ADC12DJ3200: placement and layout reccomendation

LALIT VERMA

Expert 1635 points

Part Number: ADC12DJ3200
Other Parts Discussed in Thread: LMK04828, LMX2582,

Hi TI,

We will be using three ADC12DJ3200 in our design.

Major components are:

3 ADCs, one LMK04828,one LMX2582, 6 baluns for ADC, power regulators(3 switchers, 8 LDOs) and other passive components.

Below is the image of our planned PCB right now.

Dimensions right now are 190mm*186mm.

FMC+ connector is on top right.

There will be 10 SMA connectors on the front of PCB . 6 for six channel of ADC12DJ3200 and other 4 for clk and trigger signals.

So our queries are:

1. What should be the distance of one SMA to other i.e. distance between one channel of ADC to second channel of ADC for proper isolation.(We will be testing it upto 10Ghz).

2. Can you guys help in the placement of components , like which section of our PCB should we choose for power, which for clocking(LMK,LMX) etc.

3. If we route the JESD signals of ADC in internal layers , can we place components like LDO on the top layer of these traces?

Thanks,

Lalit

over 4 years ago

0 dBrock over 4 years ago

TI__Genius 12780 points

Hi Lalit,

One of our device experts is looking into your question, and will be back with you soon.

Best Regards,

Dan

0 LALIT VERMA over 4 years ago in reply to dBrock

Expert 1635 points

Hi Guys,

Can you please update on this?

Thanks,

Lalit

0 LALIT VERMA over 4 years ago in reply to LALIT VERMA

Expert 1635 points

Hi dBrock,

Please update on this.

We are about to start the placement and routing.It will be better if we can get recommendation from TI.

Thanks,

Lalit

0 dBrock over 4 years ago in reply to LALIT VERMA

TI__Genius 12780 points

Hi Lalit,

Have you had a chance to look at the ADC12DJ3200EVM? This evaluation module can basically be copied in regard to the parts placement and signal routing.

One of our device experts will be back with you soon in regard to your other questions, but if you follow the placement and routing of the EVM, there should be no issues.

Best Regards,

Dan

0 LALIT VERMA over 4 years ago in reply to dBrock

Expert 1635 points

Hi dBrock,

In Eval, only one ADC is used. But in our design we are using three ADCs on single PCB. So please advice us on the placement and other questions we have asked?

Thanks,

Lalit

0 LALIT VERMA over 4 years ago in reply to LALIT VERMA

Expert 1635 points

Hi dBrock,

Any update on this?

We are waiting for the TI support on this to make our design successful.

Thanks,

Lalit

0 dBrock over 4 years ago in reply to LALIT VERMA

TI__Genius 12780 points

Hi Lalit,

Please look at this reference design that utilizes two ADC12DJ3200s. While you are looking to integrate 3 ADCs, this should provide a good feel for component placement.

http://www.ti.com/tool/TIDA-01028

Best Regards,

Dan

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ADC12DJ3200: placement and layout reccomendation