SY88343BL 3.3V, 3.2Gbps CML Limiting Post Amplifier with High Gain TTL Loss-of-Signal General Description Features The SY88343BL low-power limiting post amplifier is Single 3.3V power supply designed for use in fiber-optic receivers. The device DC to 3.2Gbps operation connects to typical transimpedance amplifiers (TIAs) Low-noise CML data outputs that are AC-coupled. The linear signal output from TIAs High gain LOS can contain significant amounts of noise and may vary in amplitude over time. The SY88343BL quantizes these Chatter-free Open-Collector TTL Loss-of-Signal (LOS) output with internal 4.75k pull-up resistor signals and outputs CML-level waveforms. The SY88343BL 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 and high gain, signals with data Ideal for multi-rate applications rates up to 3.2Gbps and as small as 5mV can be PP Available in a tiny 10-pin EPAD-MSOP and 16-pin amplified to drive devices with CML inputs or AC- QFN package coupled CML/PECL inputs. The SY88343BL generates a high-gain loss-of-signal Applications (LOS) open-collector TTL output. The LOS function has APON, BPON, EPON, and GPON a high gain input stage for increased sensitivity. A programmable loss-of-signal level set pin (LOS ) sets Gigabit Ethernet LVL the sensitivity of the input amplitude detection. LOS Fibre Channel asserts high if the input amplitude falls below the OC-3 and OC-12/24 SONET/SDH 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 signal without removing the input signal. The LOS Markets output can be fed back to the /EN input to maintain output stability under a loss-of-signal condition. FTTP Typically, 3.5dB LOS hysteresis is provided to prevent Optical transceivers chattering. Datacom/Telecom Datasheet and support documentation can be found on Low-gain TIA interface Micrels web site at: www.micrel.com. Long reach FOM Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY88343BL Typical Application Pin Configuration 10-Pin EPAD-MSOP (K10-2) 16-Pin QFN Ordering Information Package Operating Lead Part Number Package Marking Type Range Finish SY88343BLEY K10-2 Industrial 343B with Pb-Free bar line indicator Matte-Sn (1) SY88343BLEYTR K10-2 Industrial 343B with Pb-Free bar line indicator Matte-Sn NiPdAu SY88343BLMG QFN-16 Industrial 343B with Pb-Free bar line indicator Pb-Free NiPdAu (1) SY88343BLMGTR QFN-16 Industrial 343B with Pb-Free bar line indicator Pb-Free Note: 1. Tape and Reel. 2 M9999-021707-B February 2007 hbwhelp micrel.com or (408) 955-1690