ADI AD8218BRMZ

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 interfaces with any typical converter. The AD8218 offers excellent input common-mode rejection from 4 V to 80 V. The AD8218 performs bidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications, including motor control, battery management, and base station power amplifier bias control. The AD8218 offers breakthrough performance throughout the -40°C to +125°C temperature range. It features a zero-drift core, which leads to a typical offset drift of ±100 nV/°C throughout the operating temperature range and the common-mode voltage range. Special attention is devoted to output linearity being maintained throughout the input differential voltage range of 0 mV to ~250 mV. The AD8218 also includes an internal 80 mV reference that can be enabled for optimal dynamic range in unidirectional current sense applications. The typical input offset voltage is ±50 μV. The AD8218 is offered in an 8-lead MSOP package and an 8-lead LFCSP package.

• High common-mode voltage range 4 V to 80 V operating -0.3 V to +85 V survival
• Buffered output voltage
• Gain = 20 V/V
• Wide operating temperature range: -40°C to +125°C
• Excellent ac and dc performance ±100 nV/°C typical offset drift ±50 μV typical offset ±5 ppm/°C typical gain drift 110 dB typical CMRR at dc

• High-side current sensing
• 48 V telecom
• Power management
• Base stations
• Bidirectional motor control
• Precision high voltage current sources