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Inquiry regarding bipolar output configuration of DAC8551

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: DAC8551, OPA703, OPA277

Hello, all

Now we have one inquiry regarding bipolar output configuration of DAC8551 from our customer.

Please refer to the item below, and feedback us with your comment.

When referring "Figure 54. Bipolar Output Range" on datasheet page 19, it seems that only OPA703 is suggested in order to use this device as bipolar output configuration.

Please let us clarify whether we could use other OpAMP for this use case. 

For your reference, we would like to output +/-5V with VREF=5V. Also, we prefer to apply +12V into V+ and -12V into V- of OpAMP if possible. (for this reason we are looking for suit OpAMP.)

We thank you in advance for your information.

Best regards,

  • 0
    TI__Genius 10615 points

    Hello Okui-san,

     

    I would suggest the OPA277. I have personally used it in many DAC applications and it is very versatile.

    To be used with the DAC you need:

    • Low input offset voltage
    • Low input bias current
    • Low drift over temp

    The OPA277 meets all of these specs, plus a wide supply range of ±2 to ±18V.

    The OPA277 has a bandwidth of 1MHz, if your application requires a larger bandwidth I can recommend a different OpAmp.

    Additionally I would like to mention that the external resistors should be well matched. Otherwise this can introduce a significant amount of gain error at the output.