AD8412A: −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 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
Featured Parts
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