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.