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CML limiting post amps offer twice the signal gain

Posted: 21 Dec 2007     Print Version  Bookmark and Share

Keywords:amplifiers  Micrel SY88343HL SY88289HL 

Micrel Inc. has beefed up its lineup of post amplifiers with the addition of two devices. The SY88343HL and SY88289HL devices are high-sensitivity, low-power CML limiting post amplifiers with twice the signal gain of the previously announced SY88343DL and SY88289CL.

The SY88343HL and SY88289HL post amplifiers are aimed at applications using low-cost trans-impedance amplifiers and/or low gain PIN diodes typically found in a variety of data and telecommunications markets including PON, Gigabit Ethernet, SFP/SFF optical transceivers, 1X and 2X Fiber Channel, and SONET/SDH: OC3/12/24/48 - STM 1/4/8/16 data rates.

How they work: In a fiber-optic module, the devices connect to typical transimpedance amplifiers (TIAs). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88289HL and SY88343HL quantise these signals and output them in low noise CML-level waveforms.

The SY88343HL and SY88289HL post amplifiers deliver a wide bandwidth, high gain, and are optimised to operate over a wide range of data rates from 155Mbit/s to 3.2Gbit/s. Both post amplifiers have chatter-free open collector TTL LOS outputs with adjustable loss-of-signal level set pin (LOS LVL) threshold. Each device operates from a single 3.3V power supply over temperatures ranging from -40°C to +85°C. The devices are packaged in 3-by-3mm 16-pin MLF package.

The SY88343HL and SY88289HL both feature high input sensitivity and can amplify input signals as small as 4mVpp to drive CML/PECL devices. The SY88343HL offers the same footprint as all other Micrel post amplifiers, which allow for flexible upgrades and interchangeability.

These devices also feature high-sensitivity loss-of-signal circuits that are suitable for detecting very small input signals. The post amplifiers are intended for applications where the receiver optical subassemblies (ROSAs) with low-cost/low-gain trans-impedance amplifiers and/or a PIN Photodiodes are used.

Price starts at Rs.98.26 ($2.49) in quantities of 1,000. Both devices are currently in volume production.

- Gina Roos

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