SY84113BUMG

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 designed for use in fiber-optic optical modules for multirate applications up to 1.25Gbps. The device connects to a typical transimpedance amplifier (TIA) and can produce output signals to CML-level waveforms. Intended for the GbE and Fibre Channel applications, the SY84113BU offers a wide loss-of-signal (LOS) range. It is able to detect input signals for as low as 5mVpp and as high as 100mVpp. The SY84113BU is intended to be used in AC-coupled input applications. The SY84113BU generates a LOS open-collector TTL output. A programmable LOS 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 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 implement the squelch function that maintains output stability under an LOS condition. The SY84113BU operates on a single 2.5V power supply and offers ultra-low power consumption. This device is perfectly suited to meet the stringent power requirements of the CSFP/SFP/SFF optical modules. All support documentation can be found on Micrel’s website at: www.micrel.com. • Ultra-wide loss-of-signal (LOS) range (5mVpp to 100mVpp) • Single 2.5V power supply • Ultra-low power consumption (55mW typical) • 125Mbps to 1.25 Gbps operation • Low-noise CML data outputs • TTL /EN input • Programmable LOS level (LOSLVL) • Internal 50Ω termination • Available in a tiny 3mm × 3mm QFN package • Extensive temperature range (–40°C to +95°C) Applications • Gigabit Ethernet • Fibre Channel • GEPON Markets • Datacom/telecom • Compact SFP/SFF optical transceiver • SFP/SFF optical transceiver _________________________________________________________________________________________________________ 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 August 11, 2015 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish QFN-16 Industrial 113B with Pb-Free Bar-Line Indicator NiPdAu Pb-Free QFN-16 Industrial 113B with Pb-Free Bar-Line Indicator NiPdAu Pb-Free SY84113BUMG (1) SY84113BUMGTR Notes: 1. Tape and Reel. Pin Configuration 16-Pin (3mm × 3mm) QFN-16 Pin Description Pin Number Pin Name Type 15 /EN TTL Input /Enable: This input enables the outputs when LOW. Internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open. 1, 4 DIN, /DIN Data Input Differential data inputs. Each input is internally terminated to the VREF pin by a 50Ω resistor. 6 VREF 14 LOSLVL DC Input 2, 3, 10, 11, ePad GND Ground 7 LOS Open-Collector TTL Output Loss-of-signal: asserts high when the data input amplitude falls below the threshold set by LOSLVL. 12, 9 /DOUT, DOUT CML Output Differential data outputs. Unused output should be terminated 50Ω to VCC. 5, 8, 13, 16 VCC Positive Rail Positive power supply. . Bypass with a 0.1uF || 0.01uF low-ESR capacitor as close to VCC pin as possible. August 11, 2015 Pin Function Reference Voltage: Place 0.1uF capacitor to Vcc to help stabilize LOSLVL. Loss-of-Signal Level Set. A resistor from this pin to VCC sets the threshold for the data input amplitude at which LOS will be asserted. Device Ground. Exposed pad (ePad) must be connected to PCB ground plane. 2 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Absolute Maximum Ratings(2) Operating Ratings(3) 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 ......................................... –800µA to +500µA LOSLVL Voltage ................................................. VREF to VCC Lead Temperature (soldering, 20s) .......................... 260°C Storage Temperature (Ts) ....................... –65°C to +150°C Supply Voltage (VCC) ...................... +2.375 to +2.625V Ambient Temperature (TA).................. –40°C to +95°C Junction Temperature (TJ) ................ –40°C to +120°C (4) Package Thermal Resistance (θJA) Still-Air ................................................ 60°C/W (ψJB) ............................................................ 33°C/W DC Electrical Characteristics VCC = 2.5 ±5%; TA = –40°C to +95°C, typical values at VCC = 2.5V, TA = 25°C. Symbol Parameter Condition Min. Typ. ICC Power Supply Current Outputs terminated 50Ω to Vcc LOSLVL LOSLVL Voltage VREF VOH DOUT, /DOUT HIGH Voltage VCC – 0.020 VOL DOUT, /DOUT LOW Voltage VCC – 0.475 VREF Reference Voltage Z0 Single-Ended Output Impedance 40 50 60 Ω ZI Single-Ended Input Impedance 40 50 60 Ω Min. Typ. Max. Units Vcc V 22 Max. Units 35 mA VCC V VCC – 0.005 VCC V VCC – 0.400 VCC – 0.350 V Vcc – 0.6 V TTL DC Electrical Characteristics VCC = 2.5 ±5%; TA = –40°C to +95°C, typical values at VCC = 2.5V, TA = 25°C. Symbol Parameter Condition VIH /EN Input HIGH Voltage VIL /EN Input LOW Voltage IIH /EN Input HIGH Current VIN = VCC IIL /EN Input LOW Current VIN = 0.5V 2.0 VOH LOS Output HIGH Level Vcc = 2.5V. IOH < 50uA VOL LOS Output LOW Level IOL = 2mA 0.8 V 20 µA –0.3 mA 2 V 0.5 V Notes: 2. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings conditions for extended periods may affect device reliability. 3. The datasheet limits are not guaranteed if the device is operated beyond the operating ratings. 4. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. ψJB uses a 4-layer and θJA in still air unless otherwise stated. August 11, 2015 3 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU AC Electrical Characteristics VCC = 2.5 ±5%; TA = –40°C to +95°C, typical values at VCC = 2.5V, TA = 25°C.; RLoad = 50Ω to VCC; Symbol tr , tf tJITTER Parameter Typ. Max. Units Note 5 150 260 ps Deterministic Note 6 15 Random Note 7 Output Rise/Fall Time (20% to 80%) VID Differential Input Voltage Swing VOD Differential Output Voltage Swing Condition Min. psPP 5 5 Note 5 700 800 psRMS 1800 mVPP 950 mVPP TOFF LOS Release Time Note 10 2 10 µS TON LOS Assert Time Note 10 2 10 µS LOSAL Low LOS Assert Level RLOSLVL = 10kΩ (8) LOSDL Low LOS De-assert Level RLOSLVL = 10kΩ (8) HYSL Low LOS Hysteresis RLOSLVL = 10kΩ (8) LOSAM LOSDM Medium LOS Assert Level Medium LOS De-assert Level RLOSLVL = 5kΩ (8) RLOSLVL = 5kΩ (8) (9) HYSM Medium LOS Hysteresis RLOSLVL = 5kΩ LOSAH High LOS Assert Level RLOSLVL = 100Ω (8) LOSDH High LOS De-assert Level RLOSLVL = 100Ω (8) RLOSLVL = 100Ω (9) 3.9 mVPP 5.6 2 3.1 7 9.2 mVPP 4.5 mVPP 13.6 16 2 3.4 4.5 60 73 2 dB mVPP dB mVPP 103 130 3.0 4.5 mVPP HYSH High LOS Hysteresis B-3dB 3dB Bandwidth 850 MHz AV(Diff) Differential Voltage Gain 38 dB S21 Single-Ended Small-Signal Gain 32 dB 26 dB Notes: 5. Amplifier in limiting mode. Input is a 200MHz square wave. 6. Deterministic jitter measured using 1.250 Gbps K28.5 pattern, VID = 60mVPP. 7. Random jitter measured using 1.250Gbps K28.7 pattern, VID = 60mVPP. 8. See “Typical Operating Characteristics” for a graph showing how to choose a particular RLOSLVL for a particular LOS assert and its associated de-assert amplitude. 9. This specification defines electrical hysteresis as 20log (LOS De-Assert/LOS Assert). The ratio between optical hysteresis and electrical hysteresis is found to vary between 1.5 and 2 depending upon the level of received optical power and ROSA characteristics. Based on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2dB-4.5 dB, shown in the AC characteristics table, will be 1dB-3dB Optical Hysteresis. 10. In real world applications, the LOS Release/Assert time can be strongly influenced by the RC time constant of the AC-coupling cap and the 50Ω input termination. To keep this time low, use a decoupling cap with the lowest value that is allowed by the data rate and the number of consecutive identical bits in the application (typical values are in the range of 0.001µF to 1.0µF). August 11, 2015 4 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Typical Functional Characteristics VCC = 2.5 ±5%; TA = –40°C to +95°C, typical values at VCC = 2.5V, TA = 25°C.; RLoad = 50Ω to VCC. Typical Operating Characteristics VCC = 2.5 ±5%; TA = –40°C to +95°C, typical values at VCC = 2.5V, TA = 25°C.; RLoad = 50Ω to VCC. LOS Assert/De-Assert Levels LOS Hysteresis 1000 6 Hysteresis (dB) Amplitude (mV) 5 100 10 4 3 2 1 1 0.1 1 10 0.1 LOSLVL Resistor (KOhm) August 11, 2015 1 10 LOSLVL Resistor (KOhm) 5 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Functional Block Diagram August 11, 2015 6 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Functional Description The SY84113BU is a high-sensitivity limiting post amplifier that operates from a single +2.5V power supply over temperatures from –40°C to +85°C. Signals with data rates up to 1.25Gbps, and as small as 5mVpp, can be amplified. Figure 1 shows the allowed input voltage swing. The SY84113BU generates a LOS output signal that can be fed back to /EN for output stability in the absence of a signal at the input. LOSLVL sets the sensitivity of the input amplitude detection. SY84113BU offers ultra wide LOS detection range. This allows the device to be used in multiple AC-coupled applications. Hysteresis The SY84113BU provides typically 3dB LOS electrical hysteresis, which is defined as 20log (VINLOS-Assert / VINLOS-De-Assert). Because the relationship between the voltage out of the ROSA to optical power at its input is linear, the optical hysteresis will be typically half of the electrical hysteresis reported in the datasheet, but in practice the ratio between electrical and optical hysteresis is found to be within the range 1.5 - 1.8. Thus 3dB electrical hysteresis will correspond to an optical hysteresis within the range 1.7dB - 2dB. Input Amplifier/Buffer Figure 2 shows a simplified schematic of the input stage. The high-sensitivity of the input amplifier can detect and amplify AC-coupled signals as small as 5mVpp to full CML output level. The input stage also can allow signals as large as 1800mVpp. Input signals are amplified with a typically 38dB differential voltage gain until they reach the limiting mode of the amplifier. SY84113BU outputs in standard 400mV CML output levels. Output Buffer The SY84113BU’s CML output buffer is designed to drive 50Ω lines and is internally terminated with 50Ω to VCC. Figure 3 shows a schematic of the output stage. Loss-of-Signal (LOS) The SY84113BU generates a chatter-free LOSs-ofsignal (LOS) open-collector TTL output as shown in Figure 4. LOS is used to determine that the input amplitude is too small to be considered as a valid input. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. LOS can be fed back to the enable (/EN) input to maintain output stability under a LOSs of signal condition. /EN de-asserts low the true output signal without removing the input signals. Typically, 3dB LOS hysteresis is provided to prevent chattering. LOS Level Set A programmable LOS level set pin (LOSLVL) sets the threshold of the input amplitude detection. Connecting an external resistor between VCC and LOSLVL sets the voltage at LOSLVL. This voltage ranges from VCC to VREF. The external resistor creates a voltage divider between VCC and VREF, as shown in Figure 5. August 11, 2015 7 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Figure 1. VIS and VID Definition Figure 2. Input Structure Figure 3. Output Structure Figure 4. LOS Output Structure Figure 5. LOSLVL Setting Circuit Note: Recommended value for RLOSLVL is 15kΩ or less. August 11, 2015 8 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Package Information and Recommended Land Pattern(11) 16-Pin (3mm × 3mm) QFN (QFN-16) Note: 11. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. August 11, 2015 9 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU Package Information and Recommended Land Pattern(11) (Continued) August 11, 2015 10 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY84113BU MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network of distributors and reps worldwide. Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. August 11, 2015 11 Revision 2.0 hbwhelp@micrel.com or (408) 955-1690