Isolation amplifier from Avago offers greater accuracy



Avago Technologies has introduced a new precision optical isolation amplifier for motor control and current sensing applications. The ACPL-790B, ACPL-790A and ACPL-7900 devices improve the accuracy and response times of the Avago isolation amplifier portfolio, while addressing compact applications with a smaller footprint package design for solar module power systems and general analog isolation.


Competing solutions based on Hall Effect technology and current transformer technology suffer electrical parameter variation over temperature fluctuations and require a larger footprint in a design.


As current flows through the external resistor in a motor drive implementation, the resulting analog voltage drop is sensed by an ACPL-790B/790A/7900 isolation amplifier, and it allows a proportional output voltage to safely be created on the other side of the optical isolation barrier. The ACPL-790B precise isolation amplifier provides up to 0.5% high gain accuracy, and offer 200 kHz bandwidth and 1.6 μs fast response time to enable capture of transient signals in short circuit and overload conditions. The devices operate from a single 5V supply that is compatible with 3.3V outputs and provides improved linearity and dynamic performance of 60 dB SNR. With 200 kHz bandwidth, 1.6 µs fast response time, the product captures transients in short circuit and overload conditions.


Solar module power systems.


For general applications, the ACPL-790A (±1% gain tolerance) and the ACPL-7900 (±3% gain tolerance) are recommended. For high precision applications, the ACPL-790B (±0.5% gain tolerance) can be used. Compliant to UL 1577 5000 Vrms/1 minute rating, IEC/EN/DIN EN 60747-5-5 and CSA industrial safety standards.


Samples and production quantities are available now.

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