SY88073L 1G to 12.5G Limiting Post Amplifier with Programmable Decision Threshold Revision 1.0 Features General Description Multi-rate operation from 1.0625Gbps to 12.5Gbps The SY88073L limiting post amplifier is designed for use in Adjustable decision threshold level for offset fiber-optic receivers for continuous mode, multi-rate compensation or BER optimization applications from 1Gbps to 12.5Gbps. Wide differential input range (10mV to 1800mV ) PP PP The SY88073L contains a high-bandwidth, high-sensitivity Wide SD de-assert or LOS assert threshold range input stage with user-programmable, wide-range SD assert/LOS de-assert threshold levels, which enables 4.5mV to 30mV PP PP optimized system reach. Typically, 4dB of electrical 4dB typical electrical hysteresis hysteresis is provided to minimize LOS or SD chattering Fast SD assert and LOS de-assert times caused by noisy input signals. A logic level control pin is 1s typical 2s maximum provided to enable user selection of an open-collector, Selectable LOS or SD status signal indicator TTL-compatible LOS or SD status indication signal with an external 5k to 10k pull-up resistor. Selectable RXOUT+/RXOUT polarity inversion TTL-compatible JAM input with internal pull-up The SY88073L provides faster SD assert and LOS de- assert times (than typical continuous mode devices) over Low-noise CML data inputs with integrated 50 the entire differential input voltage range of 10mV to termination impedance to internal reference V PP REF 1800mV . PP Low-noise CML data outputs with integrated 50 termination impedance The SY88073L input stage also provides a user-adjustable decision threshold circuit to optimize BER in noisy 30ps typical rise/fall times applications such as WDM, where EDFA and Raman Wide range power supply: 3.3V 10% amplifiers contribute uneven noise levels. By applying an Industrial temperature range: 40C to +85C external control voltage, the decision threshold can Available in a tiny 3mm x 3mm QFN package typically be adjusted from 30% to 70% from the nominal 50% threshold when the circuit is disabled. The SY88073L provides integrated 50 input and output Applications impedances to optimize the high-speed signal paths and 10G/8G Fibre Channel reduce component count. The post amplifier outputs have 10Gigabit Ethernet user-selectable polarity inversion control to simplify PCB layout. A TTL-compatible JAM input is provided to enable OTN Equipment a SQUELCH function by feeding back the LOS or SD SONET OC192 SDH STM64 signal. The JAM input disables only the post amplifier WDM/DWDM systems output. The SY88073L operates from a single +3.3V power supply, over temperatures ranging from 40C to +85C. Markets Datasheets and support documentation are available on Fibre Channel Storage Area Networks Micrels web site at: www.micrel.com. Datacom/Enterprise High-performance computing Telecom Wireless Base Stations . Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY88073L Typical Application Circuit Fixed Decision Threshold Typical Application Circuit Adjustable Decision Threshold Note: V from DAC output or other voltage source. CPA Revision 1.0 November 8, 2013 2 HBWhelp micrel.com or (408) 955-1690