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DAC53204: VOLTAGE LEVEL TRANSLATION

SATHYA SHREE S
Intellectual 540 points
Part Number: DAC53204
Other Parts Discussed in Thread: TCA39306, PCA9306,

Hi,

To perform voltage margining through DAC53204RTER. We have used MUX with I/O voltage of 1.8V to drive the I2C lines of DAC. DAC's I/O voltage is 5V.

We are planning to use I2C level shifter with smaller footprint/package. We found the parts TCA39306 and PCA9306.

Please let us know which level shifter can be used from the above two parts.

Also attaching the design for your reference.

 

Thanks

S Sathya shree

  • 0
    TI__Mastermind 25793 points

    Hello,

    The level translator should not be required. When I2C is used the logic level is set by the external pullup resistors. The DAC will function with any logic level as long as the VIH and VIL meet the following requirements:

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    TI__Mastermind 25793 points

    To elaborate, the logic level of the DAC does not need to match the VDD supply for the DAC.

  • 0
    TI__Genius 16520 points

    Hi Sathya,

    I agree with Katlynne's comment here- a translator won't be needed in this use case as the 1.8V signals will satisfy the VIL/VIH requirements of the DAC. For communication from DAC back into the MUX side, this will also be acceptable since the TCA9544 will be capable of down translating the 5V signals back into 1.8V logic (please see figure 15 for example use case). 

    Regards,

    Jack 

  • 0 in reply to Jack Guan
    Intellectual 540 points

    Hi Guan,

    Thanks for your reply. I understood that DAC53204 can be operated without the need of level translator but since we are designing a electrical validation board for ASIC, we would like to maintain the voltage level compatibility and constraint for proper operation inorder to avoid risk. So, we are planning to use PCA9306. Can we go with this part?

    Thanks

    S Sathya shree

  • 0 in reply to SATHYA SHREE S
    TI__Genius 16520 points

    Hey Sathya,

    The TCA9544 is capable of translating signals already by pulling R3P4 and R3P10 up to 5V instead of 1.8V:

    By adding the PCA9306, this will take up extra board space and add additional prop delay. It will work, but the PCA9306 isn't necessary in your application.

    Regards,

    Jack