SY88149HLMG Microchip

SY88149HL 3.3V 1.25Gbps Burst-Mode Limiting Amplifier with Ultra-Fast Signal Assert Timing General Description Features The SY88149HL is a high-sensitivity, burst-mode capable Single 3.3V power supply limiting post amplifier designed for Optical Line Terminal <5ns SD assert (LOS de-assert) time (OLT) receiver applications. The SY88149HL satisfies the Option to AUTORESET or Manual RESET LOS output strict timing restrictions of the GPON standards by to HIGH and SD output to LOW providing ultra-fast Loss-of-Signal (LOS) or Signal-Detect Option to select LOS or SD output (SD) output. Auto Reset and Manual Reset options are provided to control LOS/SD output timing. For increased Up to 1.25Gbps operation flexibility, this device also includes an option to select Low-noise differential LVPECL data outputs between LOS or SD output. The device can be connected 4mVpp input sensitivity to burst-mode capable transimpedance amplifiers (TIAs) High sensitivity LOS/SD detect using AC or DC coupling. Ultra fast LVTTL LOS/SD output The SY88149HL generates a high-gain LOS or SD LVTTL Squelching function to disable output output. A programmable LOS/SD level pin (LOS/SD ) LVL sets the sensitivity of the input amplitude detection. This Programmable LOS/SD level set (LOS/SD ) LVL device also offers the option to choose between a Loss-of- Available in a 16-pin (3mmx 3mm) QFN package Signal (LOS) and a Signal-Detect (SD) output from the LOS/SD pin based the LOS/SDSEL pin setting. To select Applications SD output, leave LOS/SDSEL pin open or connect to Vcc GE-PON/GPON/EPON OLT to select LOS output, tie LOS/SDSEL-to-ground. If the input signal amplitude falls below the threshold set by Gigabit Ethernet LOS/SD , LOS will assert high (or SD will de-assert low). LVL Fibre Channel Once the input signal rises above the threshold set by OC-3/12/24 SONET/SDH LOS/SD , LOS will de-assert low (or SD output will LVL High-gain line driver and line receiver assert high). The SY88149HL also features a JAM function which, when active, disables the LVPECL outputs. JAM is Low-gain TIA interface active LOW when SD is selected and active HIGH when Markets LOS is selected. The LOS/SD output should be fed back to the JAM input to maintain output stability under an invalid FTTH/FTTP signal condition. Typically, 3dB SD hysteresis is provided Datacom/Telecom to prevent chattering. Optical transceiver The SY88149HL operates from a single +3.3V power o o supply over temperatures ranging from 40 C to +85 C. With its wide bandwidth and high gain, signals up to 1.25Gbps and as small as 4mVpp can be amplified to drive devices with LVPECL inputs. All support documentation can be found on Micrels web 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. SY88149HL Ordering Information Part Number Package Operating Package Marking Lead Type Range Finish SY88149HLMG QFN-16 Industrial 149H with NiPdAu Pb-Free bar-line indicator Pb-Free (1) SY88149HLMGTR QFN-16 Industrial 149H with NiPdAu Pb-Free bar-line indicator Pb-Free Pin Configuration 16-Pin QFN Truth Tables LOS/SDSEL Function LOS/SD Output (JAM Input) OUTPUTS High SD High Enabled High SD Low Disabled Low LOS Low Enabled Low LOS High Disabled M9999-061110-I June 2010 2 hbwhelp micrel.com or (408) 955-1690