SY88313BLEY

SY88313BL 3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier with TTL Loss-of-Signal General Description The SY88313BL low-power limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers (TIAs). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88313BL quantizes these signals and outputs CML-level waveforms. The SY88313BL operates from a single +3.3V ±10% supply, over temperatures ranging from –40°C to +85°C. With its wide bandwidth and high gain, signals with data rates up to 3.2Gbps, and as small as 10mVPP, can be amplified to drive devices with CML inputs or ACcoupled CML/PECL inputs. The SY88313BL generates a loss-of-signal (LOS) opencollector TTL output. A programmable loss-of-signal level set pin (LOSLVL) sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. The enable bar input (/EN) de-asserts the true output signal without removing the input signal. The LOS output can be fed back to the /EN input to maintain output stability under a loss-of-signal condition. Typically, 3.4dB LOS hysteresis is provided to prevent chattering. Datasheet and support documentation cab be found on Micrel’s web site at: www.micrel.com. Features • Single 3.3V power supply • DC to 3.2Gbps operation • Low-noise CML data outputs • Chatter-free Open-Collector TTL loss-of-signal (LOS) output with internal 4.75kΩ pull-up resistor • TTL /EN input • Internal 50Ω input termination • Programmable LOS level set (LOSLVL) • Ideal for multi-rate applications • Available in a tiny 10-pin EPAD MSOP and 16-pin QFN package Applications • APON/BPON, GEPON, EPON, and GPON • Gigabit Ethernet • Fibre Channel • OC-3/12/24/48 SONET/SDH • High-gain line driver and line receiver • Low-gain TIA interface Markets • FTTP/FTTH • Datacom/Telecom • Optical Transceivers _______________________________________________________________________________________________________ Typical Application Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com February 2007 M9999-021207-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY88313BL Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish SY88313BLMG QFN-16 Industrial 313B with Pb-Free bar-line indicator NiPdAu Pb-Free QFN-16 Industrial 313B with Pb-Free bar-line indicator NiPdAu Pb-Free K10-2 Industrial 313B with Pb-Free bar-line indicator Matte-Sn Pb-Free K10-2 Industrial 313B with Pb-Free bar-line indicator Matte-Sn Pb-Free (2) SY88313BLMGTR SY88313BLEY (2) SY88313BLEYTR Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. Pin Configuration 16-Pin QFN February 2007 10-Pin EPAD-MSOP (K10-2) 2 M9999-021207-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY88313BL Pin Description Pin Number (MSOP) Pin Number (QFN) Pin Name Type 1 15 /EN TTL Input: Default is high. 2 1 DIN Data Input True data input with 50Ω termination to VREF. 3 4 /DIN Data Input Complementary data input with 50Ω termination to VREF. 4 6 VREF 5 14 LOSLVL Input: Default is maximum sensitivity 6 Exposed Pad 2, 3, 10, 11 Exposed Pad GND Ground 7 7 LOS Open Collector TTL Output with Internal 4.75kΩ pull-up resistor 8 9 /DOUT CML Output Complementary data output. 9 12 DOUT CML Output True data output. 10 5, 8, 13, 16 VCC Power Supply February 2007 Pin Function Enable Bar: De-assert true data output when high. Reference Voltage: Placing a capacitor here to VCC helps stabilize LOSLVL. Loss-of-Signal Level Set: A resistor from this pin to VCC sets the threshold for the data input amplitude at which the LOS output will be asserted. Device ground. Exposed pad must be connected to PCB ground plane. Loss-of-Signal: Asserts high when the data input amplitude falls below the threshold set by LOSLVL. Positive power supply. 3 M9999-021207-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY88313BL Operating Ratings(2) Absolute Maximum Ratings(1) Supply Voltage (VCC) ........................... +3.0V to +3.6V Ambient Temperature (TA).................. –40°C to +85°C Junction Temperature (TJ) ................ –40°C to +120°C (3) Junction Thermal Resistance QFN (θJA) Still-air .................................................. 61°C/W (ψJB) .............................................................. 38°C/W Supply Voltage (VCC) ..................................... +0V to +4.0V Input Voltage (DIN, /DIN) .......................................0 to VCC Output Current (IOUT) .............................................. ± 25mA /EN Voltage ............................................................0 to VCC VREF Current ............................................................ ±1mA LOSLVL Voltage............................................... VREF to VCC Lead Temperature (soldering, 20sec.) ................... +260°C Storage Temperature (Ts) ........................ -65°C to +150°C EPAD-MSOP (θ JA) Still-air .................................................. 38°C/W (ψJB) .............................................................. 22°C/W DC Electrical Characteristics VCC = 3.0V to 3.6V; RL = 50Ω to VCC; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min ICC Power Supply Current No output load. LOSLVL LOSLVL Voltage VOH CML Output HIGH Voltage VOL CML Output LOW Voltage VOFFSET Differential Output Offset ZO Single-Ended Output Impedance 40 ZI Single-Ended Input Impedance 40 VREF Reference Voltage Typ 47 VREF VCC = 3.3V Max Units 65 mA VCC V V VCC-0.020 VCC-0.005 VCC VCC-0.475 VCC-0.400 VCC-0.350 V ±80 mV 50 60 Ω 50 60 Ω VCC-1.28 V TTL DC Electrical Characteristics VCC = 3.0V to 3.6V; RL = 50Ω to VCC; TA = –40°C to +85°C, unless otherwise stated. Symbol Parameter Condition Min Typ Max Units 0.8 V 20 100 µA µA VIH /EN Input HIGH Voltage VIL /EN Input LOW Voltage 2.0 V IIH /EN Input HIGH Current VIN = 2.7V VIN = VCC IIL /EN Input LOW Current VIN = 0.5V -0.3 mA VOH LOS Output HIGH Level VCC ≥ 3.3V, IOH (max)