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AD8203 Datasheet

  • AD8203

  • High Common-Mode Voltage,Single-Supply Difference Amplifier

  • 717.68KB

  • 21页

  • AD

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High Common-Mode Voltage,
Single-Supply Difference Amplifier
AD8203
FEATURES
High common-mode voltage range
鈭? V to +30 V at a 5 V supply voltage
Operating temperature range: 鈭?0掳C to +125掳C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (1-pole or 2-pole)
Excellent ac and dc performance
卤1 mV voltage offset (8-lead SOIC)
卤1 ppm/掳C typical gain drift
80 dB CMRR minimum dc to 10 kHz
FUNCTIONAL BLOCK DIAGRAMS
NC
6
A1
3
A2
4
+V
S
7
AD8203
100k惟
G =
脳7
+IN
8
鈥揑N
1
200k惟
+IN
A1
鈥揑N
200k惟
10k惟
05013-001
G =
脳2
+IN
A2
鈥揑N
10k惟
5
OUT
APPLICATIONS
Transmission control
Diesel injection control
Engine management
Adaptive suspension control
Vehicle dynamics control
NC = NO CONNECT
2
GND
Figure 1. Functional Block Diagram
CLAMP
DIODE
INDUCTIVE
5V
LOAD
OUTPUT
+IN
+V
S
NC
OUT
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 鈭? 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 鈭?0掳C to +125掳C, while the die is specified over a wider
temperature range, from 鈭?0掳C to +150掳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鈥檚 system.
Typical offset and gain drift in the SOIC package are 0.3 渭V/掳C and
1 ppm/掳C, respectively. Typical offset and gain drift in the MSOP
package are 2 渭V/掳C and 1 ppm/掳C, respectively. The device also
delivers a minimum CMRR of 80 dB from dc to 10 kHz.
The AD8203 features an externally accessible 100 k惟 resistor at
the output of the Preamp A1, which can be used for low-pass
filter applications and for establishing gains other than 14.
BATTERY
14V
4-TERM
SHUNT
AD8203
鈥揑N
GND
A1
A2
POWER
DEVICE
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
POWER
DEVICE
5V
OUTPUT
+IN
+V
S
NC
OUT
BATTERY
14V
4-TERM
SHUNT
AD8203
鈥揑N
GND
A1
A2
CLAMP
DIODE
INDUCTIVE
LOAD
05013-003
COMMON
NC = NO CONNECT
Figure 3. Low Line Current Sensor
Rev. B
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: 781.461.3113
漏 2005 Analog Devices, Inc. All rights reserved.
05013-002

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