AD8479 Datasheet, PDF (1/16 Pages) Analog Devices – Very High Common-Mode Voltage Precision Difference Amplifier

Data Sheet
Very High Common-Mode Voltage
Precision Difference Amplifier
AD8479
FEATURES
±600 V common-mode voltage range
Rail-to-rail output
Fixed gain of 1
Wide power supply range of ±2.5 V to ±18 V
550 μA typical power supply current
Excellent ac specifications
90 dB minimum CMRR
130 kHz bandwidth
High accuracy dc performance
5 ppm maximum gain nonlinearity
10 µV/°C maximum offset voltage drift
5 ppm/°C maximum gain drift
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
common-mode voltage range. The AD8479 is a precision device
that allows the user to accurately measure differential signals in
the presence of high common-mode voltages up to ±600 V.
The AD8479 can replace costly isolation amplifiers in applications
that do not require galvanic isolation. The device operates over
a ±600 V common-mode voltage range and has inputs that are
protected from common-mode or differential mode transients
up to ±600 V.
The AD8479 has low offset voltage, low offset voltage drift,
low gain drift, low common-mode rejection drift, and excellent
common-mode rejection ratio (CMRR) over a wide frequency
range.
The AD8479 is available in a space-saving 8-lead SOIC package
and is operational over the −40°C to +125°C temperature range.
FUNCTIONAL BLOCK DIAGRAM
AD8479
REF(–) 1
8 NC
1MΩ
–IN 2
+IN 3
1MΩ
–V_S 4
7 +VS
6 OUTPUT
5 REF(+)
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 1.
800
VS = ±15V
600
400
VS = ±5V
200
0
–200
–400
–600
–800
–20
–15 –10
–5
0
5
V_OUT (V)
10
15
20
Figure 2. Input Common-Mode Voltage vs. Output Voltage
Rev. 0
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. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com