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DAC7554: VDD & REFIN

Priyanshu Vanigota
Prodigy 150 points
Part Number: DAC7554
Other Parts Discussed in Thread: DAC7564, DAC63204, DAC60504

Tool/software:

Hello TI,

Currently I am working on a project that includes an Analog section that requires an Digital to Analog Converter to be interfaced with a microcontroller through SPI communication on 3.3V levels, while Output signals are based on 5V levels. So, after searching for the DAC IC, I thought that DAC7554 could be best option. But, while reading the Datasheet I noticed that VREF cannot be greater than VDD. In my case, VDD = 3.3V and VREF or VIO  = 5V

As an alternate, DAC7564 seems more promising, as it is mentioned in Datasheet that AVdd and IOVdd are separate supply rails. Am I on the right track for selection of DAC IC as per my requirements mentioned above? Or can you suggest any better alternative that perfectly suits my project requirements ?


Awaiting your response.


Thanks,
Priyanshu

  • 0
    TI__Mastermind 42273 points

    Hi Priyanshu,

    DAC7564 will work as you have mentioned. IOVDD can be 3.3V for your 3.3V SPI, and you can use 5V for VDD to achieve your 0V to 5V analog output. 

    I would recommend a newer device like the DAC63204 or DAC60504. DAC63204 can work with as low as 1.8V logic even with a 5V VDD, and DAC60504 has a VIO pin similar to the DAC7564. Both devices have a precision internal reference or allow for an external reference. 

    Best,

    Katlynne Jones