Analog DevicesAD8412ABRMZAmplificateurs SP

The AD8412A is a high-voltage, high-bandwidth current sense 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.

In the AD8412A, 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.

Key Features and Benefits

• •  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
• •  Initial gain: 10 V/V
• •  Wide operating temperature range: −40°C to +125°C
• •  2.9V to 5.5V power-supply operating range
• •  Available in 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

Evaluation Board

The AD8412A can be evaluated with the EVAL-AD8412A.

Block Diagrams and Tables