The circuit shown in Figure 1 represents a highly integrated, 16-bit, 1 MSPS, multiplexed, 8-channel digital acquisition system (DAS) that includes an embedded programmable gain instrumentation amplifier (PGIA). This system is designed to handle a wide range of industrial-grade signals with high accuracy and low noise performance. It operates on a single +5 V supply and features a high-efficiency, low-ripple boost converter that provides ±15 V for differential input signals up to ±24.576 V. The system offers a maximum of ±2 LSB INL and typical ±0.5 LSB DNL, making it ideal for precision 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 with high common-mode rejection, and a precision low-drift 4.096 V reference voltage source. It also includes a reference buffer and a high-performance, delay-free SAR ADC. This device is optimized for low-power battery-powered applications, as its power consumption scales linearly with the throughput rate. The ADAS3022 allows flexible configuration of its eight input channels and one COM input, which can be set as eight single-ended channels, four differential channels, or any combination of single-ended and differential inputs. In this design, the ADR434 low-noise reference voltage is buffered by the AD8031 op amp, ensuring stable and accurate reference levels for the system. The ADP1613 DC-DC boost converter supplies the necessary ±15 V for the PGIA without affecting the performance of the ADAS3022. This circuit combines the ADAS3022, ADP1613, ADR434, and AD8031 to deliver high accuracy and low noise, making it suitable for a variety of precision measurement applications. The ADAS3022 simplifies the design process by eliminating the need for signal buffering, level shifting, amplification, and noise suppression typically required in standard solutions. Additionally, it offers better timing and noise performance at higher data rates, reduced size, faster time-to-market, and lower cost. The PGIA within the ADAS3022 supports gain settings of 0.16, 0.2, 0.4, 0.8, 1.6, 3.2, and 6.4, allowing it to handle fully differential input ranges from ±24.576 V down to ±0.64 V. The input range is referenced to the internal 4.096 V reference. The system can measure pseudo-differential, unipolar, and bipolar signals based on the voltage on the COM pin. In this circuit, the external reference is provided by the 4.096 V ADR434, which features high accuracy, low power consumption, low noise, and excellent temperature stability. The ADAS3022's digital interface includes asynchronous control signals such as CNV, RESET, PD, and BUSY, along with a 4-wire serial interface (CS, SDO, SCK, DIN) compatible with SPI, FPGA, or DSP for reading back conversion results and configuring registers.
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