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Micrel, Inc.
3.3V, 2.7Gbps SDH/SONET LASER DRIVER WITH AUTOMATIC POWER CONTROL
DESCRIPTION
SY88952L
SY88952L
FEATURES
s s s s s s s s s s Single 3.3V power supply Up to 2.7Gbps operation Rise/Fall times: < 75ps Independent programmable laser modulation and bias currents Bias current to 100mA and modulation current to 90mA Automatic average laser power control Bias and modulation current monitors Operating temperature range of -40C to +85C Complies with ANSI, ITU, and Bellcore SDH/SONET specifications Available in DIE form and 32-pin (5mm x 5mm) EPAD-MLFTM package
APPLICATIONS
s s s s s s OC-48 transceivers and transponders SONET/SDH transmission system Add drop mux Metro area network 2.5Gbps optical transmitter Fiber optical module
SY88952L is a highly integrated and programmable laser driver for SONET/SDH application up to 2.7Gbps. The device accepts differential PECL or LVDS data and clock inputs. It provides programmable bias and modulation currents for driving a laser. The modulation output of SY88952L can be DC-coupled to drive the laser diode, providing a significant power saving over ACcoupled operation. A synchronizing TTL input latch can be used to reduce jitter if a clock signal is available. A TTL enable is also incorporated in the device. EN only enables/disables IMOD. It does not enable/disable IBIAS. An automatic power controller (APC) is integrated into SY88952L to maintain a constant average optical output power over temperature and lifetime. The modulation current can be externally temperature compensated to minimize the variation of extinction ratio of the optical output. Several safety features will enable an alarm function when the output signal is too high, or bias current is too high. There are two alarm conditions: 1. /FAIL asserts when bias current loop goes to maximum of it's range. IBIAS and IMOD still flow under this condition. 2. /FAIL asserts when IBIASMAX or IMODSET are too high (implying IBIAS or IMOD will be too high). All currents will shut off under this condition.
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc. M9999-082205 hbwhelp@micrel.com or (408) 955-1690
Rev.: B Amendment: /0
1
Issue Date: August 2005
Micrel, Inc.
SY88952L
PACKAGE/ORDERING INFORMATION
VCC BIASMAX MODSET VEE VEE VEE SLOW MD
Ordering Information(1)
Part Number Package Type MLF-32 MLF-32 MLF-32 MLF-32 Operating Range Industrial Industrial Industrial Industrial Package Marking SY88952L SY88952L SY88952L with Pb-Free bar-line indicator SY88952L with Pb-Free bar-line indicator Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
32 31 30 29 28 27 26 25
VCC D /D VCC CLK /CLK VCC LATCH
1 2 3 4 5 6 7 8
24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16
VCC /Q /Q VCC Q Q VCC VEE
SY88952LMI SY88952LMITR(2) SY88952LMG SY88952LMGTR(2)
Notes:
VEE BIASMON MODMON /FAIL VEE VEE BIAS
EN
1. 2.
Dice are designed to operate from -40C to +85C, but are tested and guaranteed to TA = +25C only. Tape and Reel.
32-Pin MLFTM (MLF-32)
PIN DESCRIPTION
Pin Number 16 11 31 26 5, 6 2, 3 9 8 25 19, 20, 22, 23 12 30 13 1, 4, 7, 18, 21, 24, 32 10, 14, 15, 17, 27, 28, 29, EP Pin Name BIAS BIASMON BIASMAX SLOW CLK,/CLK D, /D EN LATCH MD Q, /Q MODMON MODSET /FAIL VCC VEE Pin Function Bias Current Output (IBIAS). Bias Current Monitor: Sinks current that is proportional to IBIAS, (IBIAS /40). An external current path must exist to VCC. A resistor (RBIASMAX) connected to ground sets the maximum bias current. See "Typical Operating Characteristics" (IBIAS vs. RBIASMAX). Connect a capacitor (CSLOW) to ground to provide a slow-start. Differential Clock Input. 75K pull-down on CLK, 75k pull-up and 75k pull-down on /CLK. Differential Data Input. 75K pull-down on D, 75k pull-up and 75k pull-down on /D. TTL Input with 75k pull-up: Default HIGH for normal operation; LOW to disable modulation current. TTL Input with 75k pull-up: Default HIGH for latched (clocked) data; LOW for direct data. Connect this pin to a monitor photodiode anode, a resistor (RAPCSET) and a capacitor (CAPCSET). This sets the desired average optical power. Differential Output: Modulation current output (IMOD). Modulation Current Monitor: Sinks current that is proportional to IMOD, (IMOD /45). An external current path must exist to VCC. A resistor (RMODSET) connected to ground sets the modulation current. See "Typical Operating Characteristics" (IMOD vs. RMODSET). TTL Open-Collector Output: Connect a 5k resistor to VCC. Indicates APC failure when LOW. Positive Power Supply. Device Ground: Ensure the exposed pad is also connected to ground.
TRUTH TABLE(1)
D L H X /D H L X EN H H L OUT(2) H L H /OUT L H L 2
Note 1. Note 2. L = LOW, H = HIGH, X = don't care. H = IOUT IMOD_OFF.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88952L
Absolute Maximum Ratings(1)
Supply Voltage (VCC) ..................................... +0V to +7.0V Input Voltage (VIN) ............................................ +0V to VCC Output Current (IOUT) ............................................... 100mA Lead Temperature (soldering, 10 sec.) ..................... 300C Storage Temperature (TS) ....................... -65C to +150C
Operating Ratings(2, 3)
Supply Voltage (VCC) .................................. +3.0V to +3.6V Ambient Temperature (TA) ......................... -40C to +85C Junction Temperature (TJ) ........................................ 120C Package Thermal Resistance MLFTM (JA) still-air ..................................................... 34C/W (JB) still-air ..................................................... 19C/W
DC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V; VEE = GND; RLOAD = 5; TA = -40C to +85C Symbol ICC IBIAS IMOD IMOD_OFF VID VICMR VIH VIL VOL IOH Parameter Supply Current Bias Current Range Modulation Current Range Modulation Off Current Differential Input Voltage Common Mode Range TTL Input HIGH Voltage TTL Input LOW Voltage /FAIL Output LOW Voltage /FAIL Output Leakage Current Note 6 Note 7 Condition Note 4 Note 5 Note 5 Note 6 200 VCC -1.49 2.0 1 1 Min Typ Max 85 100 90 750 1600 VCC -VID/4 VCC 0.8 0.5 100 Units mA mA mA A mVPP V V V V A
Notes: 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. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. 4. 5. 6. 7. 8. Devices are ESD sensitive. Handling precautions recommended. Excluding actual IBIAS and IMOD output currents. Voltage at Q, /Q must not drop below VCC -1.5V. Voltage BIAS, MODMON and BIASMON must not drop below VCC -2V. EN = LOW. IOL = +2mA. VOH = 3.6V.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88952L
AC ELECTRICAL CHARACTERISTICS(9)
VCC = 3.0V to 3.6V; VEE = GND; TA = -40C to +85C; typical values @VCC = 3.3V, TA = 25C, IMOD = 40mA, IBIAS = 50mA, RLOAD = 5 Symbol CID PWD tS tH tr, tf
Notes: 9. AC characteristics are guaranteed by design and characterization. 10. Measured with 622Mbps 0-1 pattern, latch = HIGH. 11. PWD = (Wider pulse - narrower pulse) /2.
Parameter Maximum Consecutive Identical Digits Pulse Width Distortion Latch Set-Up Time Latch Hold Time Output Rise/Fall Time (20% to 80%)
Condition
Min 80
Typ
Max
Units bits
Note 10, 11 40 40
50
ps ps ps
75
ps
TIMING DIAGRAM
tCLK = 400ps CLK tS D tH
Setup/Hold Time Definition
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88952L
TYPICAL OPERATING CHARACTERISTICS(NOTE 1)
VCC = 3.3V, TA = 25C, unless otherwise stated.
IMOD vs. RMODSET
160 140 120 IMOD (mA) IBIAS (mA) 100 80 60 40 20 0 10 100 1000 RMODSET () 10000 160 140 120 100 80 60 40 20 0 10
IBIAS vs. RBIASMAX
Modulation-Current Monitor Gain vs. Temperature
60 50 40 30 IMOD = 10mA, IBIAS = 10mA 20 10 0 -40 -20 0 20 40 60 TEMPERATURE (C) 80 GAIN (IMOD/IMODMON) IMOD = 40mA, IBIAS = 50mA
100 1000 RBIASMAX ()
10000
60 GAIN (IBIAS/IBIASMON) 50 40
Bias-Current Monitor Gain vs. Temperature
IMOD = 40mA, IBIAS = 50mA
IAPCSET vs. RAPCSET
2
1.5 30 IMOD = 10mA, IBIAS = 10mA 20 10 0 -40 -20 0 20 40 60 TEMPERATURE (C) 80 0 1 10 RAPCSET (K) 100 IAPCSET (mA)
1
0.5
Note 1.
IBIAS and IMOD must never exceed 100mA and 90mA, respectively.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
5
Micrel, Inc.
SY88952L
BLOCK DIAGRAM
VCC LATCH
/Q 0 Q D CLK EN VCC 100 BIAS BIASMON VCC MD 100 MODMON IMOD 45 Failure Detect VREF SLOW MODSET BIASMAX /FAIL 5k VCC RAPCSET CAPCSET IBIAS 40 X40 X40 D Q MUX 1 RD
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
RBIAS MAX
RMODSET
CSLOW
6
Micrel, Inc.
SY88952L
32 LEAD EPAD-Micro LEADFRAMETM (MLF-32)
Package EP- Exposed Pad
Die
CompSide Island
Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane
PCB Thermal Consideration for 32-Pin MLFTM Package (Always solder to equivalent or PCB)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet 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. (c) 2005 Micrel, Incorporated. M9999-082205 hbwhelp@micrel.com or (408) 955-1690
7

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