−2V to 50V Wide Input Voltage Range, 1.8MHz High Bandwidth, Current-Sense Amplifier with PWM Rejection and Gain 10V/V

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 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.

APPLICATIONS

* In-phase or High-side current sensing in

* Motor control in BLDC motors, Low-inductance motors

* Bidirectional 48 V to 12 V DC-DC converters

* Solenoid controls

* Power rail monitoring

* Low-side current sensing

* 1.8MHz small signal, −3 dB 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

* −2 V to +50 V, continuous operation

* −20 V to +85 V, continuous survival