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AD8203 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD8203
Description  High Common-Mode Voltage, Single-Supply Difference Amplifier
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD8203 Datasheet(HTML) 1 Page - Analog Devices

 
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High Common-Mode Voltage,
Single-Supply Difference Amplifier
AD8203
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
High common-mode voltage range
−6 V to +30 V at a 5 V supply voltage
Operating temperature range: −40°C to +125°C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (1-pole or 2-pole)
Excellent ac and dc performance
±1 mV voltage offset (8-lead SOIC)
±1 ppm/°C typical gain drift
80 dB CMRR minimum dc to 10 kHz
APPLICATIONS
Transmission control
Diesel injection control
Engine management
Adaptive suspension control
Vehicle dynamics control
GENERAL DESCRIPTION
The AD8203 is a single-supply difference amplifier for amplify-
ing and low-pass filtering small differential voltages in the
presence of a large common-mode voltage (CMV). The input
CMV range extends from −6 V to +30 V at a typical supply
voltage of 5 V.
The AD8203 is available in die and packaged form. The MSOP
and SOIC packages are specified over a wide temperature range,
from −40°C to +125°C, while the die is specified over a wider
temperature range, from −40°C to +150°C, making the AD8203
well-suited for use in many automotive platforms.
Automotive platforms demand precision components for better
system control. The AD8203 provides excellent ac and dc
performance keeping errors to a minimum in the user’s system.
Typical offset and gain drift in the SOIC package are 0.3 μV/°C and
1 ppm/°C, respectively. Typical offset and gain drift in the MSOP
package are 2 μV/°C and 1 ppm/°C, respectively. The device also
delivers a minimum CMRR of 80 dB from dc to 10 kHz.
The AD8203 features an externally accessible 100 kΩ resistor at
the output of the Preamp A1, which can be used for low-pass
filter applications and for establishing gains other than 14.
FUNCTIONAL BLOCK DIAGRAMS
A1
+IN
–IN
200k
Ω
200k
Ω
100k
Ω
A2
+IN
–IN
G =
×7
G =
×2
AD8203
10k
Ω
10k
Ω
+IN
–IN
GND
OUT
NC
A1
A2
+VS
NC = NO CONNECT
2
5
7
4
6
8
1
3
Figure 1. Functional Block Diagram
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8203
5V
OUTPUT
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8203
5V
OUTPUT
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
COMMON
NC = NO CONNECT
Figure 3. Low Line Current Sensor


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