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Original question:

ADC32RF45EVM: Undocumented low level register writes with ADC32RFXX EVM GUI

ADC32RF45EVM: Register settings for bypass mode and DDC usage

Channamallesh Hiremath
Intellectual 555 points
Part Number: ADC32RF45EVM

Hello,

I am trying to setup ADCRF45 device in bypass mode. I am going through the instructions in user manual. In figure 4 of section 3.2, you show the DDC configurations. Why do we need to setup DDC. I thought DDC is bypassed in this case.

Can you please clarify?

If it is required, what those numbers really mean? 

Thank you.

Mallesh

  • 0
    TI__Genius 10235 points

    Hi Mallesh,

    Wrong GUI snapshot is used as figure 4 in section 3.2 by mistake. However the instructions in the section are correct. 

    The correct snapshot is below. Please use this as reference to configure the ADC in bypass mode. 

    Regards,

    Vijay

  • 0 in reply to Vijayendra Varma Siddamsetty
    Intellectual 555 points

    Thank you Vijay for your quick reply.

    I have another question regarding register writes.

    Register writes recorded by evm programming are as follows. 

    Write Register: ADC32RFxx_DIGITAL.JESD DIG CHB 0x02 0x690002 0xF
    Write Register: ADC32RFxx_DIGITAL.JESD DIG CHA 0x02 0x1690002 0xF

    For this example writes, 

    In my own driver, 

    Do I need to write the following,

    0x4001     0x00

    0x4002     0x00

    0x4003     0x00

    0x4004     0x69

    0x6002     0xF              // write for channel A

    0x7002    0xF               // write for channel B

    Is this correct? THis applies only to JESD page.

    For all other digital pages, I need to change 0x4003 to 0x1 for selecting channel B. Is that correct?

    Please let me know.

    Thanks,

    Mallesh

  • 0 in reply to Channamallesh Hiremath
    TI__Genius 10235 points

    Hi Mallesh,

    Sorry for the delay. I missed this post as it was marked as 'resolved'. 

    Your understanding of digital page selection is correct. The same is explained in section 8.4.3.3 of datasheet for your reference. 

    Configuration files for ADC32Rfxx devices are also available at this link: www.ti.com/.../SBAA226

    Regards,

    Vijay