The DACx1001 outputs are unbuffered. Use an external op amp to buffer the DAC output. The DAC output voltage ranges from VREFPF to VREFNF. Two gain-setting resistors are integrated in the DACx1001. These resistors are used to scale the DAC output, minimize the bias current mismatch of the external op amp, and generate a negative reference for the REFNF pin. See the Embedded Resistor Configurations section for more information. Table 6 shows the op amp options for the output drive circuit.