SLASEL0B October 2019 – June 2020 DAC11001A , DAC81001 , DAC91001
The bias current mismatch in the output amplifier can lead to offset error at the output. To minimize mismatch, the amplifier must have a matching resistor to that of the R2R output impedance on the feedback path. The feedback resistors are used in parallel for this purpose, as shown in Figure 69. Some amplifiers may become unstable with a feedback resistor in the buffer configuration; therefore, a compensation capacitor (CCOMP) might be needed, as shown. The typical value of this capacitor is in the range of 22 pF to 100 pF, depending on the amplifier.