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DAC81408: Regarding the output voltage range

Kyohei
Expert 2076 points

Part Number: DAC81408

Tool/software:

Hi team,

Upon checking datasheet 9.3.1.1, it seems that the output voltage range for each channel can be determined by the register.

When switching the output voltage range for each channel (for example, outputting -10 to 10V, -5 to 5V, and 0 to 40V for different channels), will the voltage conversion accuracy be unaffected even if the power supply voltage is not switched?

In this case, should I input a power supply voltage of -10V to 40V to cover all output voltage ranges and consider the headroom value?

Best regards,

Kyohei

  • +1
    TI__Expert 5710 points

    Hi Kyohei-san,

    All 8 channels of the DAC81408 can be programmed for it's own voltage range individually and it will not affect the accuracy of any channels. There is channel to channel crosstalk  (DC/AC) and only this will be applicable. 

    As there is one high voltage power supply for whole chip and it's common to all the 8-channel output buffer. This means, all the output voltage range needs to be in compliance with the head/foot room spec of the device along with maximum allowed supply voltage. For examples, even though device supports +/-20V and 0-40V voltage. - you will get these outputs simultaneously. Output voltage wii saturate to power rail if you try to programme a voltage range which beyond the head/foot room llimits.

    Thanks,
    Sanjay