SY84113BU Low Power 2.5V 1.25Gbps Limiting Post Amplifier with Ultra Wide LOS Range General Description Features The SY84113BU low power limiting post amplifier is Ultra-wide loss-of-signal (LOS) range (5mVpp to designed for use in fiber-optic optical modules for 100mVpp) multirate applications up to 1.25Gbps. The device Single 2.5V power supply connects to a typical transimpedance amplifier (TIA) and Ultra-low power consumption (55mW typical) can produce output signals to CML-level waveforms. 125Mbps to 1.25 Gbps operation Intended for the GbE and Fibre Channel applications, the SY84113BU offers a wide loss-of-signal (LOS) Low-noise CML data outputs range. It is able to detect input signals for as low as TTL /EN input 5mVpp and as high as 100mVpp. The SY84113BU is Programmable LOS level (LOS ) LVL intended to be used in AC-coupled input applications. Internal 50 termination The SY84113BU generates a LOS open-collector TTL Available in a tiny 3mm 3mm QFN package output. A programmable LOS level set pin (LOS ) sets LVL Extensive temperature range (40C to +95 C) the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOS and de-asserts low otherwise. LVL Applications The enable input (/EN) de-asserts the true output signal without removing the input signal. The LOS output can Gigabit Ethernet be fed back to the /EN input to implement the squelch Fibre Channel function that maintains output stability under an LOS GEPON condition. The SY84113BU operates on a single 2.5V power Markets supply and offers ultra-low power consumption. This device is perfectly suited to meet the stringent power Datacom/telecom requirements of the CSFP/SFP/SFF optical modules. Compact SFP/SFF optical transceiver All support documentation can be found on Micrels SFP/SFF optical transceiver website at: www.micrel.com. Typical Application Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY84113BU Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish SY84113BUMG QFN-16 Industrial 113B with Pb-Free Bar-Line Indicator NiPdAu Pb-Free (1) SY84113BUMGTR QFN-16 Industrial 113B with Pb-Free Bar-Line Indicator NiPdAu Pb-Free Notes: 1. Tape and Reel. Pin Configuration 16-Pin (3mm 3mm) QFN-16 Pin Description Pin Number Pin Name Type Pin Function /Enable: This input enables the outputs when LOW. Internally 15 /EN TTL Input connected to a 25k pull-up resistor and will default to a logic HIGH state if left open. Differential data inputs. Each input is internally terminated to the VREF 1, 4 DIN, /DIN Data Input pin by a 50 resistor. Reference Voltage: Place 0.1uF capacitor to Vcc to help stabilize 6 VREF LOSLVL. Loss-of-Signal Level Set. A resistor from this pin to V sets the CC 14 LOSLVL DC Input threshold for the data input amplitude at which LOS will be asserted. 2, 3, 10, Device Ground. Exposed pad (ePad) must be connected to PCB ground GND Ground 11, ePad plane. Open-Collector Loss-of-signal: asserts high when the data input amplitude falls below 7 LOS TTL Output the threshold set by LOS . LVL Differential data outputs. Unused output should be terminated 50 to 12, 9 /DOUT, DOUT CML Output VCC. Positive power supply Bypass with a 0.1uF 0.01uF low-ESR 5, 8, 13, 16 VCC Positive Rail capacitor as close to VCC pin as possible. 2 Revision 2.0 August 11, 2015 hbwhelp micrel.com or (408) 955-1690