Datasheet AD8217 (Analog Devices)

High Resolution, Zero-Drift Current Shunt Monitor AD8217 FEATURES FUNCTIONAL BLOCK DIAGRAM High common-mode voltage range R4 AD8217 4.5 V to 80 V operating 0 V to 85 V survival R1 –IN Buffered output voltage OUT Wide operating temperature range: −40°C to +125°C +IN R2 R3 Excellent ac and dc performance LDO ±100 nV/°C typical offset drift ±100 μV typical offset
1
GND
00 1-
±5 ppm/°C typical gain drift
16 09
100 dB typical CMRR at dc
Figure 1.
APPLICATIONS High side current sensing 48 V telecom Power management Base stations Unidirectional motor control Precision high voltage current sources GENERAL DESCRIPTION
The AD8217 is a high voltage, high-resolution current shunt The AD8217 offers breakthrough performance throughout the amplifier. It features a set gain of 20 V/V, with a maximum −40°C to +125°C temperature range. It features a zero-drift ±0.35% gain error over the entire temperature range. The core, which leads to a typical offset drift of ±100 nV/°C buffered output voltage directly interfaces with any typical throughout the operating temperature and common-mode converter. The AD8217 offers excellent common-mode rejection voltage range. Special attention is devoted to output linearity from 4.5 V to 80 V, and includes an internal LDO, which directly being maintained throughout the input differential voltage range powers the device from the high voltage rail. Therefore, no addi- of 0 mV to 250 mV, regardless of the common-mode voltage tional supply is necessary, provided that the input common-mode present, and the typical input offset voltage is ±100 μV. range is 4.5 V to 80 V. The AD8217 performs unidirectional The AD8217 is offered in a 8-lead MSOP package and is current measurements across a shunt resistor in a variety of specified from −40°C to +125°C. industrial and telecom applications including motor control, battery management, and base station power amplifier bias control.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION AMPLIFIER CORE INTERNAL LDO APPLICATION NOTES OUTPUT LINEARITY APPLICATIONS INFORMATION HIGH-SIDE CURRENT SENSING MOTOR CONTROL CURRENT SENSING OUTLINE DIMENSIONS ORDERING GUIDE