. 

    Hope this answers your query. 

    Regards,

    Ishita