**AD7945BRSZ: A 14-Bit, 250 kSPS Pseudo-Differential SAR ADC for Precision Data Acquisition Systems**

In the realm of precision data acquisition, the choice of an Analog-to-Digital Converter (ADC) is paramount, defining the system's ultimate performance in terms of accuracy, speed, and power efficiency. The **AD7945BRSZ from Analog Devices** stands out as a compelling solution, engineered to deliver high-resolution conversions in a compact, low-power package. This 14-bit, 250 kSPS successive approximation register (SAR) ADC is specifically designed for applications demanding **exceptional precision and robust performance** in challenging environments.

At the heart of the AD7945BRSZ is a highly stable SAR architecture, renowned for its **deterministic operation and low latency**. Unlike delta-sigma (ΔΣ) ADCs that require filter settling time, the SAR architecture provides a single conversion result per clock cycle, making it ideal for multiplexed applications and control systems where a rapid response to changing input signals is critical. The device's **pseudo-differential input** structure offers a excellent balance between performance and simplicity. It effectively rejects common-mode noise, which is a common challenge in industrial settings, while simplifying the front-end design compared to a fully differential setup. The analog input range is configurable between 0 V to VREF or 0 V to 2 × VREF via a separate supply pin (VREF), providing design flexibility for various sensor interfaces.

Power consumption is a crucial metric for portable or battery-operated instruments. The AD7945BRSZ excels with its **ultra-low power dissipation**, consuming a mere 5.5 mW at 250 kSPS and scaling down linearly with the sampling rate. This feature, combined with its tiny 3 mm × 3 mm LFCSP package, makes it a perfect fit for space-constrained and power-sensitive designs. Furthermore, the ADC incorporates a powerful, flexible serial interface that is compatible with both SPI, QSPI, MICROWIRE, and DSP protocols, ensuring easy connection to a wide range of microcontrollers and digital processors.

The combination of high accuracy (with excellent INL of ±0.4 LSB typical), fast throughput, and low power makes the AD7945BRSZ a versatile component across numerous sectors. It is particularly well-suited for **precision data acquisition systems, battery-powered equipment, medical instrumentation, industrial process control, and seismic monitoring systems**.

**ICGOOODFIND**: The AD7945BRSZ is a superior 14-bit SAR ADC that masterfully combines high-speed precision, ultra-low power operation, and a flexible interface in a minuscule form factor. Its pseudo-differential input and outstanding ac/dc performance make it an indispensable component for designers tackling the most demanding data conversion challenges.

**Keywords**: **SAR ADC**, **Pseudo-Differential Input**, **Ultra-Low Power**, **14-Bit Resolution**, **Precision Data Acquisition**.