In addition to eliminating signal transformer and drastically cutting parts count, the DAA chip provides high isolation and very low Tx harmonic distortion to comply with safety and EMI standards. At 4.2-kV isolation and -60-dB Tx harmonic distortion, the HCPL-800J chip is crafted to comply with international safety standards such as UL, CSA and VDE, as well as EMI specifications such as CENELEC EN-50065-1, FCC part 15 Class B. However, approval under the following safety standards is currently pending: VDE0884/06.92 (IEC/EN/DIN EN60747-5-2) with VIORM = 891-V peak; UL 1577, component recognition program, File E55361; and CSA Acceptance Notice #5, File CA 88324.

"Excellent transmitter performance is achieved with the use of a high-efficiency, low-distortion line driver stage on-chip," said Simon Lam, product manager for Agilent's Isolation Products Division based in Singapore. He added that transmitter robustness is further enhanced with integrated load detection and overtemperature protection functions. The HCPL-800J is designed to work with various transceiver ICs and significantly simplifies the implementation of a powerline modem.

The AFE chip offers 1-A (p-p) output drive current capability. Typical input referred noise spec is rated at 25-nV/√Hz. Other features include overtemperature shutdown, line status monitoring (load detection and low supply voltage detection), undervoltage detection, and a wide operating temperature range.

The HCPL-800J incorporates two integrated circuits: a control IC and a line IC, optically isolated from each other. The modulated signal from the PLM transceiver is input to the control IC. This transmit signal is optically coupled to the line IC, then amplified and sent to the powerline. In the other direction, a potentially weak and noisy signal from the powerline is received by the line IC and optically coupled to the control IC, where it is amplified and output to the PLM transceiver. However, to complete the AFE solution, it requires a simple LC coupling circuit and filters. Narrowband powerline communication systems typically operate at up to 9.6 kb/s and use PLMs that plug in to the ac power outlet to deliver control and automation functions.

Designed for powerline modems operating at frequencies up to 450 kHz, the HCPL-800J requires two 5-V power supplies and comes in a 16-pin SOIC package. It is priced at less than $2.80 each in high-volume quantities. It is slated to go into full production in the first quarter of 2004. An evaluation board also is available. In addition, the company is developing a reference design scheduled for release in the first quarter next year. Other variations are in the works to address custom, as well as price-sensitive applications. Moreover, Agilent is planning to extend its capability to broadband powerline modems.

For more information, visit www.agilent.com/view/optocouplers.

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