The AD8031 is ideally suited as a reference buffer because of its ability to drive dynamic loads with fast recovery.

In the circuit shown in Figure 1, the reference is supplied by the ADR434 low noise reference buffered by an AD8031 op amp. The ADAS3022 has eight inputs and a COM input that can be configured as eight single-ended channels, eight channels with a common reference, four differential channels, or various combinations of single-ended and differential channels. The ADAS3022 reduces its power at the end of each conversion cycle therefore, the operating currents and power scale linearly with throughput make it ideal for the low sampling rates in battery-powered applications. The ADAS3022 is a complete 16-bit, 1 MSPS data acquisition system that integrates an 8-channel, low leakage multiplexer a programmable gain instrumentation amplifier stage with a high common-mode rejection a precision low drift 4.096 V reference a reference buffer and a high performance, no latency, 16-bit SAR ADC. In addition, the circuit has high common-mode rejection, eliminating the need for external instrumentation amplifiers, which are typically required in applications where common-mode signals are present. The successive approximation register (SAR)-based data acquisition system includes true high impedance differential input buffers therefore, there is no need for additional buffering, as is usually required to reduce kickback in capacitive digital-toanalog converter (DAC)-based SAR analog-to-digital converters (ADCs).

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