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Preliminary Data Sheet
FEATURES:
High Common Mode Input Voltage Range -2V to 65V operation -5V to 70V survival Operating Temperature Range: Die: -40 C to 150 C 8 Pin SOIC: -40 C to 125 C Adjustable Offset Gain = 50 EXCELLENT AC and DC PERFORMANCE 20 V/C Offset Drift 20ppm/ C Gain Drift 80dB CMRR Min DC to 10kHz APPLICATIONS High Side Current Sensing Motor Control Transmission Control Diesel Injection Control Engine Management Suspension Control Vehicle Dynamic Control 42V DC/DC Converter Current Sensing
GENERAL DESCRIPTION The AD8205 is a single supply difference amplifier for amplifying voltages in the presence of a large common mode voltage. The input CMV range extends from -2V to 65V at a typical supply voltage of 5V. The AD8205 is offered in die and packaged form. The operating temperature range for the die is 25C higher (up to 150C) than that of the packaged part to enable the user to apply the AD8205 in high temperature applications.
+IN -IN
8
Single Supply 42V System Difference Amplifier
AD8205
V+
6
5 1
OUT
AD8205
7 VREF 1
NC 4
3 V REF 2 2
GND
CONNECTION DIAGRAM
Available in SOIC and Die form
Excellent DC performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is less than 20 V/C, and Gain Drift is below 30ppm/C up to 125C. The offset can be adjusted from 0.05V to 4.8V using the Vref 1 and Vref 2 pins. With Vref 1 attached to the V+ pin, and Vref 2 attached to the GND pin, the output will be at half scale. Attaching both pins to GND will cause the output to be unipolar, starting near ground. Attaching both pins to V+ will cause the output to be unipolar starting near V+. Other offsets can be obtained by applying an external voltage to the Vref 1 and Vref 2 pins.
REV. PrJ 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. 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 companies.
1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data
AD8205 - SPECIFICATIONS
Parameter
(TA = 25C, VS = +5V, VCM = 12V unless otherwise noted)
AD8205
AD8205 SOIC AD8205 DIE
Min Typ 50 1 1.2 20 2 4.5 20V/C 30V/C 30 1 % 1.3 % ppm/C 2.5 mV 6 mV Max Units Min Typ 50 Max
Conditions
GAIN Initial Accuracy VO 0.1V DC Accuracy Over Temperature Specified Temperature Range Gain vs. Temperature VOLTAGE OFFSET Offset Voltage (RTI) Over Temperature (RTI) Offset Drift INPUT Input Impedance Differential Common Mode Input Voltage Range Input Voltage Range Common Mode Rejection Ratio Common Mode Rejection Ratio OUTPUT Output Voltage Range Output Resistance DYNAMIC RESPONSE Small Signal -3dB Bandwidth Slew Rate NOISE 0.1Hz to 10Hz, RTI Spectral Density, 1kHz, , RTI OFFSET ADJUSTMENT Ratiometric Accuracy3 Accuracy, RTO Offset Adjustment Range V ref Divider resistor values POWER SUPPLY Operating Range Quiescent Current Over Temp Power Supply Rejection Ratio TEMPERATURE RANGE For Specified Performance Divider to supplies Voltage applied to Vref1 and Vref2 in parallel 0.497 25C Specified Temperature Range
400 200 Common-Mode, Continuous Differential1 f = 1kHz F = 10kHz2 -2 100 80 80 80 80 65 -2
400 200 65 100
k k V mV dB dB
0.05 2 50 0.5 20 0.5
4.8
0.05 2 50 0.5 20 0.5
4.8
V kHz V/S V, p-p V/Hz
0.503 0.497 1 4.8 34 5.5 1.5 0.05 30 4.7
0.503 V/V 1 mV 4.8 34 V k
0.05 30 4.5 VO = 0.1V DC 70
5.5 V 1.5 mA dB
70
-40
+125
-40
+150 C
1 2 3
Input voltage range = 50mV with half scale offset. Source Imbalance < 2
The offset adjustment is ratiometric to the power supply when Vref1, and Vref2 are used as a divider between the supplies.
REV. PrJ 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. 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 companies.
2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved.
Preliminary Technical Data
Absolute Maximum Ratings
Supply Voltage ........................ Continuous Input Voltage............ Transient Input Voltage ............. Reverse Supply Voltage ............ Operating Temperature ............. Storage Temperature ................ Output Short Circuit Duration ..... 12.5V 65V TBD 0.3V -40C to 125C -65C to 150C Indefinite
AD8205
REV. PrJ 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. 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 companies.
3
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved.

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