Micrel, Inc. 5V/3.3V 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ SY88913V SY88913V DESCRIPTION 3.3V and 5V power supply options Up to 1.5Gbps operation Low power Low noise Chatter-Free /LOS Generation PECL /LOS Output TTL /EN Input Differential PECL inputs for data /EN input is TTL with internal 27K pull up Single power supply The SY88913V limiting post amplifier with its high gain and wide bandwidth is ideal for use as a post amplifier in fiber-optic receivers with data rates up to 1.5Gbps. Signals as small as 5mVp-p can be amplified to drive devices with PECL inputs. The SY88913V generates a chatter-free PECL Loss of Signal (/LOS) output. The SY88913V incorporates a programmble level detect function to identify when the input signal has been lost. This information can be fed back to the /EN input of the device to maintain stability under loss of signal conditions. Using LOSLVL pin the sensitivity of the level detect can be adjusted. The LOSLVL voltage can be set by connecting a resistor divider between VCC and VREF, Figure 2. Figure 3 and 4 show the relationship between input level sensitivity and the voltage set on LOSLVL. ■ Designed for use with Micrel-Synergy laser diode driver and controller ■ Available in a tiny 10-pin (3mm) MSOP APPLICATIONS ■ ■ ■ ■ 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter BLOCK DIAGRAM M9999-071310 [email protected] or (408) 955-1690 1 Rev.: D Amendment: /0 Issue Date: July 2010 Micrel, Inc. SY88913V PACKAGE/ORDERING INFORMATION Ordering Information Part Number 16-Pin MSOP (K10-1) Package Type Operating Range Package Marking Lead Finish SY88913VKC K10-1 Commercial 913V Sn-Pb SY88913VKCTR(1) K10-1 Commercial 913V Sn-Pb SY88913VKG K10-1 Industrial 913V with Pb-Free bar-line indicator Pb-Free NiPdAu SY88913VKGTR(1) K10-1 Industrial 913V with Pb-Free bar-line indicator Pb-Free NiPdAu Note: 1. Tape and Reel. PIN NAMES Pin GENERAL DESCRIPTION Type DIN Data Input Data Input /DIN Data Input Inverting Data Input General The SY88913V is an integrated limiting amplifier intended for high-frequency fiber-optic applications. The circuit connects to typical transimpedance amplifiers found within a fiber-optics link. The linear signal output from a transimpedance amplifier can contain significant amounts of noise, and may vary in amplitude over time. The SY88913V limiting amplifier quantizes the signal and outputs a voltagelimited waveform. The TTL /EN pin allows the user to disable the signal without removing the input signal. Function LOSLVL Input /EN TTL Input Output Enable (active Low) Loss of Signal Level Set /LOS PECL Output Loss of Signal Indicator (active Low) GND Ground Ground DOUT PECL Output Data Output /DOUT PECL Output Inverting Data Output VCC Power Supply Positive Power Supply VREF Output Reference Voltage Output for LOS Level Set (see Fig. 2) M9999-071310 [email protected] or (408) 955-1690 2 Micrel, Inc. SY88913V ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC Rating Power Supply Voltage DIN, /DIN Input Voltage DOUT, /DOUT, /LOS Output Voltage (with 50Ω load) Value Unit 0 to +7.0 V 0 to VCC V VCC –2.5 to VCC +0.3 V LOSLVL Input Voltage 0 to VCC V VREF Output Voltage VCC –2.0 to VCC V TA Operating Temperature Range –40 to +85 °C Tstore Storage Temperature Range °C TJUNCTION Max Junction Temperature –55 to +125 125 °C Note: 1. 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 ratlng conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS VCC = +3.3V ±10% or +5V ±10%, RLOAD = 50Ω to VCC –2V TA = –40°C Symbol Parameter ICC Power Supply Current(1) IIL /EN Input LOW Current 5V 3.3V IIH /EN Input HIGH Current VCMR TA = 0°C TA = +25°C TA = +85°C Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit — — 35 35 — — 35 35 — — 21 23 35 35 — — 40 40 mA –0.3(5) — –0.3(5) — –0.3(5) — — –0.3(5) — mA — — 20 100(3) — — 20 100(3) — — — — 20 100(3) — — 20 100(3) µA (2) (2) Common Mode Range GND +2.0 VCC –1.0 GND +2.0 VCC –1.0 GND +2.0 — (2) (2) VCC –1.0 GND +2.0 VCC –1.0 V Voffset Differential Output Offset — ±160 — ±160 — ±40 ±160 — ±160 mV LOSLVL LOSLVL Level VREF VCC VREF VCC VREF — VCC VREF VCC V VOH DOUT and /DOUT HIGH Output VCC –1085 VCC –1025 VCC –880 mV VOL DOUT and /DOUT LOW Output VCC –1830 VCC –1555 VCC –1810 VCC –1620 VCC –1810 VCC –1705 VCC –1620 VCC –1810 VCC –1620 mV VREF Reference Supply(4) VCC –1.38 VIH /EN Input HIGH Voltage 2.0 — 2.0 — 2.0 — — 2.0 — V VIL /EN Input LOW Voltage — 0.8 — 0.8 — — 0.8 — 0.8 V VCC –880 VCC –1025 VCC –880 VCC –1.26 VCC –1.38 VCC –1.26 Notes: 1. No Output Load. 2. VIN = 2.7V. 3. VIN = VCC. 4. IREF must be limited to be within –0.8mA (source) and 0.5mA (sink). 5. VIN = 0.5V. M9999-071310 [email protected] or (408) 955-1690 3 VCC –1025 VCC –1.38 VCC –955 VCC –880 VCC –1.32 VCC –1.26 VCC –1.38 VCC –1.26 V Micrel, Inc. SY88913V AC ELECTRICAL CHARACTERISTICS VCC = +3.3V ±10% or +5V ±10%, RLOAD = 50Ω to VCC –2V. TA = –40°C Symbol PSRR Parameter Min. Max. TA = 0°C TA = +25°C Min. Max. Min. Typ. Power Supply(1) — — — — — 35 Rejection Ratio VID Input Voltage Range VOD Differential Output Voltage Swing(2) tOFFL TA = +85°C Max. Min. Max. Unit Conditions — — — dB Input referred, 55MHz 5 1800 5 1800 5 — 1800 5 — 200 — — — 200 — — — 200 700 250 — — — 200 — — mV mV /LOS Release Time(3) Minimum Input — 0.5 — 0.5 — 0.1 0.5 — 0.5 µs tONL /LOS Assert Time(3) — 0.5 — 0.5 — 0.2 0.5 — 0.5 µs tOFFH /LOS Release Time(4) Maximum Input — 0.5 — 0.5 — 0.1 0.5 — 0.5 µs VSR /LOS Sensitivity Range 5 50 5 50 5 — 50 5 50 HYS /LOS Hysteresis 2 8 2 8 2 4.6 8 2 8 — — 260 — — — 260 — — — 170 trin,tfin 260 — — — tr, tf Output Rise/Fall Time Notes: 1. Input referred noise = RMS output noise/low frequency gain. 2. Input is 622MHz square wave. 3. Input is a 200MHz square wave, tr < 300ps, 8mVPP. 4. Input is a 200MHz square wave, tr < 300ps, 1.8VPP. M9999-071310 [email protected] or (408) 955-1690 4 1800 mVPP VID = 15mVPP VID = 5mVPP mVPP dB 260 ps — VID > 100mVPP VID < 100mVPP Micrel, Inc. SY88913V APPLICATION NOTE Output Termination The SY88913V outputs must be terminated with a 50Ω load to VCC –2V (or Thevenin equivalent). The SY88913V ground pin should be connected to the circuit board ground. Use multiple PCB vias close to the part to connect to ground. Avoid long, inductive runs which can degrade performance. Layout and PCB Design Since the SY88913V is a high-frequency component, performance can largely be determined by board layout and design. A common problem with high-gain amplifiers is feedback from the large swing outputs to the input via the power supply. Figure 1. Differential Input Configuration Figure 2. LOSLVL Circuit Notes: LOSLVL = VCC –1.32 + R2 × 1.32 R1 + R2 R1 + R2 ≥ 5kΩ M9999-071310 [email protected] or (408) 955-1690 5 Micrel, Inc. SY88913V PERFORMANCE CURVE LOS Assert and Deassert Levels vs LOS LVL 100 3.3V T A = 25°C 1.25Gbps Pattern 2 7 -1 90 80 70 60 80 70 60 50 40 40 30 20 30 20 10 10 0 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOS LVL = V CC – V (V) 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOS LVL = V CC – V (V) Figure 4. 5.0V LOS Assert and Deassert Levels vs. LOSLVL Figure 3. 3.3V LOS Assert and Deassert Levels vs. LOSLVL M9999-071310 [email protected] or (408) 955-1690 5.0V T A = 25°C 1.25Gbps Pattern 2 7 -1 90 50 0 LOS Assert and Deassert Levels vs LOS LVL 100 6 Micrel, Inc. SY88913V 10 LEAD MSOP (K10-1) 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 The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-071310 [email protected] or (408) 955-1690 7