AD8203_15 Datasheet, PDF (1/20 Pages) Analog Devices – High Common-Mode Voltage, Single-Supply Difference Amplifier

Data Sheet
High Common-Mode Voltage,
Single-Supply Difference Amplifier
AD8203
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 packaged form. The MSOP and
SOIC packages are specified over a wide temperature range,
from −40°C to +125°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
+IN 8
–IN 1
200kΩ
NC
A1 A2
6
3
4
100kΩ
G = ×7
+IN
A1
–IN
200kΩ
+V_S
7
AD8203
G = ×2
+IN
A2
–IN
10kΩ
5 OUT
10kΩ
NC = NO CONNECT
2
GND
Figure 1. Functional Block Diagram
BATTERY
CLAMP
DIODE
14V
4-TERM
SHUNT
INDUCTIVE
LOAD
5V
+IN +V_S NC OUT
AD8203
OUTPUT
POWER
DEVICE
–IN GND A1 A2
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
BATTERY 14V
POWER
DEVICE 5V
+IN +V_S NC OUT
OUTPUT
4-TERM
SHUNT
AD8203
–IN GND A1 A2
CLAMP
DIODE
INDUCTIVE
LOAD
COMMON
NC = NO CONNECT
Figure 3. Low Line Current Sensor
Rev. D
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