High Common-Mode Voltage,
Single-Supply Difference Amplifier
AD8203
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
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 ppmꢀ°C typical gain drift
NC
6
A1
3
A2
4
+V
S
7
AD8203
100kΩ
G = ×7
+IN
A1
–IN
G = ×2
+IN
A2
–IN
8
1
+IN
–IN
5
OUT
10kΩ
200kΩ
200kΩ
10kΩ
80 dB CMRR minimum dc to 10 kHz
APPLICATIONS
2
NC = NO CONNECT
GND
Transmission control
Diesel injection control
Engine management
Figure 1. Functional Block Diagram
Adaptive suspension control
Vehicle dynamics control
INDUCTIVE
LOAD
5V
CLAMP
DIODE
OUTPUT
+IN +V
NC OUT
S
GENERAL DESCRIPTION
BATTERY
14V
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.
4-TERM
SHUNT
AD8203
–IN GND A1
A2
POWER
DEVICE
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.
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
POWER
DEVICE
5V
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 ꢀV/°C and 1 ppm/°C, respectively. The device also
delivers a minimum CMRR of 80 dB from dc to 10 kHz.
OUTPUT
+IN +V
NC OUT
S
BATTERY
14V
4-TERM
SHUNT
AD8203
–IN GND A1
A2
CLAMP
DIODE
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.
INDUCTIVE
LOAD
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
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