FEATURES
 1.8MHz small signal, −3dB bandwidth
 In-package Trim Core (DigiTrim™)
 Precision without chopping and/or autozero
 Typical ±0.30μV/°C offset drift
 Maximum ±200μV voltage-offset over
temperature range
 Typical DC CMRR: 131dB
 Typical AC CMRR at 50kHz: 97dB
 Wide common-mode input voltage range
 −2V to +50V, continuous operation
 −20V to +85V, continuous survival
 Initial gain: 10V/V
 Wide operating temperature range: −40°C to +125°C
 Bidirectional operation
 2.9V to 5.5V power-supply operating range
 Available in an 8-lead MSOP package
APPLICATIONS
 In-phase or high-side current sensing in:
 Motor control in BLDC motors, low-inductance
motors
 Bidirectional 48V to 12V DC to DC converters
 Solenoid controls
 Power rail monitoring
 Low-side current sensing
GENERAL DESCRIPTION
The AD8412A is a high voltage, high bandwidth currentsense
amplifier. The device features an initial gain of
10V/V, with a 1.8MHz bandwidth with a maximum
±0.11% gain error over the entire temperature range.
The buffered output voltage directly interfaces with any
typical converter. The AD8412A has a minimum DC
common-mode rejection ratio (CMRR) of 110dB from
−2V to +50V. The AD8412A performs bidirectional
current measurements across a shunt resistor in a
variety of industrial and automotive applications.
The AD8412A 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 ±0.30μV/°C (based on box
method, as in Figure 56) throughout the operating
temperature range and the common-mode voltage
range without the need for chopping and autozero
clocks (which can lead to intermodulation in the
application). The device includes 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
ultralow CMRR drift. The device also includes circuitry to
enable output accuracy in the presence of pulse-width
modulation (PWM) type input common-mode voltages.
The AD8412A is available in an 8-lead, MSOP package.