**AD7643BCPZ: A Comprehensive Guide to the 18-Bit, 2 MSPS PulSAR® ADC**

In the realm of high-precision data acquisition, the ability to accurately capture real-world analog signals and convert them into a clean digital stream is paramount. The **AD7643BCPZ from Analog Devices** stands as a pinnacle of this technology, an **18-bit, 2 MSPS successive approximation register (SAR) analog-to-digital converter (ADC)** that masterfully balances speed, resolution, and power. This guide delves into the core features, operation, and key applications of this powerful component.

At its heart, the AD7643BCPZ is built on Analog Devices' proprietary **PulSAR® architecture**, a hallmark of precision SAR ADCs. This technology is renowned for its deterministic operation and lack of pipeline delay, making it ideal for control loops and multiplexed systems where a known, fixed latency is critical. The device achieves an impressive **2 million samples per second (MSPS)** throughput while maintaining exceptional 18-bit resolution, ensuring that even the most subtle details of a signal are captured with fidelity.

A key strength of the AD7643BCPZ lies in its outstanding **AC and DC performance**. It offers exceptional signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR), crucial for demanding applications like spectrum analysis and communications. Furthermore, it features **true 18-bit linearity with minimal integral non-linearity (INL) and differential non-linearity (DNL) errors**, guaranteeing accurate conversion across its entire dynamic range.

The ADC integrates several vital components on-chip, simplifying system design. It includes a high-performance, low-noise sampling capacitor, a precision reference buffer, and a versatile serial interface (SPI/QSPI™/MICROWIRE™/DSP compatible). Its operation is flexible, supporting a wide analog input range and both **single-supply (2.5 V) and dual-supply (±2.5 V) operation**, which enhances its adaptability to various system power configurations. Despite its high speed and resolution, the AD7643BCPZ is designed with power efficiency in mind, consuming only 92 mW at 2 MSPS.

**Typical applications** for the AD7643BCPZ are found in the most demanding fields:

* **Precision Data Acquisition Systems (DAS)**

* **Medical Imaging and Instrumentation** (e.g., MRI, ultrasound)

* **High-Speed Automated Test Equipment (ATE)**

* **Spectrum Analysis and Military Communications**

* **Industrial Process Control and Instrumentation**

**ICGOODFIND:** The AD7643BCPZ is a top-tier choice for engineers designing systems where **uncompromising precision, high speed, and excellent dynamic performance** are non-negotiable. Its robust PulSAR® architecture, integrated features, and flexible operation make it a versatile and reliable solution for the most challenging signal conversion tasks.

**Keywords:** **18-Bit ADC**, **PulSAR Architecture**, **2 MSPS**, **High Precision**, **Low Power**