ADS54J66: ADS54J66 FS / 4 "phase" ambiguity between channels

Troy Robinson

Part Number: ADS54J66

We are utilizing all 4 channels of the ADS54J66 device in DDC mode with FS/4 and decimation by 2.

We see a phase ambiguity between channels that changes randomly after reset. Is the FS/4 "phase" deterministic between channels A, B, C, D if each channel is set to the same DDC mode?

Please let me know.

Thanks,

Troy

over 6 years ago

0 jim s over 6 years ago

TI__Guru* 91947 points

Troy,

They should be deterministic. Are you using subclass 1 mode? Is the device meeting common mode, p-p swing, and setup and hold times for SYSREF?

Regards,

Jim

0 Troy Robinson over 6 years ago in reply to jim s

Prodigy 80 points

I will ensure that the sysref signal is being generated properly. I'll let you know what I discover. Thanks, Troy

0 Troy Robinson over 6 years ago in reply to Troy Robinson

Prodigy 80 points

Yep, it was a sysref pulse issue. We applied the sysref properly, and now all lanes are aligned correctly. Thanks for your help. Troy

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ADS54J66: ADS54J66 FS / 4 "phase" ambiguity between channels