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ADS54J66: Miscellaneous register setting questions

Kazuhiko Hirano
Genius 15038 points
Part Number: ADS54J66

Hello,

 

My customer has questions about ADS54J66 as follows.

 

Q1

At the step 2 in the Table 72 (Recommended Power-Up Sequence) of the datasheet, “4001h 00h” and “4002h 00h” can be removed, but other sequences are all valid?

 

Q2

When broadcast is disabled (write address 4005h with 01h), how user can specify one of four A, B, C and D, although CH bit can set only two digits, 0 or 1?

 

Q3

When power down by Register 26h bit7=1 and bit6=1, JESD Bank Page register contents are held or cleared/back to default?

 

Best regards,

 

K.Hirano

  • 0
    TI__Guru* 91947 points

    Updated data sheet.pdfHirano,

    Please have the customer reference the updated data sheet that I have attached. This will be releasing in the near future.

    When you power down using register 0x26, the data is held in the JESD Bank Pages.

    You cannot write to individual channels. You can only do them in pairs (A/B and C/D).

    Regards,

    Jim

  • 0 in reply to jim s
    TI__Genius 15038 points

    Jim,

     

    Thank you for your responses, however I am still confused.

     

    1. Even the updated datasheet, still Table 72 includes “address 4001 with 00h” and “address 4002 with 00h”. Those should be removed, right?

    2. Even the updated datasheet, still is says “the device gives flexibility to program each channel individually. To enable individual channel writes, write address 4005h with 01h (default is 00h).”. But do you mean it is not true and you can not write to individual channels regardless of 4005h with 01h or 00h?

     

    Best regards,

     

    K.Hirano

  • 0 in reply to Kazuhiko Hirano
    TI__Guru* 91947 points

    Hirano,

    The wording should be modified. This was copied from another data sheet which only had two channels. This part cannot write to individual channels. When the data sheet mentions each channel, it really means either CHA and CHB or CHC and CHD.

    Table 74 (not 72 as you mention) does not need the writes to address 0x4001 and 0x4000 but doing this does not effect the part.

    Regards,

    Jim