ADC32J44: ADC32J4x flicker noise

Roger Gilbert

Part Number: ADC32J44
Other Parts Discussed in Thread: ADC3244,

Please can I have more details on the flicker noise performance of the ADC32J4x range. My application requires 'full ADC performance' measurements (ie ~-150dBFS/Hz) down to offsets as low as 1MHz. The graphs in the datasheet show a raised flicker noise floor but there is insufficient detail to determine the level / corner frequency or likely performance.

Obviously the ADC3244 has a chopper circuit to move this problem... why is this not present in the ADC32J4x range, they appear to have the same ADC front end or is it much better? Architecturally there is a strong preference for JESD but if necessary I could reluctantly switch to serial LVDS...

Thanks in advance,

Roger.

over 6 years ago

0 Neeraj Gill over 6 years ago

TI__Mastermind 20541 points

Hi Roger,

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

Regards,
Neeraj

0 Matthias Feulner over 6 years ago in reply to Neeraj Gill

TI__Prodigy 240 points

Roger,

it is correct that the ADC32J44 is not supporting the chopper mode feature while the ADC3244 with LVDS interface does. We will be getting back with more details on the flicker noise performance shortly.

Best regards
Matthias

0 jim s over 6 years ago in reply to Matthias Feulner

TI__Guru* 91947 points

Comparison between ADC324x and ADC34J4x.docxRoger,

Attached is some data we collected from both the JESD and LVDS versions of this part.

Regards,

Jim

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ADC32J44: ADC32J4x flicker noise