In this application, the input signal ranges from –10 V to +10 V with a frequency of up to 10 kHz. Because of possible portable-use cases for this data acquisition system (DAQ), low power consumption is required to minimize battery drain and thermal dissipation requirements.

To maintain high system accuracy the OPA2205 is selected as input buffers. This device is selected because of the high dc precision (4 µV offset and 0.08 µV/°C offset drift), low flicker noise (0.2 µVpp), and low quiescent current (220 µA). The buffers are followed by a high-precision, fully differential amplifier such as the THP210, which is capable of accurately driving a 24-bit, fully differential ADC such as the ADS127L01.