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Avago Introduces Optically Isolated Σ-Δ Modulators

November 26, 2008

Innovative modulator design uses an external clock to provide precise measurement of motor phase currents in power inverter applications.


NUREMBERG, Germany--(BUSINESS WIRE)--Avago Technologies, a leading supplier of analog interface components for communications, industrial and consumer applications, announced one of the industry's first optically isolated Σ-Δ modulators using an external clock to provide direct measurement of motor phase currents in power inverters. Based on an advanced low power CMOS process, the ACPL-796J uses an external clock that allows synchronized data conversion between the current sensor and controller to help motor control designers eliminate complex design processes in data and clock reading. Moreover, the ACPL-796J is designed with digital inputs and outputs that are compatible with systems powered by 5- or 3-volt supplies and works under a wide industrial temperature range.

Combined with superior optical coupling technology, the modulator delivers high noise margins and excellent immunity against isolation-mode transients. With 0.5 mm minimum distance through insulation, the ACPL-796J provides reliable double protection and high working insulation voltage, which is suitable for fail-safe designs. Offered in a 16-lead small outline package, the isolated A/D converter delivers the reliability, small size, superior isolation and over-temperature performance motor drive designers need to accurately measure current at a much lower price compared to traditional current transducers. The ACPL-796J is ideal for use in industrial applications such as HVAC systems, conveyors, servo motors and a wide range of industrial automation applications.

Key Features
 

  • 5–20 MHz external clock input range
  • 1-bit, second order Σ-Δ modulator
  • 16-bit resolution (12-bit effective resolution)
  • 74 dB minimum SNR
  • 3.5 µV/°C maximum offset drift
  • ±1% maximum gain error
  • ±200 mV linear range with single 5V supply (±320 mV F.S.)
  • 3 to 5.5V wide supply range for digital I/O
  • 25 kV/µs Common-Mode transient immunity
  • Operating temperature range: –40° to 105°C
  • Worldwide industrial safety approvals: IEC/EN/DIN EN 60747-5-2, UL 1577 and CSA

Pricing and Availability
Avago's ACPL-796J is priced at $6.00 in 10,000 quantities. Samples and production quantities are available now through Avago's direct sales channel and worldwide distribution partners.

About Avago Technologies
Avago Technologies is a leading supplier of analog 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 the Web at www.avagotech.com.


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