ADC12DJ3200: Over-range bits after decimation

Cameron Grant14

Part Number: ADC12DJ3200

Hello,

I'm curious about what exactly the over-range bits denote after filtering and decimation. I understand they are set when samples are compared against OVR_T0 and OVR_T1. After the original indicators are calculated, how are they handled when going through the FIR and through decimation for JMODE16? How many over-range samples in a filter window trigger an over-range on the output of the filter? How many in the decimation window trigger an over-range indicator on the output of decimation?

What happens to over-range samples before the filter? Are they saturated at the max values, or wrapped around?

Thanks,
Cam

over 6 years ago

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

Hi Cameron,

We are looking at your question and will get back to you soon.

Regards,
Neeraj

0 Jim Brinkhurst1 over 6 years ago in reply to Neeraj Gill

TI__Mastermind 44680 points

Hi Cam
The OVR bit results are fed directly from the over-range processing block to the JESD204 transport layer, bypassing the DDC. The upper 15-bits of each complex data value are provided from the output of the DDC, while the lsbs are provided from the over-range processing block.
The over-range processing is as stated in datasheet Section 7.3.2.3 ADC Over-Range Detection.
I hope this is helpful.
Best regards,
Jim B

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ADC12DJ3200: Over-range bits after decimation