ADS42LB69: request for design review

ranjini r

Prodigy 150 points

Part Number: ADS42LB69

Hi,

Can you please review the attached design and suggest if any changes to be made?

Input range 7dBm, 50 ohms impedanceADC_1.pdf

over 2 years ago

+1 jim s over 2 years ago

TI__Guru* 91947 points

Ranjini

The schematic looks good. I would suggest removing two of the four decoupling caps on the NB_ADC_AVDD_3V3 pins since there are only 2 input pins. Same with NB_ADC_DVDD_1V8 (remove the extra one). For all three power buses, I would add a bulk capacitor (10uF) and try to place these close as possible to the pins.

Regards,

Jim

0 ranjini r over 2 years ago in reply to jim s

Prodigy 150 points

Hi,

In the current design, I'm having a single ground reference.

Should I consider any ground isolation for analog & digital section of ADC?

Regards,

Ranjini.R

0 jim s over 2 years ago in reply to ranjini r

TI__Guru* 91947 points

Ranjini,

I would suggest using a single ground plane and isolate the sensitive analog traces from the high speed digital traces. See the attached document for more guidelines.

Regards,

Jim

4530.Schematic and Layout tips.ppt

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ADS42LB69: request for design review