**AD7450ABRMZ: A Comprehensive Technical Overview of the 12-Bit, 1 MSPS SAR ADC**

The **AD7450ABRMZ** from Analog Devices represents a high-performance, monolithic 12-bit analog-to-digital converter (ADC) utilizing a successive approximation register (SAR) architecture. Engineered for precision and speed in a compact form factor, this ADC is designed to meet the demanding requirements of a wide array of applications, including medical instrumentation, battery-powered systems, industrial control, and data acquisition systems.

At the core of the AD7450ABRMZ is its **SAR architecture**, which is renowned for its precision and deterministic behavior. Unlike delta-sigma (ΔΣ) ADCs that require a settling time for oversampling, the SAR ADC performs conversions in a single shot, making it ideal for applications requiring rapid, precise acquisitions of transient signals. The device achieves a **high sampling rate of 1 MSPS (Million Samples Per Second)** while maintaining exceptional accuracy, characterized by its **12-bit resolution with no missing codes**. This ensures that every possible digital output code is represented for a corresponding analog input, guaranteeing linearity and precision across the entire operating range.

A key feature of the AD7450ABRMZ is its **low power consumption**, typically drawing just 1.8 mW at 1 MSPS with a 5V supply. This makes it exceptionally suitable for portable and battery-operated equipment where power efficiency is paramount. The power consumption can be further reduced by leveraging the device's flexible power-down modes, which allow the ADC to enter a standby state between conversions, drastically cutting idle current.

The ADC operates with a **single 2.7V to 5.25V supply**, providing design flexibility for both 3V and 5V systems. It features a **pseudo-differential analog input** that helps to reject common-mode noise, a critical capability in electrically noisy environments typical of industrial settings. The input span is configured from 0V to VREF, with an external reference voltage requirement that allows designers to tailor the ADC's dynamic range to the specific needs of the application.

The digital interface is a standard **high-speed serial interface (SPI/QSPI/MICROWIRE/DSP compatible)**, which simplifies connections to microcontrollers, digital signal processors (DSPs), and other logic families. This serial interface minimizes pin count, contributing to the device's compact MSOP-8 package, and is essential for space-constrained PCB designs.

Performance is further underscored by excellent **AC and DC specifications**. The device boasts a typical signal-to-noise ratio (SNR) of **72.5 dB** and total harmonic distortion (THD) of -85 dB, ensuring high-fidelity digital representation of analog signals. The integral non-linearity (INL) and differential non-linearity (DNL) are within ±0.5 LSB, confirming its accuracy.

**ICGOO** In summary, the **AD7450ABRMZ** stands out as a robust and versatile solution for designers seeking a combination of **high speed, exceptional accuracy, and low power consumption** in a small package. Its architectural strengths make it a preferred choice for modern, efficient electronic systems.

**Keywords:** SAR ADC, 12-Bit Resolution, 1 MSPS, Low Power Consumption, SPI Interface.