• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 395 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC3484: Dual channel mode

Dimitar Penev
Intellectual 600 points

Part Number: DAC3484
Other Parts Discussed in Thread: DAC3482,

Hi Guys,

We have a custom board which can accept both DAC3484 or DAC3482 components on the same footprint. (so we get 4 or 2 channels)
DAC3484 has channels A, B, C and D
DAC3482 has channels I and Q

From the pin out perspective I maps with B and Q maps with C. 

From the register perspective I maps with A and Q maps with B.
Why I say that?
(Well for example DAC3482 register 0x0C is qmc_gainI  and DAC3484 register 0x0C is qmc_gainA , etc)

If I enable dual channel mode for DAC3484 it seems the chip behaves exactly as DAC3482
Is this true?
It would mean that the complete register layout of DAC3484  changes, which is not what I would expect. 

Can someone comment this please?

Thank you!
Dimitar

  • 0
    TI__Guru* 83035 points

    Hi Dimitar,

    Your observation is correct. When the dual channel mode of DAC3484 is programmed, the DAC3484 turns into a DAC3482 equivalent. The output pins of the DAC and also the programming registers (as you have observed) will need to follow the guidelines of the DAC3482 datasheet.


    in summary: the output of the DAC3484 in dual mode (DAC3482 mode) has output pins channel B/C active. However, the QMC correction registers will be in effect as the DAC3482 datasheet with respect to I and Q signal.


    -Kang