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DAC1282: Minimum load connection

Willem van der Kooij
Prodigy 135 points
Part Number: DAC1282


Hi,

When connecting the minimum output load of the DAC as recommended for THD improvement (figure 26 of the datasheet) how should the resistive load be connected?

a) By placing a resistor between the output pins (VOUTP and VOUTN)
b) By placing resistors from both output pins to the ground reference
c) By placing resistors from both output pins to a voltage equal to Vcom


The datasheet doesn't specify placement on this issue and I'm not sure (although i suspect it's either a or c).

Thanks in advance!
Willem

  • 0
    TI__Mastermind 44720 points
    Hi Willem,

    I checked with a characterization engineer and they said that the THD was tested with a differential resister between the DAC outputs (configuration A).

    However, if you provided the same load to each input in configuration B or C you should probably get the same THD performance... Between configuration A and B, you have twice the voltage across the differential resistor than you would a resistor from either output to ground, so 1k differential resistor should be equivalent to two 500 Ohm resistors connected to ground (assuming GND is the common-mode voltage in both cases, so AVDD = 2.5V; AVSS = -2.5V)