SY88993AV SY88922V SY88905 K10-1 SY88993AVKC SY88922 SY88904 - Datasheet Archive

 

LIMITING POST AMPLIFIER DESCRIPTION FEATURES s s s s s s s s s SY88993AV FINAL > 3.2Gbps operation Low noise CML data outputs

 

5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER DESCRIPTION FEATURES s s s s s s s s s SY88993AV SY88993AV FINAL > 3.2Gbps operation Low noise CML data outputs Chatter-Free LOS generation Open Collector TTL LOS output TTL /EN Input Differential PECL inputs for data Single 3.3V or 5V power supply Designed for use with SY88922V SY88922V and SY88905 SY88905 Available in a tiny 10-pin (3mm) MSOP The SY88993AV SY88993AV limiting post amplifier with its high and wide bandwidth is ideal for use as a post amplifier in fiberoptic receivers with data rates up to 3.2Gbps. Signals as small as 4mVp-p can be amplified to drive devices with CML inputs or AC coupled PECL inputs. The SY88993AV SY88993AV generates a chatter-free Loss of Signal (LOS) open collector TTL output. The SY88993AV SY88993AV 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 3. PIN CONFIGURATION VCC SY88993AV SY88993AV /EN 1 DIN 2 /DIN 3 LOS 10 VCC 4.7k to 10k 9 DOUT MSOP K10-1 K10-1 8 /DOUT VREF 4 7 LOS LOSLVL 5 6 GND APPLICATIONS BLOCK DIAGRAM s 1.25Gbps and 2.1Gbps Gigabit Ethernet s 531Mbps, 1062Mbps and 2.5Gbps SONET/SDH Fibre Channel s 622Mbps s Gigabit interface converter (GBIC) s Small form factor trancievers s Parallel 10G Ethernet DIN Limiting Amplifer DOUT CML Buffer /DIN /DOUT VREF Enable VCC GND Level Detect LOS LOSLVL Rev.: B 1 /EN Amendment: /0 Issue Date: January 2001 Micrel SY88993AV SY88993AV PIN NAMES Pin GENERAL DESCRIPTION Type General The SY88993AV SY88993AV 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 SY88993AV SY88993AV limiting amplifier quantizes the signal and outputs a voltage-limited waveform. The /EN pin allows the user to disable the output signal without removing the input signal. Function DIN Data Input Data Input /DIN Data Input Inverting Data Input LOSLVL Input Loss of Signal Level Set /EN TTL Input Output Enable (Active Low) LOS TTL Output (Open Collector) Loss of Signal Indicator (Active High) GND Ground Ground DOUT CML Output Data Output /DOUT CML Output Inverting Data Output VCC Power Supply Positive Power Supply VREF Output Reference Voltage Output for LOS Level Set (see Fig. 3) ABSOLUTE MAXIMUM RATINGS(1) Symbol Rating Value Unit VCC Power Supply Voltage 0 to +7.0 V DIN, /DIN Input Voltage 0 to VCC V TA Operating Temperature Range ­40 to +85 °C Tstore Storage Temperature Range ­55 to +125 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. 2 Micrel SY88993AV SY88993AV DC ELECTRICAL CHARACTERISTICS VCC = +3.3V ±10% or +5V ±10%, RLOAD = 50 to VCC TA = ­40°C Symbol Parameter TA = 0°C TA = +25°C TA = +85°C Min. 5V 3.3V Max. Min. Max. Min. Typ. Max. Min. Max. Unit - - 55 50 - - 55 50 - - 43 40 55 50 - - 65 60 mA ICC Power Supply Current(1) IIL /EN Input LOW Current ­0.3(4) - ­0.3(4) - ­0.3(4) - - ­0.3(4) - mA IIH /EN Input HIGH Current - - 20(5) 100(6) - - 20(5) 100(6) - - - - 20(5) 100(6) - - 20(5) 100(6) µA IOH LOS Output Leakage(2) - 100 - 100 - - 100 - 100 uA LOSLVL LOSLVL Level VREF VCC VREF VCC VREF - VCC VREF VCC V VOL LOS Output Low Level(3) - 0.5 - 0.5 - - 0.5 - 0.5 V VREF Reference Voltage 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 - V - ±80 - ±80 - ±9 ±80 - ±80 mV VCC­0.2 GND±2 - VCC­0.2 VOFFSET Differential Output Offset VCMR Common Mode Range VCC ­1.38 VCC ­1.26 VCC ­1.38 VCC ­1.26 VCC ­1.38 VCC ­1.32 VCC ­1.26 VCC ­1.38 VCC ­1.26 GND±2 VCC­0.2 GND±2 NOTES: 1. No output load. 2. VOH = 5.5V. 3. IOL = +2mA. 4. VIN = 0.5V. 5. VIN = 2.7V. 6. VIN =VCC. 3 GND±2 VCC­0.2 V V Micrel SY88993AV SY88993AV AC ELECTRICAL CHARACTERISTICS VCC = +3.3V ±10% or +5V ±10%, RLOAD = 50 to VCC TA = ­40°C Symbol HYS Parameter TA = 0°C TA = +25°C TA = +85°C Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit LOS Hysteresis 2 8 2 8 2 4.6 8 2 8 dB Supply(1) PSRR Power Rejection Ratio - - - - - 35 - - - dB tOFFL LOS Release Time(2) Minimum Input - 0.5 - 0.5 - 0.1 0.5 - 0.5 µs tOFFH LOS Release Time(2) Maximum Input - 0.5 - 0.5 - 0.1 0.5 - 0.5 µs tONL LOS Assert Time(2) - 0.5 - 0.5 - 0.2 0.5 - 0.5 µs tr tf Differential Output(3) Rise/Fall Time (20%-80%) - 120 - 120 - 60 120 - 120 ps VID Input Voltage Range 4 1800 4 1800 4 - 1800 4 1800 mVp-p 1200 600 - mVp-p VOD Differential Output Voltage Swing(4) VSR LOS Sensitivity Range 600 - 600 - 600 800(5) 4 50 4 50 4 - 50 4 50 mVp-p VCC ­20 VCC VCC ­20 VCC VCC ­20 VCC ­5 VCC VCC ­20 VCC mV - VCC ­300 mV Output Spec (DOUT and /DOUT) VOH Output HIGH Voltage VOL Output LOW Voltage(6) - VCC ­300 - VCC ­300 - ZO Single-Ended Output(7) Impedance 40 60 40 60 40 50 60 40 60 VCC ­400 VCC ­300 Input Spec (DIN and /DIN) AV(Diff) Differential Voltage Gain - - - - - 39 - - - dB B­3dB 3dB Bandwidth - - - - - 2.5 - - - GHz S21 Single-Ended Small Signal-Gain 26 - 26 - 26 33 - 26 - dB NOTES: 1. Input referred noise = RMS output noise/low frequency gain. Input referred, 55MHz. 2. Input is a 200MHz square wave, tr < 300ps, 1.8Vp-p. 3. With input signal VID > 50mVp-p with 50 load. 4. Input is a 200MHz square wave, tr < 300ps, 50 load. 5. VID > 10mVp-p. 6. Output levels are based on 50 impedance. If the load impedance is different, the output level will be changed. 7. See output structure. 4 Micrel SY88993AV SY88993AV APPLICATION NOTE Output Termination The SY88993AV SY88993AV outputs must be terminated with a 50 load to VCC. 50 50 Layout and PCB Design Since the SY88993AV SY88993AV 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 power supply. The SY88993AV SY88993AV 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. ESD STRUCTURE VCC VCC DOUT 50 Z0 = 50 /DOUT Z0 = 50 16mA VCC GND ESD STRUCTURE Figure 2. Differential Output Configuration 22nF DIN VCC /DIN 50 50 22nF R1 LOSLVL R2 VREF 0.1µF GND VREF Figure 1. Differential Input Configuration NOTES: 1. Resistor Divider = R2/ (R1 + R2) 2. R1 + R2 5k Figure 3. LOSLVL Circuit PRODUCT ORDERING CODE Ordering Code Operating Range SY88993AVKC SY88993AVKC 5 Package Type K10-1 K10-1 Commercial 50 Micrel SY88993AV SY88993AV PERFORMANCE CURVE LOS Assert and Deassert Levels vs LOSLVL 100 90 3.3V TA = 25°C 2.5Gbps Pattern 223-1 80 70 60 50 INPUT LEVEL (mVp-p) INPUT LEVEL (mVp-p) 100 90 LOS Assert and Deassert Levels vs LOSLVL 40 30 20 10 0 0 60 50 40 30 20 10 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC ­ V (V) 5.0V TA = 25°C 2.5Gbps Pattern 223-1 80 70 0 Figure 4. Figure 5. LOS Assert and Deassert Levels vs LOSLVL LOS Assert and Deassert Levels vs LOSLVL 100 90 3.3V TA = 25°C 2.5Gbps Pattern 27-1 70 60 INPUT LEVEL (mVp-p) INPUT LEVEL (mVp-p) 100 90 80 50 40 30 20 10 0 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC ­ V (V) 60 50 40 30 20 10 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC ­ V (V) Figure 6. 5.0V TA = 25°C 2.5Gbps Pattern 27-1 80 70 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC ­ V (V) Figure 7. 6 SY88993AV SY88993AV Micrel APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION GBIC Terminal TX_DATA+ VCC DIN /DIN /EN VCC VREF RSET SY88922 SY88922 GND 68 200 RSER IBIAS SET 20k 0.1µF DIN /DIN 0.1µF IBIAS Laserdiode IBIAS FB VCC 2M 0.1µF 1000pF VCC Laser Module MD RWIN VCCDET 22nF 22nF From Transimpedance Amp. 0.1µF Photodiode VCC OUT /OUT 20k VCC 20k ILIMIT SET SY88904 SY88904 IPIN SET VCC 20k VREF 0.1µF TX_OUT TX_FAULT TX_DISABLE GND /EN SY88993AV SY88993AV VREF 20K 7 TX_DATA­ TX_FAULT 200 68 LOSOUT LOSIN LOS DOUT /DOUT LOSLVL VCC 50 TX_DISABLE RX_LOS RX_DATA+ RX_DATA­ GND 0.1µF 50 0.01µF 0.01µF 0.01µF 0.01µF Micrel SY88993AV SY88993AV 10 LEAD MSOP (K10-1 K10-1) Rev. 00 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 2001 Micrel Incorporated 8