The AD8218 is a high voltage, high resolution current shunt amplifier. It features a set gain of 20 V/V, with a maximum ±0.35% gain error over the entire temperature range. The buffered output voltage directly reflects the input current.
The AD8218 current shunt monitor provides a fixed gain of 20 V/V, zero‑drift performance, and a buffered output suitable for high‑voltage applications. It operates from a common‑mode voltage of 4 V to 80 V and supports bidirectional current sensing up to ±250 mV differential input.
The device is offered in an 8‑lead MSOP package and includes an internal 80 mV reference that can be enabled via the ENB pin. Typical specifications include +100 nV/°C offset drift, 110 dB CMRR, and a 450 kHz small‑signal bandwidth. Absolute maximum ratings allow up to 85 V input and indefinite output short‑circuit duration.
| Gain | 20 V/V |
|---|---|
| Gain Accuracy (typical) | ±0.1 % at 20 V/V |
| Gain Temperature Coefficient | +5 ppm/°C |
| Common‑Mode Input Voltage Range | 4 V to 80 V |
| Differential Input Voltage Range | 0 mV to 250 mV |
| CMRR (typical) | 110 dB |
| Output Voltage Range | 0.01 V to Vs‑0.1 V |
| Small‑Signal Bandwidth (‑3 dB) | 450 kHz |
The AD8218 has a fixed gain of 20 V/V.
The device accepts a common‑mode voltage from 4 V to 80 V.
The AD8218 is offered in an 8‑lead MSOP package.