High Common-Mode Voltage, Single Supply
Difference Amplifier
a
AD8200
FEATURES
FUNCTIONAL BLOCK DIAGRAM
High Common-Mode Voltage Range –2 V to +24 V at a
5 V Supply Voltage
Operating Temperature Range
Die: –40ꢀC to +150ꢀC
SOIC (R) Package
DIE Form
NC
A1
A2
+V
S
8-Lead SOIC: –40ꢀC to +125ꢀC
Supply Voltage Range: 4.7 V to 12 V
Low-Pass Filter (One Pole or Two Pole)
AD8200
100kꢂ
G = X10
+IN
A1
–IN
G = X2
+IN
A2
–IN
EXCELLENT AC AND DC PERFORMANCE
15 ꢁV/ꢀC Max Offset Drift
20 ppm/ꢀC Max Gain Drift
+IN
OUT
–IN
80 dB CMRR Min DC to 10 kHz
10kꢂ
200kꢂ
200kꢂ
PLATFORMS
10kꢂ
Transmission Control
Diesel Injection Control
Engine Management
Semi-Active Suspension Control
Vehicle Dynamics Control
NC = NO CONNECT
GND
GENERAL DESCRIPTION
Automotive platforms demand precision components for better
system control. The AD8200 provides excellent ac and dc per-
formance that keeps errors to a minimum in the user’s system.
Typical offset and gain drift in the SOIC package are 6 µV/°C
and 10 ppm/°C, respectively. The device also delivers a mini-
mum CMRR of 80 dB from dc to 10 kHz.
The AD8200 is a single-supply difference amplifier for amplifying
and low-pass filtering small differential voltages in the presence
of a large common-mode voltage. The input CMV range extends
from –2 V to +24 V at a typical supply voltage of 5 V.
The AD8200 is offered in die and packaged form. Both package
options are specified over wide temperature ranges, making the
AD8200 well suited for use in many automotive platforms. The
SOIC package is specified over a temperature range of –40°C to
+125°C. The die is specified from –40°C to +150°C.
The AD8200 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 20.
POWER
DEVICE
INDUCTIVE
LOAD
5V
5V
CLAMP
DIODE
OUTPUT
OUTPUT
BATTERY
14V
+IN NC +V OUT
S
+IN NC +V OUT
S
BATTERY
14V
4 TERM
SHUNT
4 TERM
SHUNT
AD8200
AD8200
–IN GND A1 A2
–IN GND A1 A2
POWER
DEVICE
CLAMP
DIODE
INDUCTIVE
LOAD
COMMON
NC = NO CONNECT
COMMON
NC = NO CONNECT
Figure 1. High-Line Current Sensor
Figure 2. Low-Line Current Sensor
REV. 0
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use, nor for any infringements of patents or other rights of third parties
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© Analog Devices, Inc., 2000