Zero-Drift, High Voltage,
Bidirectional Difference Amplifier
AD8207
Rev. 0
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FEATURES
Ideal for current shunt applications
EMI filters included
1 μV/°C maximum input offset drift
High common-mode voltage range
−4 V to +65 V operating (5 V supply)
−4 V to +35 V operating (3.3 V supply)
−25 V to +75 V survival
Gain = 20 V/V
3.3 V to 5.5 V supply range
Wide operating temperature range: −40°C to +125°C
Bidirectional current monitoring
<500 nV/°C typical offset drift
<10 ppm/°C typical gain drift
>90 dB CMRR dc to 10 kHz
Qualified for automotive applications
APPLICATIONS
High-side current sensing in
Motor control
Solenoid control
Engine management
Electric power steering
Suspension control
Vehicle dynamic control
DC-to-DC converters
FUNCTIONAL BLOCK DIAGRAM
REF
+IN
–IN
OUT
V+
GND
V
REF
1
V
REF
2
RANGE
AD8207
ZERO
DRIFT
09160-001
Figure 1.
GENERAL DESCRIPTION
The AD8207 is a single-supply difference amplifier ideal for
amplifying small differential voltages in the presence of large
common-mode voltage. The operating input common-mode
voltage range extends from −4 V to +65 V with a 5 V supply.
The AD8207 works with a single-supply voltage of 3.3 V to 5 V,
and is ideally suited to withstand large input PWM common-
mode voltages, typical in solenoid and motor control applications.
The AD8207 is available in an 8-lead SOIC package. Excellent
dc performance over temperature keeps errors in the mea-
surement loop to a minimum. Offset drift is typically less
than 500 nV/°C, and gain drift is typically below 10 ppm/°C.
The AD8207 is ideal for bidirectional current sensing
applications. It features two reference pins,V
REF
1 and V
REF
2,
that allow the user to easily offset the output of the device to
any voltage within the supply range. With V
REF
1 attached to the
V+ pin and V
REF
2 attached to the GND pin, the output is set at
half scale. Attaching both pins to GND causes the output to
be unipolar, starting near ground. Attaching both pins to V+
ca
uses the output to be unipolar starting near V+. Other output
offsets are achieved by applying an external low impedance
voltage to the V
REF
1 and V
REF
2 pins.
