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Details, datasheet, quote on part number:AD8205
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| Part: | AD8205 |
| Category: | Analog & Mixed-Signal Processing => Amplifiers => Differential Amplifiers |
| Description: | Single Supply 42V System Difference Amplifier.<<<>>>the AD8205 is a High-performance, Single-supply Difference Amplifier With a Wide Input Common Mode Voltage (CMV) Operational Range of -2 V to 65 V, Which Allows The Chip to Measure Small Differential Voltages--such as Across a Shunt Resistor--in The Presence of High Voltages (large CMV). Additionally, The Device CAN Survive Over an Input CMV Range of -5 V to 70 V. <<<>>>Features <<<>>><<<>>>Wide Input Common Mode Voltage Range <<<>>>Operation: -2V to +65V <<<>>>Survival: -5V to +70V <<<>>>20µV/ C Offset Drift <<<>>>20ppm/ C Gain Drift <<<>>>80dB CMRR Min DC to 10kHz <<<>>>Operating Temperature Range: <<<>>>Die: -40 C to 150 C<<<>>>8 Pin SOIC: -40 C to 125 C<<<>>>adjustable Output Offset |
| Company: | Analog Devices |
| Datasheet: | Download AD8205 datasheet File size : 316 kB |
| Request For quote: | Find where to buy AD8205
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Datasheet text preview:
Single-Supply 42 V System Difference Amplifier AD8205
FEATURES
Ideal for current shunt applications High common-mode voltage range -2 V to +65 V operating -5 V to +68 V survival Gain = 50 Wide operating temperature range Die: -40°C to +150°C 8-lead SOIC: -40°C to +125°C Adjustable offset Available in SOIC and die form
FUNCTIONAL BLOCK DIAGRAM
V+
6
+IN 8
5
OUT
IN 1
AD8205
7
VREF1
3
NC 4
2
VREF2
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EXCELLENT AC AND DC PERFORMANCE
15 µV/°C offset drift 30 ppm/°C gain drift 80 dB CMRR dc to 20 kHz
NC = NO CONNECT
GND
Figure 1.
APPLICATIONS
High-side current sensing in: Motor controls Transmission controls Diesel injection controls Engine management Suspension controls Vehicle dynamic controls DC-to-dc converters
GENERAL DESCRIPTION
The AD8205 is a single-supply difference amplifier for amplifying small differential voltages in the presence of large commonmode voltages. The operating input common-mode voltage range extends from -2 V to +65 V. The typical single-supply voltage is 5 V. The AD8205 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than the packaged part to enable the user to apply the AD8205 in high temperature applications. Excellent dc performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically less than 15 µV/°C, and gain drift is typically below 30 ppm/°C. The output offset can be adjusted from 0.05 V to 4.8 V with a 5 V supply by using the VREF1 and VREF2 pins. With VREF1 attached to the V+ pin, and VREF2 attached to the GND pin, the output is set at half scale. Attaching both pins to GND causes the output to be unipolar, starting near ground. Attaching both pins to V+ causes the output to be unipolar starting near V+. Other offsets can be obtained by applying an external voltage to the VREF1 and VREF2 pins.
Rev. 0
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: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
AD8205 TABLE OF CONTENTS
Specifications.... 3 Absolute Maximum Ratings... 4 ESD Caution.......... 4 Pin Configuration and Function Descriptions..... 5 Typical Performance Characteristics ............ 6 Theory of Operation ...... 8 Output Offset Adjustment...... 9 Unidirectional Operation... 9 Ground Referenced Output ........ 9 V+ Referenced Output........ 9 Bidirectional Operation.......9 External Reference Output........ 10 Splitting the Supply ........... 10 Splitting an External Reference ...... 10 Applications.... 11 High-Side Current Sense with a Low-Side Switch........ 11 High-Side Current Sense with a High-Side Switch ...... 11 Outline Dimensions ..... 12 Ordering Guide ........ 12
REVISION HISTORY
4/04--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
AD8205 SPECIFICATIONS
TA = Operating Temperature Range, VS = 5 V, unless otherwise noted. Table 1.
Parameter GAIN Initial Accuracy Accuracy Over Temperature Gain vs. Temperature VOLTAGE OFFSET Offset Voltage (RTI) Over Temperature (RTI) Offset Drift INPUT Input Impedance Differential Common Mode Input Voltage Range Common-Mode Rejection Conditions AD8205 SOIC Min Typ Max 50 VO 0.1 V dc, 25°C Specified Temperature Range ±30 25°C Specified Temperature Range 15 ±2 ±4.5 15 ±1 ±1.2 ±30 ±2.5 ±6 Min AD8205 DIE Typ Max 50 ±1 ±1.3 Unit V/V % % ppm/°C mV mV µV/°C
400 200 Common Mode, Continuous Differential1 25°C, f = DC to 20 kHz2 Operating Temperature Range, f = DC to 20 kHz2 RL = 25 k -2 78 76 100 86 80 65 -2 78 76
400 200 65 100 86 80
k k V mV dB dB
OUTPUT Output Voltage Range Output Resistance DYNAMIC RESPONSE Small Signal -3 dB Bandwidth Slew Rate NOISE 0.1 Hz to 10 Hz, RTI Spectral Density, 1 kHz, RTI OFFSET ADJUSTMENT Ratiometric Accurancy3 Accuracty, RTO Output Offset Adjustment Range VREF Divider Resistor Values POWER SUPPLY Operating Range Quiescent Current Over Temperature Power Supply Rejection Ratio Temperature Range For Specified Performance
0.05 200 50 0.5 20 0.5
4.8
0.05 200 50 0.5 20 0.5
4.8
V kHz V/µs µV p-p µV/Hz
Divider to Supplies Voltage applied to VREF1 and VREF2 in Parallel VS = 5 V
0.497
0.503 ±2 4.8 40 5.5 2
0.497
0.503 ±2 4.8 40 5.5 2
V/V mV/V V k V mA dB °C
0.05 24 4.5
32
0.05 24 4.5 70
32
VO = 0.1 V dc 70 Operating Temperature Range -40
+125
-40°C
+150
1 2
Input voltage range = ±50 mV with half-scale offset. Source imbalance < 2 . 3 The offset adjustment is ratiometric to the power supply when VREF1 and VREF2 are used as a divider between the supplies.
Rev. 0 | Page 3 of 12
AD8205 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Supply Voltage Continuous Input Voltage Reverse Supply Voltage Operating Temperature Range Storage Temperature Output Short-Circuit Duration Rating 12.5 V -5 V to +68 V 0.3 V -40°C to +125°C -65 to +150C Indefinite
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 4 of 12
AD8205 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
IN 1 GND 2 VREF2 3
8
+IN
NC = NO CONNECT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7 8 Mnemonic -IN GND VREF2 NC OUT V+ VREF1 +IN X -206 -447 -432 N/A 444 444 456 203 Y 508 57 -457 N/A -472 -203 434 509
Figure 2. Metallization Diagram
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Die size is 1170 µm by 1280 µm. Die thickness is 13 mil. Minimum passivation opening (minimum bond pad size) is 92 µm × 92 µm. Passivation type is 8KA USG (Oxide) + 10KA Oxynitride. Bond pad metal composition is 98.5% Al, 1% Si, and 0.5% Cu. Backside potential is V+.
Rev. 0 | Page 5 of 12
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VREF1 TOP VIEW 6 V+ (Not to Scale) NC 4 5 OUT
7
AD8205
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