**AD7485BSTZ: 16-Bit, 250 kSPS SAR ADC for Precision Data Acquisition Systems**

In the realm of precision data acquisition, the integrity of the analog-to-digital conversion process is paramount. The **AD7485BSTZ from Analog Devices** stands as a pivotal component, engineered to deliver exceptional performance in systems where accuracy and speed are critical. This 16-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) combines high resolution with a rapid conversion rate, making it an ideal solution for a wide array of demanding applications.

The core of the AD7485BSTZ's performance lies in its **inherent SAR architecture**, renowned for its precision and deterministic behavior. Unlike delta-sigma (ΔΣ) ADCs, which can introduce latency due to their filtering process, the SAR ADC provides an immediate digital output after each conversion. This feature is indispensable in multiplexed systems or control loops where **low latency and fast response times** are non-negotiable. The device's 250 kSPS throughput ensures that even rapidly changing signals are captured with high fidelity.

A key attribute of this ADC is its **exceptional DC precision**. With a typical integral nonlinearity (INL) error of ±0.5 LSB and a signal-to-noise ratio (SNR) of 91 dB, the AD7485BSTZ guarantees that the digital output is a highly accurate representation of the analog input. This level of precision is crucial for applications such as medical instrumentation, scientific measurement, and industrial process control, where minute signal variations carry significant information.

The device is designed for ease of integration and robust operation. It operates from a single 5 V power supply and features a versatile **serial interface that is compatible with SPI, QSPI, and MICROWIRE protocols**, simplifying communication with a host microcontroller or DSP. Its power dissipation is a low 15 mW at 250 kSPS, which scales down with reduced throughput, making it suitable for power-sensitive applications. The AD7485BSTZ is offered in a compact 48-lead LQFP package, ensuring a small footprint on a PCB.

Typical applications that benefit from its capabilities include:

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

* **Data Acquisition Systems (DAQ)**

* **Medical Imaging and Patient Monitoring**

* **Spectrum Analysis and Communications Infrastructure**

* **Precision Industrial Control Systems**

**ICGOOODFIND:** The AD7485BSTZ is a high-performance 16-bit SAR ADC that masterfully balances speed, precision, and power efficiency. Its robust architecture and excellent DC specifications make it a superior choice for designers building next-generation precision data acquisition systems that cannot compromise on accuracy or responsiveness.

**Keywords:** **16-Bit Resolution**, **250 kSPS**, **SAR ADC**, **Precision Data Acquisition**, **Low Latency**