SY88343DL 3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal General Description Features The SY88343DL low-power, high-sensitivity, limiting, Single 3.3V power supply post amplifier is designed for use in fiber-optic receivers. 155Mbps to 3.2Gbps operation The device connects to typical transimpedance Low-noise CML data outputs amplifiers (TIAs). The linear signal output from TIAs can High-gain LOS contain significant amounts of noise and may vary in amplitude over time. The SY88343DL quantizes these Chatter-free open-collector TTL Loss-of-Signal (LOS) signals and outputs CML level waveforms. output with internal 4.75k pull-up resistor The SY88343DL operates from a single +3.3V power TTL /EN input o o supply, over temperatures ranging from 40 C to +85 C. Programmable LOS level set (LOS ) LVL With its wide bandwidth, high gain, and signals with data Ideal for mutil-rate applications rates up to 3.2Gbps and as small as 5mV can be PP Available in a tiny (3mm x 3mm) 16-pin QFN amplified to drive devices with CML inputs or AC- package coupled CML/PECL inputs. The SY88343DL generates a high-gain loss-of-signal Applications (LOS) open-collector TTL output. This function has a APON, BPON, EPON, GEPON, and GPON high-gain input stage for increased LOS sensitivity. A Gigabit Ethernet programmable loss-of-signal level set pin (LOS ) sets LVL 1X and 2X Fibre Channel the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the SONET/SDH : OC 3/12/24/48 STM 1/4/8/16 threshold set by LOS and de-asserts low otherwise. LVL High-gain line driver and line receiver The enable bar input (/EN) de-asserts the true output Markets signal without removing the input signal. The LOS output can be fed back to the /EN input to maintain FTTP output stability under a loss-of-signal condition. Optical transceivers Typically, 3.5dB LOS hysteresis is provided to prevent Datacom/Telecom chattering. Low-gain TIA interface All support documentation can be found on Micrels web Long reach FOM site at: www.micrel.com. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY88343DL Typical Application Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish SY88343DLMG QFN-16 Industrial 343D with Pb-Free bar line indicator NiPdAu Pb-Free (1) SY88343DLMGTR QFN-16 Industrial 343D with Pb-Free bar line indicator NiPdAu Pb-Free Note: 1. Tape and Reel. Pin Configuration 16-Pin QFN 2 M9999-021207-B February 2007 hbwhelp micrel.com or (408) 955-1690