Datasheet AD8207 (Analog Devices)

Zero-Drift, High Voltage, Bidirectional Difference Amplifier AD8207 FEATURES FUNCTIONAL BLOCK DIAGRAM V+ Ideal for current shunt applications EMI filters included +IN 1 μV/°C maximum input offset drift ZERO OUT DRIFT High common-mode voltage range –IN −4 V to +65 V operating (5 V supply) AD8207 −4 V to +35 V operating (3.3 V supply) −25 V to +75 V survival VREF1 Gain = 20 V/V RANGE REF 3.3 V to 5.5 V supply range Wide operating temperature range: −40°C to +125°C VREF2 Bidirectional current monitoring
1 00
<500 nV/°C typical offset drift
0-
GND
16 09
<10 ppm/°C typical gain drift
Figure 1.
>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 GENERAL DESCRIPTION
The AD8207 is a single-supply difference amplifier ideal for The AD8207 is ideal for bidirectional current sensing amplifying small differential voltages in the presence of large applications. It features two reference pins,VREF1 and VREF2, common-mode voltage. The operating input common-mode that allow the user to easily offset the output of the device to voltage range extends from −4 V to +65 V with a 5 V supply. any voltage within the supply range. With VREF1 attached to the The AD8207 works with a single-supply voltage of 3.3 V to 5 V, V+ pin and VREF2 attached to the GND pin, the output is set at and is ideally suited to withstand large input PWM common- half scale. Attaching both pins to GND causes the output to mode voltages, typical in solenoid and motor control applications. be unipolar, starting near ground. Attaching both pins to V+ The AD8207 is available in an 8-lead SOIC package. Excellent causes the output to be unipolar starting near V+. Other output dc performance over temperature keeps errors in the mea- offsets are achieved by applying an external low impedance surement loop to a minimum. Offset drift is typically less voltage to the VREF1 and VREF2 pins. than 500 nV/°C, and gain drift is typically below 10 ppm/°C.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION POWER SUPPLY ADJUSTMENT 3.3 V TO 4.5 V SUPPLY OPERATION 4.5 V TO 5.5 V SUPPLY OPERATION OUTPUT OFFSET ADJUSTMENT UNIDIRECTIONAL OPERATION Ground Referenced Output Mode V+ Referenced Output Mode BIDIRECTIONAL OPERATION EXTERNAL REFERENCED OUTPUT SPLITTING THE SUPPLY SPLITTING AN EXTERNAL REFERENCE APPLICATIONS INFORMATION MOTOR CONTROL 3-Phase Motor Control H-Bridge Motor Control SOLENOID CONTROL High-Side Current Sense with a Low-Side Switch High-Side Current Sense with a High-Side Switch OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS