Datasheet AD8417 (Analog Devices)

Bidirectional, Zero Drift, Current Sense Amplifier Data Sheet AD8417 FEATURES GENERAL DESCRIPTION Typical 0.1 μV/°C offset drift
The AD8417 is a high voltage, high resolution current shunt
Maximum ±400 μV voltage offset over full temperature range
amplifier. It features an initial gain of 60 V/V, with a maximum
2.7 V to 5.5 V power supply operating range
±0.3% gain error over the entire temperature range. The
Electromagnetic interference (EMI) filters included
buffered output voltage directly interfaces with any typical
High common-mode input voltage range
converter. The AD8417 offers excellent input common-mode
−2 V to +70 V continuous
rejection from −2 V to +70 V. The AD8417 performs bidirectional
−4 V to +85 V survival
current measurements across a shunt resistor in a variety of
Initial gain = 60 V/V
automotive and industrial applications, including motor control,
Wide operating temperature range
power management, and solenoid control.
AD8417WB: −4 0°C to +125°C
The AD8417 offers breakthrough performance throughout the
AD8417WH: −4 0°C to +150°C
−40°C to +150°C temperature range. It features a zero drift core,
Bidirectional operation
which leads to a typical offset drift of 0.1 μV/°C throughout the
Available in 8-lead SOIC and 8-lead MSOP
operating temperature range and the common-mode voltage
Common-mode rejection ratio (CMRR): 86 dB, dc to 10 kHz
range. The AD8417 is qualified for automotive applications. The
Qualified for automotive applications
device includes EMI filters and patented circuitry to enable output accuracy with pulse-width modulation (PWM) type
APPLICATIONS
input common-mode voltages. The typical input offset voltage
High-side current sensing in
is ±200 μV. The AD8417 is offered in 8-lead MSOP and SOIC
Motor controls
packages.
Solenoid controls Table 1. Related Devices Power management Part No. Description Low-side current sensing
AD8205 Current sense amplifier, gain = 50
Diagnostic protection
AD8206 Current sense amplifier, gain = 20 AD8207 High accuracy current sense amplifier, gain = 20 AD8210 High speed current sense amplifier, gain = 20 AD8418 High accuracy current sense amplifier, gain = 20
FUNCTIONAL BLOCK DIAGRAM VCM = –2V TO +70V VS = 2.7V TO 5.5V 70V V V S REF1 VOUT V V S CM AD8417 +IN EMI + I FILTER SHUNT 0V OUT G = 60 RSHUNT VS/2 –IN EMI – 50A FILTER ISHUNT 0V GND VREF2
1
–50A
00 2- 188 1 Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OUTPUT OFFSET ADJUSTMENT UNIDIRECTIONAL OPERATION Ground Referenced Output Mode VS 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 High Rail Current Sensing OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS