High Resolution, Zero

-Drift

Current Shunt Monitor

AD8217

Rev. 0

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FEATURES

High common-mode voltage range

4.5 V to 80 V operating

0 V to 85 V survival

Buffered output voltage

Wide operating temperature range: −40°C to +125°C

Excellent ac and dc performance

±100 nV/°C typical offset drift

±100 µV/°C typical offset

±5 ppm/°C typical gain drift

100 dB typical CMRR at dc

APPLICATIONS

High side current sensing

48 V telecom

Power management

Base stations

Unidirectional motor control

Precision high voltage current sources

FUNCTIONAL BLOCK DIAGRAM

LDO

R2

R1

AD8217

R4

R3

+IN

GND

–IN

OUT

Figure 1.

GENERAL DESCRIPTION

The AD8217 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 AD8217 offers excellent common-mode rejection

from 4.5 V to 80 V, and includes an internal LDO, which directly

powers the device from the high voltage rail. Therefore, no addi-

tional supply is necessary, provided that the input common-mode

range is 4.5 V to 80 V. The AD8217 performs unidirectional

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 AD8217 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

of 0 mV to 250 mV, regardless of the common-mode voltage

present, and the typical input offset voltage is ±100 μV.

The AD8217 is offered in a 8-lead MSOP package and is

specified from −40°C to +125°C.