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DAC3482: Differential Mode with EVM

Ohad Bonneh
Intellectual 1980 points
Part Number: DAC3482
Other Parts Discussed in Thread: DAC3484

Tool/software:

Hi Team, 

For evaluating the DAC3482 I am using the EVM but its has only single ended output, 

Is it possible to work in diff mode? 

1. Please advise how to install the "DNI" resistors in order to work at differential mode?

2. Connectors to j1,j4,j5,j8 are not installed on this evaluation board, Which one of the connectors do I need to use?

3. Do I need to remove the baluns? Which one?

4. Please advise how to implement the LPF for cutoff of 260MHz (what values need be for the cap/ind)? Do TI have a Filter simulator design tool for this?

5. how can I test the power consumption of the DAC at the following conditions:  Fsamp=1GHz Interpolation factor=2 , NCO and PLL are off?

 thanks! 

  • 0
    TI__Guru* 79214 points

    Hi Ohad,

    For #1 to 3, you can see section 4 of below app note will help you understand the setup:

    https://www.ti.com/lit/ug/slua647a/slua647a.pdf

    The resistor network will depend on the final load impedance as well. Therefore, you will need to take the load information under consideration

    For #4, you can find reference TINA files. Any type of filter design tool can help with with design as long as you specify source and load impedance of the filter.

    DAC348x_TRF3705.TSC

    For #5, you will need to connect series current meters with the DC/DC power supplies and LDOs on the board for measurements on the DAC itself. This is quite involving on the board modificaitons. I would recommend that you reference the customer to the datasheet as a guideline. 

  • 0 in reply to Kang Hsia
    TI__Intellectual 1980 points

    Hi Kang, 

    I made some changes in the pcb  of the evaluation board in order to work in a differential configuration:

    The generated signal is directed only to J1 and J2. How to configure  the software in order to send the signal also to J3 and J4?

     

    thanks! 

  • 0 in reply to Ohad Bonneh
    TI__Guru* 79214 points

    Hi Ohad,

    DAC3482 is only available in 2 channels (Ch B and Ch C of the DAC3484). Other channels are not bonded out from the silicon to the package pin.