A common application for the OPAx205 is an input buffer for the signal chain of a data acquisition (DAQ) or field instrumentation system. This amplifier family is selected because of the low offset and drift that maintain system accuracy across a variety of operating conditions. The low power consumption of the OPAx205 enables the device to be used in battery-operated or high-density applications, where thermal dissipation is difficult. The low 1/f (flicker) noise and broadband noise allow for higher-accuracy signal chains, such as those using a 24-bit delta-sigma analog-to-digital converter (ADC). If a higher sampling rate is needed, the OPAx205 can be paired with a fully differential amplifier, such as the THP210, to drive the ADC inputs. Figure 9-1 shows the OPA2205 configured as an input buffer to a differential ADC driver.

Figure 9-1 OPA2205 Configured as a DAQ Input Buffer