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 sense
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 buffered
EMI filters included
output voltage directly interfaces with any typical converter.
High common-mode input voltage range
The AD8417 offers excel ent input common-mode rejection
−2 V to +70 V continuous
from −2 V to +70 V. The AD8417 performs bidirectional current
−3 V to +80 V survival
measurements across a shunt resistor in a variety of automotive
Initial gain = 60 V/V
and industrial applications, including motor control, power
Wide operating temperature range
management, and solenoid control.
AD8417WB (8-lead MSOP, 8-lead SOIC_N, and 10-lead
The AD8417 offers breakthrough performance throughout the
MSOP) and AD8417B (8-lead MSOP): −40°C to +125°C
−40°C to +150°C temperature range (AD8417WH). It features
AD8417WH (8-lead SOIC_N and 8-lead MSOP):
a zero drift core, which leads to a typical offset drift of 0.1 µV/°C
−40°C to +150°C
throughout the operating temperature range and the common-
Bidirectional operation
mode voltage range. The AD8417 is qualified for automotive
Available in 8-lead SOIC_N, 8-lead MSOP, and FMEA tolerant
applications. The device includes electromagnetic interference
10-lead MSOP pinout
(EMI) filters and patented (U.S. Patent 8,624,668 B2) circuitry
CMRR: 86 dB, dc to 10 kHz
to enable output accuracy with pulse-width modulation (PWM)
AEC-Q100 qualified for automotive applications
type input common-mode voltages. The typical input offset voltage
APPLICATIONS
is ±200 µV. The AD8417 is offered in 8-lead MSOP and 8-lead
High-side current sensing in
SOIC_N, along with a 10-lead MSOP pinout option engineered
Motor controls
for failure mode and effects analysis (FMEA).
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
TYPICAL APPLICATION CIRCUIT 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 –50A
001 1882- 1 Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS 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 PINOUT OPTION ENGINEERED FOR FMEA OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS