Post Amplifiers drive devices with CML and PECL inputs.

Press Release Summary:

Featuring high-sensitivity Loss-Of-Signal (LOS) circuits suited for detecting small input signals, SY88343HL and SY88289HL connect to transimpedance amplifiers in fiber optic module, quantize their linear signal, and output them in low noise CML-level waveforms. ICs amplify input signals as small as 4 mVpp and are optimized to operate over range of data rates from 155 Mbps to 3.2 Gbps. They offer chatter-free open collector TTL LOS outputs with adjustable LOSlvl threshold.

Original Press Release:

Micrel Rolls Out New Higher Gain, High Sensitivity Post Amplifiers for Fiber Optic Receivers

SAN JOSE, Calif., Dec. 17 -- Micrel Inc., (NASDAQ:MCRL), an industry leader in analog, high bandwidth communications, and Ethernet IC solutions, today added two new solutions to its growing family of Post Amplifiers. The SY88343HL and SY88289HL are high-sensitivity, low-power CML limiting post amplifiers, designed with twice the signal gain of the previously announced SY88343DL and SY88289CL. These solutions are targeted at applications using low-cost transimpedance amplifiers and/or low gain PIN diodes which occur in a wide variety of data and telecomm 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. Both devices are currently in volume production with pricing for 1K quantities starting at $2.49.

"Higher gain, high-sensitivity post amplifiers exhibit better Bit Error Rate (BER) performance as a result of bigger eye opening when detecting and receiving very weak signals," said Thomas S. Wong, vice president high bandwidth products for Micrel. "These devices are recommended for systems that have stringent BER and low cost requirements."

In a fiber optic module, the devices connect to typical trans-impedance 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 quantize these signals and output them in low noise CML-level waveforms. 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 has the same footprint as all other Micrel Post Amplifiers which allow for flexible upgrades and interchangeability.

These solutions also feature high-sensitivity Loss-Of-Signal circuits which are ideal for detecting very small input signals. The new Post Amplifiers are intended for applications where the Receiver Optical Subassemblies (ROSAs) with low-cost/low-gain transimpedance amplifiers and/or a PIN Photodiodes are used. The devices have wide bandwidth, high gain, and are optimized to operate over a wide range of data rates, from 155Mbps to 3.2Gbps. Both Post Amplifiers have chatter-free open collector TTL LOS outputs with adjustable LOSlvl threshold. The ICs can amplify as low as 4mv signals to drive devices with CML and PECL inputs. Each device operates from a single 3.3V power supply, over temperatures ranging from -40-degC to +85- degC and come in a tiny 3mm x 3mm 16-pin MLF(R) package.

About Micrel, Inc.

Micrel Inc., is a leading global manufacturer of IC solutions for the worldwide analog, Ethernet and high bandwidth markets. The Company's products include advanced mixed-signal, analog and power semiconductors; high performance communication, clock management, Ethernet switch and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe and Asia. In addition, the Company maintains an extensive network of distributors and reps worldwide. Web:

Note: MLF is a registered trademark of Amkor Technology.

CONTACT: Julieanne DiBene, Marketing Communications of Micrel Inc., +1-408-474-1276,

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