High Voltage,
Precision Difference Amplifier
Data Sheet
Rev. A Document Feedback
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FEATURES
±8000 V HBM ESD for shunt-based applications
AEC-Q100 qualified
EMI filters included
High common-mode voltage range
−2 V to +50 V operating
−20 V to +70 V survival
Buffered output voltage
Gain = 14 V/V
Low-pass filter (single-pole or two-pole)
Wide operating temperature range: −40°C to +125°C
Excellent ac and dc performance
±1 mV typical voltage offset
−5 ppm/°C typical gain drift
80 dB CMRR minimum dc to 10 kHz
Qualified for automotive applications
APPLICATIONS
High-side current sensing
Motor controls
Solenoid controls
Power management
Low-side current sensing
Diagnostic protection
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GENERAL DESCRIPTION
The AD8209A is a single-supply difference amplifier ideal for
amplifying and low-pass filtering small differential voltages in the
presence of a large common-mode voltage. The input common-
mode voltage range extends from −2 V to +50 V at a single 5 V
supply. The AD8209A is qualified per AEC-Q100 specifications.
The amplifier offers enhanced input overvoltage and ESD
protection, and includes electromagnetic interference (EMI)
filtering.
Automotive applications demand robust, precision components for
improved system control. The AD8209A provides excellent ac and
dc performance, minimizing errors in the application. Typical
offset and gain drift in the MSOP package are less than 5 µV/°C
and −5 ppm/°C, respectively. The device also delivers a minimum
common-mode rejection ratio (CMRR) of 80 dB from dc to
10 kHz.
The AD8209A features an externally accessible 100 kΩ resistor
at the output of the preamplifier (A1) that can be used for low-
pass filtering and for establishing gains other than 14 V/V.
OUT
+IN
–IN
GND
V
S
+
–
AD8209A
G = 2G = 7
A1 A2
+
–
14511-001
EMI
FILTER
EMI
FILTER
EMI
FILTER
