ADC3643EVM: Clarification about the REV E schematic

Fabien Berland

Part Number: ADC3643EVM

Hello,

I'm currently trying to configure the ADC3643EVM with a Xilinx ZC702 FPGA.

To do so, I need to use the SDIO_I, SDIO_O, SEN, SDIO_OE and SCLK pins of the FMC connector.

In the schematic provided, these pins are connected to the ADC through resistors R90 to R94 and R96 to R100 must be unsoldered, is this correct?

However, I don't see resistors R90 to R94 on my board, are there any modifications between the gerber and the schematics provided and the current version of my board (REV E)?

And if so, are there any other important modifications to highlight ?

10 months ago

0 Drew Harrell 10 months ago

TI__Intellectual 2280 points

Hi Fabien,

Correct, you would need to use those resistors instead of the default path through the FTDI.

Does the schematic revision you have match the board revision you have?

Best regards,

Drew

0 Fabien Berland 10 months ago in reply to Drew Harrell

Prodigy 90 points

Hi Drew,

No the schematic that I found on the product page (https://www.ti.com/tool/ADC3643EVM) does not match with by board (REV E). And since I'm not getting any response from the ADC when I ask for a reading of the register, I'm wondering whether it' is my code or whether it's because I didn't put these resistors in because I can't see their footprints.

0 Drew Harrell 10 months ago in reply to Fabien Berland

TI__Intellectual 2280 points

Fabien,

Sorry to hear that. We have been working on cleaning some of this up. I will try to find the Rev E schematic so we can figure out what exactly needs to be done to get your setup up and running.

Best regards,

Drew

0 Drew Harrell 10 months ago in reply to Drew Harrell

TI__Intellectual 2280 points

Fabien,

Would you be able to send a high quality picture of the board you have so we can make sure we match the right schematic?

Best regards,

Drew

0 Fabien Berland 10 months ago in reply to Drew Harrell

Prodigy 90 points

Yes, here it is :

Let me know if the quality is not enough ....

Fabien ,

0 Drew Harrell 10 months ago in reply to Fabien Berland

TI__Intellectual 2280 points

Fabien,

Thank you. What would also help is if you could get just what is in the yellow rectangle (front and back of board) as this is where a good portion of the FTDI circuitry is.

Best regards,

Drew

0 Fabien Berland 10 months ago in reply to Drew Harrell

Prodigy 90 points

0 Fabien Berland 10 months ago in reply to Fabien Berland

Prodigy 90 points

Hi Drew,

As far as I can see, the resistors used to connect the SDIO pins of the FMC connector are in the same position as in the Gerber file you provide on your site, but they don't have the same name.
On my evalboard, the name of these resistors is R96, R97.... R100

Regards

+1 Drew Harrell 10 months ago in reply to Fabien Berland

TI__Intellectual 2280 points

Hi Fabien.

Sorry for the delay. Yes, I believe the layout is the same but component values are different.

This should be the schematic that goes with the board that you have:

DC104-002_ADC3643_REVE_Sch.PDF

Best regards,

Drew

0 Fabien Berland 10 months ago in reply to Drew Harrell

Prodigy 90 points

Hi Drew,

This schematic seems more coherent with my board.

Thank you

Fabien

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ADC3643EVM: Clarification about the REV E schematic