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DAC904: DAC904 OK with 3.3V +VD, 5.0V +VA? performance?

Eric Smith2
Prodigy 40 points
Part Number: DAC904
Other Parts Discussed in Thread: THS5671A

Using the DAC904 with 3.3V +VD and 5.0V +VA doesn't exceed the absolute maximum ratings (+VA to +VD in range -6V to +6V), but will doing so result in satisfactory operation, i.e., performance not worse (or not too much worse) than both supplies being 3.3V? Using a split supply will save me an extra regulator and/or level translator.

  • 0
    TI__Guru* 91947 points

    Eric,

    This is an old legacy Burr Brown device and we do not have any data on this. Since the performance of a DAC is usually based off of the analog section, I would guess the VD = VA = 3V plots would be a good representation of what you would expect to get. If you would like, I can take a measurement for you with our EVM. Just let me know the sample rate and IF rate.

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 40 points
    Hi Jim,

    Thanks for offering to take measurements for me, but rather than have you spend time on that, it looks like I may be better off using the THS5671A instead, since that appears to be designed for VD=3.3, VA=5 operation.

    I was intending to use the differential amplifier circuit in Figure 4 of the DAC904 circuit. That should work OK with the THS5671A, shouldn't it?

    Best regards,
    Eric