Zero Drift, Unidirectional Current Shunt Monitor

The AD8219 is a high voltage, high resolution, current shunt amplifier. It features a set gain of 60 V/V, with a maximum ±0.3% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8219 offers excellent input common-mode rejection from 4 V to 80 V. The AD8219 performs unidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications including motor control, power management, and base station power amplifier bias control.

The AD8219 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 and common-mode voltage range. Special attention is devoted to output linearity being maintained throughout the input differential voltage range, regardless of the common-mode voltage present, while the typical input offset voltage is ±50 μV.

The AD8219 is offered in a 8-lead MSOP package.

Applications

High side current sensing

* 48 V telecom

* Power management

* Base stations

* Unidirectional motor control

* Precision high voltage current sources

* High common-mode voltage range

-- 4 V to 80 V operating

-- -0.3 V to +85 V survival

* Buffered output voltage

* Gain = 60 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