SY84782U Low Power 2.5V 1.25Gbps FP/DFB Laser Diode Driver General Description Features The SY84782U is a single 2.5V supply, ultra-low power, 2.5V power supply option small form factor laser diode driver for telecom/datacom Ultra low power consumption (63mW typ) applications. Intended to drive FP/DFB lasers at data rates Multirate up to 1.25Gbps up to 1.25Gbps, it is especially useful for Compact SFP, Fast rise and fall time SFP, and SFF modules where power requirements are quite stringent. The driver can deliver modulation current Modulation current up to 90mA up to 90mA and offers a high compliance voltage, all of Laser can be DC- or AC-coupled which make the SY84782U suitable for high current Small form factor 16-pin (3mm 3mm) QFN package operations in both AC- and DC-coupled applications. MIC3003G compatible The SY84782U is intended to be used with Micrels Extensive temperature range (40C to +95 C) MIC3003 Optical Transceiver Management IC, which allows for both modulation and bias current control and Applications monitoring. Furthermore, the MIC3003 offers power control Multirate LAN, MAN applications: Fibre Channel, GbE, and temperature compensation. SONET OC3/12/24, and SDH STM1/4/8 This device operates across the industrial temperature CSFP/SFF/SFP optical modules range (40C to +95C) and is available in a small 3mm 3mm QFN package. All datasheets and support documentation can be found . on Micrels website at: www.micrel.com Typical Application DC-Coupled Laser AC-Coupled Laser Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY84782U Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish SY84782UMG QFN-16 Industrial 782U Pb-Free Bar-Line Indicator Pb-Free (1) SY84782UMG TR QFN-16 Industrial 782U Pb-Free Bar-Line Indicator Pb-Free Note: 1. Tape and Reel Pin Configuration 16-Pin QFN Pin Description Pin Number Pin Name Pin Function GND, 1, 4, 7, Device Ground. Ground and exposed pad must be connected to the plane of the most negative 8, 13 potential. ePad 2 DIN+ Non-Inverting Input Data. Internally terminated with 50 to a reference voltage 3 DIN- Inverting Input Data. Internally terminated with 50 to a reference voltage 5, 6 VCC Supply Voltage. Bypass with a 0.1F 0.01F low-ESR capacitor as close to VCC pin as possible. 9, 10 MOD- Inverted Modulation Current Output. Provides modulation current when input data is negative 11, 12 MOD+ Non-Inverted Modulation Current Output. Provides modulation current when input data is positive. 14 VREF Reference Voltage. Install a 0.1F capacitor between VREF and VCC Modulation current setting and control. The voltage applied to this pin will set the modulation current. 15 IM SET To be connected to the MIC3003 Pin 24 (VMOD+). Input impedance 25k. Enable Pin. A high level signal applied to this pin will pull the MOD+ output HIGH and MOD- output 16 /EN LOW. Internally pulled down with a 75k resistor. Truth Table (2) (3) DIN+ DIN- /EN MOD+ MOD- Laser Output L H L H L L H L L L H H X X H H L L Notes: 2. I = 0 when MOD+ = H. MOD 3. Assuming that laser is tied to MOD+. Revision 2.0 August 11, 2015 2 hbwhelp micrel.com or (408) 955-1690