Data Sheet
AD8411A
−2 V to 70 V Wide Input Voltage Range, 2.7 MHz High Bandwidth,
Current-Sense Amplifier with PWM Rejection and Gain 50 V/V
GENERAL DESCRIPTION
FEATURES
The AD8411A1 is a high-voltage, high-bandwidth current-sense
amplifier. The device features an initial gain of 50 V/V, with a 2.7
► 2.7 MHz small signal, −3 dB bandwidth
™
MHz bandwidth with a maximum ±0.15% gain error over the entire
temperature range. The buffered output voltage directly interfaces
with any typical converter. The AD8411A has a minimum DC com-
mon-mode rejection ratio (CMRR) of 123 dB from −2 V to +70 V.
The AD8411A performs bidirectional current measurements across
a shunt resistor in various industrial and automotive applications.
► In-package Trim Core (DigiTrim
)
► Precision without chopping and/or auto-zero
► Typical ±0.26 µV/°C offset drift
► Maximum ±200 µV voltage-offset over temperature range
► Typical DC CMRR: 142 dB
► Typical AC CMRR at 50 kHz: 96 dB
► Wide common-mode input voltage range
► −2 V to +70 V, continuous operation
► −20 V to +85 V, continuous survival
► Initial gain: 50 V/V
► Wide operating temperature range: −40°C to +125°C
► Bidirectional operation
► 2.9 V to 5.5 V power-supply operating range
The AD8411A offers breakthrough performance throughout the
−40°C to +125°C temperature range. The device features an
in-package trim core, which leads to a typical offset drift of
±0.26 µV/°C (based on Box Method, see Figure 56) throughout
the operating temperature range and the common-mode voltage
range without the need for chopping and auto-zero clocks (which
could lead to intermodulation in the application). The device in-
cludes circuitry to achieve a wide input common-mode range and
balanced input bias currents, regardless of input differential voltage
or common-mode voltage, and circuitry to achieve ultra-low CMRR
drift. The device also includes circuitry to enable output accuracy
in the presence of pulse-width modulation (PWM) type input com-
mon-mode voltages. The AD8411A is available in 8-lead, SOIC_N
package and 8-lead, MSOP package.
► Available in 8-lead, SOIC_N package and 8-lead, MSOP pack-
age.
► AEC-Q100 qualified for automotive applications
APPLICATIONS
► In-phase or High-side current sensing in
► BLDC motors, Low-inductance motors
► Bidirectional 48 V to 12 V DC-DC converters
► Solenoid controls
► Power rail monitoring
► Low-side current sensing
TYPICAL APPLICATION CIRCUIT
Figure 2. Input Common-Mode Step Response (0 V to 60 V), VS = 5 V, Inputs
Shorted
Figure 1. AD8411A in BLDC Motor Control Application
1
Protected by U.S. patent numbers 10,312,865 and 10,587,228.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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