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Post amps tout LOS or SD for copper, fiber modules

Posted: 14 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:post amplifier? loss-of-signal? signal detect circuits? copper module applications? fiber-optic module designs?

Four low-power post amplifiers featuring loss-of-signal (LOS) or signal detect (SD) circuits, which are optimized to detect a wide input signal range, have been added to Micrel Inc.'s family of post amplifiers.

The SY88303BL, SY88305BL, SY88307BL and SY88309BL are well-suited for copper module applications and fiber-optic module designs that use high gain receiver optical sub-assemblies. They typically use an avalanche photodiode or high gain transimpedance amplifier. The solutions are targeted at a variety of data and telecommunications markets including passive optical network, Gigabit Ethernet, 1x and 2x Fiber Channel, and SONET/SDH: OC3/12/24/48-STM 1/4/8/16 data rates.

The SY88303BL and SY88307BL both feature a LOS circuit that is optimized to detect a larger and wider input signal range. Both optimized LOS/SD circuits are designed for applications where avalanche photodiodes and/or high-gain transimpedance amplifiers are used where a significant amount of noise can be added to the signal. Also, these post amplifier solutions can be used in copper module and backplane applications where the signal levels are normally much higher.

The SY88303BL and SY88305BL have current-mode logic-level outputs whereas the SY88307BL and SY88309BL have higher swing PECL-level outputs. The devices are also well-suited for operation in multi-rate applications from 155Mbit/s to 3.2Gbit/s. The detectable input range extends from 20mVpp to 140mVpp, which is wider than the range offered by devices currently available on the market, said Micrel. The devices also feature adjustable LOS threshold, internal 50? termination, and high gain through their data paths.

The SY88305BL and SY88309BL are identical to the SY88303BL and SY88307BL devices except they include a signal detect (SD) circuit instead of a LOS circuit. The different data output and input detection circuit options offer system designers greater flexibility.

These products are suited for multi-rate applications where the same post amplifier is optimized to operate over a wide range of data rates and signal amplitudes. They do not require external compensation and can operate from 155Mbit/s to 3.2Gbit/s with signal amplitudes ranging from 10mVpp to 1800mVpp. All these devices are offered in an ultra-small 16pin MLF package. The ICs also come in a 10pin EPAD-MSOP package option.

All devices are currently in volume production. Pricing starts at $2.49 in quantities of 1,000.

- Gina Roos

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