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DAC7760: 0V output with unipolar

ttd
Mastermind 7920 points
Part Number: DAC7760

Tool/software:

Dear Technical Support Team,

1. If I’d like to set output 0V (exactly 0V) using the voltage output on the DAC7760, is it necessary to use dual power supplies such as ±15V or ±5V? The voltage output range is 0V-5V.

2. What data sheet specifications should I refer to in order to compare the error relative to 0V for bipolar 0V and unipolar 0V?

Bipolar zero error, zero-scale error, or offset error?

3. Since the headroom is -0.5V, does AVDD need to be 5.5V or more to output 5V? Also, if the footroom is -0.5V, is there a possibility that the output will be -0.5V if ADSS=0V?

Best Regards,

ttd

  • 0
    TI__Expert 4280 points

    Hi,

    1. Using bipolar ranges will give you more footroom to get as close as possible to 0 V output in unipolar mode especially.

    2. For unipolar mode, zero-scale error is most important. Note the footnote saying there was an appropriate footroom VSS supply. For bipolar mode, the bipolar zero error gives the best estimate. Both ranges will be affected by slight gain and offset error, which can be mostly removed by digital calibration. This would be especially important in bipolar ranges for getting as close to 0 as possile.

    3. Yes, you should follow headroom specifications if you are trying to get an accurate lower range output. -0.5 V footroom may be able to be smaller, but that amount is guaranteed to have good performance. What do you mean by ADSS=0V?

    Thanks,
    Lucas