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.