The AD8218 is a high-voltage, high-resolution shunt amplifier. It has excellent input common-mode rejection performance and can be used to measure bidirectional currents across a shunt resistor in a wide variety of industrial and telecom applications, including motor control, battery management, and base station power amplifier bias control.
The AD8218 is a high‑voltage, high‑resolution shunt amplifier with a fixed gain of 20 V/V. It operates over a wide common‑mode voltage range (4 V to 80 V) and temperature range (‑40 °C to +125 °C), offering low offset and drift suitable for precision current sensing in industrial and telecom applications.
The document lists detailed electrical specifications, absolute maximum ratings, pin‑out for the 8‑lead MSOP package, and typical performance curves. Application notes cover single‑ended and bidirectional current measurement, motor‑control current sensing, and power‑amplifier biasing. This manual is written in Chinese.
| Gain (initial) | 20 V/V |
|---|---|
| Gain accuracy over temperature | ±0.35 % |
| Common‑mode rejection ratio (CMRR) | 110 dB (typical) |
| Input common‑mode voltage range | 4 V to 80 V |
| Supply voltage (Vs) range | 4.5 V to 5.5 V |
| Absolute maximum input voltage | -0.3 V to 85 V |
The AD8218 has a fixed gain of 20 V/V.
It supports an input common‑mode voltage range from 4 V to 80 V.
The typical common‑mode rejection ratio is 110 dB.
The absolute maximum input voltage is –0.3 V to 85 V.