**AD8214ARMZ: A High Common-Mode Voltage, Current-Shunt Monitor**

In the realm of precision electronics, accurately measuring current in the presence of high common-mode voltages is a significant challenge, particularly in industrial automation, motor control, and power management systems. The **AD8214ARMZ from Analog Devices** stands out as a dedicated current-shunt monitor engineered specifically to overcome this hurdle, offering robust performance and reliability in demanding environments.

The core function of the AD8214ARMZ is to **precisely amplify a small differential voltage** developed across a current-sensing shunt resistor, even when this resistor is riding on a high common-mode voltage far exceeding the supply rail of the monitor itself. This device can handle common-mode voltages from **-2V to +65V**, independent of its own supply voltage, which typically operates from a single +3.3V or +5V source. This remarkable capability allows designers to place a shunt resistor directly on high-side rails, such as those found in 48V automotive systems or industrial motor drives, and still obtain an accurate, ground-referenced output voltage that is proportional to the load current.

A key advantage of the AD8214ARMZ is its **integrated architecture**. It combines a precision op-amp with laser-trimmed resistors in a single monolithic IC. This integration ensures excellent **common-mode rejection ratio (CMRR)** of 84 dB (min) across a wide bandwidth, which is critical for rejecting noise and preserving the integrity of the small differential signal. The device provides a fixed gain of 20 V/V, translating a full-scale differential input of 250 mV into a 5V output, making it directly compatible with standard analog-to-digital converters (ADCs).

Furthermore, the AD8214ARMZ is designed for **enhanced stability and low drift**. Its initial gain error is very low at a maximum of ±0.3%, and it features a low offset voltage, which minimizes errors over temperature. The wide operating temperature range of -40°C to +125°C makes it suitable for applications in harsh environments. Packaged in a small MSOP-8 form factor, it offers a compact solution without sacrificing performance.

Typical applications are extensive, including:

* **High-side current sensing** in automotive battery management systems (BMS).

* **Precision motor control** and overload detection in industrial robotics.

* **Power supply management** and load monitoring in server and telecom infrastructure.

* **Solenoid and actuator control** systems.

**ICGOOODFIND**

The AD8214ARMZ is an exceptional solution for high-voltage environments, delivering precision, high CMRR, and robust integration. Its ability to operate with a common-mode voltage up to +65V makes it an indispensable component for designers seeking reliable and accurate current measurement.

**Keywords:**

Current-Shunt Monitor

High Common-Mode Voltage

Precision Amplifier

Common-Mode Rejection Ratio (CMRR)

Current Sensing