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Avago Technologies has brought out three miniature precision isolation amplifiers for industrial motor control and renewable-energy markets.

They feature increased accuracy, bandwidth and high insulation, made possible thanks to Avago’s optical-isolation technology.

Based on sigma-delta analogue-to-digital converters and chopper-stabilised amplifiers, the new isolation amplifiers feature high gain accuracy, low-temperature drift, 3.3V/5V output supply operation and a wide -40C to +105C operating-temperature range.

These features are delivered in a stretched SO-8 package that has a footprint 30 per cent smaller than the standard DIP-8 package.

When mounted on a PCB, it occupies a space that is a fraction of a traditional Hall Effect or transformer-based isolation amplifier.

The series is implemented with a fully differential circuit topology with a gain accuracy of +/-0.5 per cent (ACPL-C79B), +/- one per cent (ACPL-C79A), or +/- three per cent (ACPL-C790).

Normalised gain drift is -50ppm/C.

With a 200kHz bandwidth and 1.6US response time, the ACPL-C79x captures transients during short circuit and overload conditions.

Operating from a single 5V supply, the isolation amplifier series features an excellent nonlinearity of 0.05 per cent and an SNR of 60dB.

The ACPL-C79x high common-mode transient immunity of 15kV/us provides the precision and stability needed to accurately monitor current in noisy motor-control environments.

This ensures smoother control with less ‘torque ripple’ in many motor-control applications.

Pending safety and regulatory approvals include: IEC/EN/DIN EN 60747-5-5: 1140V peak working insulation voltage; UL 1577: 5000Vrms / one-minute double-protection rating; and CSA: Component Acceptance Notice #5.

Widely used for motor phase and rail-current sensing, servo motor drive, switching power-supply feedback isolation, DC link voltage monitoring, inverter current sensing and switching power-supply feedback isolation, the ACPL-C97x targets industrial automation and instrumentation, renewable energy and HVAC markets.

In a typical motor-drive application, currents through a small-value current-sense resistor cause a voltage drop that is sensed by the ACPL-C79x isolation amplifier, and a differential output voltage, proportional to the current, is created on the output side of the isolation barrier.

Avago Technologies

Avago Technologies is a leading supplier of analogue interface components for communications, industrial and consumer applications. By leveraging its core competencies in III-V compound and silicon semiconductor design and processing, the company provides an extensive range of analog, mixed signal and optoelectronics components and subsystems to approximately 40,000 end customers.

Backed by strong customer service support, the company's products serve four diverse end markets: industrial and automotive electronics, wired infrastructure, wireless communications, and consumer and computer peripherals. Avago has a global employee presence and heritage of technical innovation dating back 40 years to its Hewlett-Packard roots. Information about Avago is available on its website.

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