• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 275 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DAC8871: Does it support +/-1.5V bipolar output?

Chase Jeong
Mastermind 6150 points
Part Number: DAC8871
Other Parts Discussed in Thread: DAC80501, DAC8728, DAC7632

Hello TI experts,

my customer consider DAC8871 for their product, and it should be support bipolar output.

actually the power source is coin battery. so operating voltage is very low. (about 3.0V)

and they want to +/-1.5V bipolar output. unfortunately i cannot find the contents in datasheet.

can you verify DAC8871 which can support +/-1.5V bipolar output? if no, please recommend other IC for it.

please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Guru 53623 points

    Hi Chase,

    The device could accept a ±1.5V reference, but the device requires a relatively high VCC and VSS voltage (13.5V minimum).  So you probably want to look at one of our low voltage devices and then apply an amplifier output to make it bipolar.  For example, consider the DAC80501+amplifier.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Mastermind 6150 points

    Hi Paul,

    Thank you for your advice.

    i found another device, but i don't know whether i ask in this thread or create another. anyway i ask in this thread now.

    1. DAC8728 - what is the minimum AVDD/AVSS/DVDD voltage to get +/-2.0V bipolar output?

    and can I use 3.3V IOVdd for spi communication? (host use 3.3V IO pins.)

    2. DAC7632 - should I put +/-5.0V for VDD/VCC/VSS even I want +/-2.5V bipolar output?

    and different from DAC8728, it seems that I cannot control the level of communication line. as i said the host use 3.3V IO pins. is level shifter necessary for this situation?

    Please check this issue. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 53623 points

    Hi Chase,

    1.  The device requires a minimum of ±5V for operation.  The minimum reference voltage is 1V, which should work for you.  It can support 3.3V logic.

    2. The DAC7632 requires ±5V supplies for operation, even with a lower reference voltage. The device does not support 3.3V logic.

    Thanks,

    Paul