Datasheet AD8479-EP (Analog Devices)

Very High Common-Mode Voltage Precision Difference Amplifier Enhanced Product AD8479-EP FEATURES FUNCTIONAL BLOCK DIAGRAM ±600 V dc common-mode voltage range AD8479-EP Rail-to-rail output REF(–) 1 NC Fixed gain of 1 8 Wide power supply operating voltage 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 80 dB minimum CMRR +IN 3 1MΩ 130 kHz small signal −3 dB bandwidth –V 4 High accuracy dc performance S 5 REF(+) 10 ppm maximum gain nonlinearity 15 µV/°C maximum offset voltage drift
001
NOTES 5 ppm/°C maximum gain drift 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
20677- Figure 1.
ENHANCED PRODUCT FEATURES Supports defense and aerospace applications (AQEC standard) Military temperature range (−55°C to +125°C) Controlled manufacturing baseline One assembly/test site One fabrication site Product change notification Qualification data available on request APPLICATIONS Avionics Unmanned systems High voltage current sensing Motor controls Isolation GENERAL DESCRIPTION
The AD8479-EP is a difference amplifier with a very high input Additional application and technical information can be found common-mode voltage (VCM) range. The AD8479-EP is a in the AD8479 data sheet. precision device that allows the user to accurately measure
800
differential signals in the presence of high VCM up to ±600 V dc.
VS = ±15V 600
The AD8479-EP can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device
400 E (V) G VS = ±5V A
operates over a ±600 V dc V
T
CM range and has inputs that are
200 L
protected from common-mode or differential mode transients
E VO 0
up to ±600 V.
D -MO N –200
The AD8479-EP has low offset voltage, low offset voltage drift, low gain drift, low common-mode rejection drift, and excellent
MMO –400 O C
common-mode rejection ratio (CMRR) over a wide frequency
–600
range.
–800
The AD8479-EP is available in a space-saving 8-lead SOIC package
–20 –15 –10 –5 0 5 10 15 20
002
V
and is operational over the −55°C to +125°C temperature range.
OUT (V)
20677- Figure 2. Input Common-Mode Voltage vs. Output Voltage (VOUT)
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Document Outline Features Enhanced Product Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Outline Dimensions Ordering Guide