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DAC7750: MSB and LSB

Ryan Konen56
Prodigy 40 points
Part Number: DAC7750
Other Parts Discussed in Thread: DAC8750,

I'm looking at the datasheet for the DAC7750 and DAC8750 and had a question about Table 13.  For the DAC Data row, which bits are the MSB and LSB?  Can it be assumed that DB4 is the MSB for DAC7750 and DB0 is the MSB for DAV8750?

Thanks!

  • 0
    TI__Expert 5820 points
    Hi Ryan,

    For both devices DB15 is the MSB. DB4 is the LSB for DAC7750 and DB0 is the LSB for DAC8750.

    Thanks,
    Garrett
  • 0 in reply to Garrett Satterfield
    Prodigy 40 points

    Garrett,

    Thanks for the reply!

    From a resolution standpoint, does the DAC7750 have 2^12 = 4096 counts of resolution?.. or does the DAV7750 look at this from a 16-bit perspective and just drop off the 4 LSB bits and have 2^16 = 65536 - 15 counts = 65521 counts?

    The reason I ask is that we are possibly looking at substituting the DAC8750 into a design that has the DAV7750 and trying to see what all would need to be changed to implement this.

    Thanks,

    Ryan

  • 0 in reply to Ryan Konen56
    TI__Expert 5820 points
    Hi Ryan,

    The DAC7750 has a resolution of 2^12 and the DAC8750 has a resolution of 2^16. The transfer functions on page 22 of the datasheet show the current output vs. DAC code for each current output range.

    It should be straight forward to switch from the DAC7750 to the DAC8750 if your application requires a higher resolution. Both devices have the same package options so you can directly swap the devices.

    Thanks,

    Garrett