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DACs chip selection

jerry chang
Prodigy 70 points
Other Parts Discussed in Thread: DAC8830

Hi, all

In order to make some adjustment, I need to generate a periodic(40Hz) signal with very low amplitude( 0.6mV ~ 10mV)

Is it possible to use DAC chip ? or any recommend will be very appreciate!!

Thank you!!

  • 0
    TI__Genius 14220 points

    Hi Jerry,

    Thank you for your query. A 40Hz signal can be generated using almost any precision DAC. However, your amplitude requirement is close to the zero scale. Hence, could you provide some more details so that we can suggest the best part for the specs:

    1. Resolution

    2. Can you use bipolar output?

    3. What is the application and what load the DAC might be driving?

    4. Do you have any THD requirements?

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC

  • 0 in reply to Uttam Sahu
    Prodigy 70 points

    Hi Uttam,

    Thank you for your reply.

    I would like to generate the signal as the figure below, peak-peak amplitude is about 1.9-1.8994 = 0.6mV and 40Hz frequency. The requirement is to simulate the voltage signal during impedance measurement  by BMS(battery monitoring system). My goal is to do the impedance adjustment.

    1. Resolution

    Can generate the delta-V from 0.6mv - 10mv, i think 16 bits 2.5V DAC maybe OK.

    2. Can you use bipolar output?

    No, in order to meet the existing circuit design, there is no negative Vcc.

    3. What is the application and what load the DAC might be driving?

    There is a differential amplifier circuit for voltage sampling at the DAC output, so i think there is no driving issue.

    4. Do you have any THD requirements?

    NO

  • 0 in reply to jerry chang
    TI__Genius 14220 points

    Hi Jerry,

    Apologies for the delay in response. You can look at DAC8830. If you choose zero-drift precision amplifiers, you should be able to get accuracy near the zero scale.

    Hope that answers your question. Let me know if you have further questions.

    Regards,

    Uttam