Datasheet AD8479 (Analog Devices)

Very High Common-Mode Voltage Precision Difference Amplifier Data Sheet AD8479 FEATURES FUNCTIONAL BLOCK DIAGRAM ±600 V common-mode voltage range AD8479 Rail-to-rail output REF(–) 1 8 NC Fixed gain of 1 Wide power supply range of ±2.5 V to ±18 V 7 +V 1MΩ S 550 μA typical power supply current –IN 2 Excellent ac specifications 6 OUTPUT 90 dB minimum CMRR +IN 3 1MΩ 310 kHz bandwidth –V 4 S High accuracy dc performance 5 REF(+) ±5 ppm maximum gain nonlinearity ±10 µV/°C maximum offset voltage drift
001
NOTES
18-
±5 ppm/°C maximum gain drift 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
111 Figure 1.
APPLICATIONS High voltage current sensing Battery cell voltage monitors Power supply current monitors Motor controls Isolation GENERAL DESCRIPTION
The AD8479 is a difference amplifier with a very high input
800
common-mode voltage range. The AD8479 is a precision
VS = ±15V 600
device that al ows the user to accurately measure differential signals in the presence of high common-mode voltages up to
400 E (V) G VS = ±5V
±600 V.
A 200 LT
The AD8479 can replace costly isolation amplifiers in applications
E VO 0
that do not require galvanic isolation. The device operates over
D -MO
a ±600 V common-mode voltage range and has inputs that are
N –200
protected from common-mode or differential mode transients
MMO –400 O
up to ±600 V.
C –600
The AD8479 has low offset voltage, low offset voltage drift, low gain drift, low common-mode rejection drift, and excel ent
–800
10 1 common-mode rejection ratio (CMRR) over a wide frequency
–20 –15 –10 –5 0 5 10 15 20
18-
VOUT (V)
111 range. Figure 2. Input Common-Mode Voltage vs. Output Voltage The AD8479 is available in a space-saving 8-lead SOIC package and is operational over the −40°C to +125°C temperature range.
Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. No license is granted by implication or otherwise under any patent or patent rights of Analog Tel: 781.329.4700 ©2013–2021 Analog Devices, Inc. All rights reserved. Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION BASIC CONNECTIONS SINGLE-SUPPLY OPERATION SYSTEM-LEVEL DECOUPLING AND GROUNDING USING A LARGE SHUNT RESISTOR OUTPUT FILTERING GAIN OF 60 DIFFERENTIAL AMPLIFIER ERROR BUDGET ANALYSIS EXAMPLE OUTLINE DIMENSIONS ORDERING GUIDE