TI isolated amplifier extends working voltage range

Texas Instruments has introduced a reinforced isolated amplifier intended for applications that need long lifetimes through a design that increases working voltage 50 per cent above the level required by industry standards.

The ISO224 amplifier is designed for isolated voltage sensing in factory automation and control, grid infrastructure, rail transport and motor drive applications. For the ISO224, TI has employed capacitive isolation technology to enable long lifetimes. The isolation offers common-mode transient immunity (CMTI) of up to 80kV per micro second and robust operation over an extended industrial temperature range of -55 degrees C to +125 degree C.

The high-precision design of the ISO224 enables more accurate measurements of ±10V signals by providing 25 per cent better nonlinearity, eight times lower gain error, lower offset drift and faster system response than similar competitive devices, says TI.

Using the ISO224, engineers can reduce board space owing to a design that is 60 per cent smaller than the previous-generation ISO12x amplifiers. A further improvement is the provision of an output that supports direct connection to an analogue-to-digital converter with 5V input. The ISO224 also features a single, high-side supply with integrated voltage detection that simplifies design and system-level diagnostics.

To start work on a project incorporating the ISO224, designers can download the TINA-TI SPICE model or reference design, then simulate and analyse circuit behaviour. Alternatively, they can prototype using the ISO224 evaluation module.

Preproduction samples of the ISO224 are available now through the TI store. The ISO224 is available in an 8-pin, 5.85mm x 7.5mm small-outline integrated circuit package. Pricing starts at $6.49.

The ISO224 joins TI’s portfolio of low-power reinforced isolated amplifiers, which are intended to allow engineers to extend the lifespan of their high-voltage systems.

The products are supported by a range of certifications such as VDE, CSA and UL.


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