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Micrel, Inc.
3.3V 3.2Gbps SONET/SDH LASER DRIVER
DESCRIPTION
SY88912L
SY88912L
FEATURES
s s s s s s s Up to 3.2Gbps operation Modulation current to 60mA Rise/Fall times <70PS Single 3.3V power supply Programmable laser modulation current Operating temperature range of -40C to 85C Available in tiny 16-pin MLFTM package
The SY88912L is the smallest laser driver with programmable modulation current for SONET/SDH applications up to 3.2Gbps. The device accepts either PECL or CML level data inputs. The SY88912L provides modulation current of up to 60mA for FP (Fabry-Perot) or DFB (Distributed Feedback) laser. There is a 75k pull-down resistor to VEE at the input of /EN. An active low PECL enable signal shuts off modulation current.
APPLICATIONS
s s s s s s s Fiber optical module Transponder XAUI CWDM SONET/SDH transmission system Add-drop mux Metro area network 2.5Gbps optical transmitter
BLOCK DIAGRAM
VCC REXT
VCC
VCC
/OUT OUT
DIN /DIN
Internal Logic
/EN
BIAS Control
IMOD
VCC GND
IBIAS
VREF RSET
RSET
GND
MLF and Micro LeadFrame are trademarks of Amkor Technology, Inc. M9999-081005 hbwhelp@micrel.com or (408) 955-1690
Rev.: B Amendment: /0
1
Issue Date: August 2005
Micrel, Inc.
SY88912L
PACKAGE/ORDERING INFORMATION
GND GND VCC
Ordering Information
Part Number
12 11 10 9
/EN
16
15
14
13
Package Type MLF-16 MLF-16 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 912L 912L 912L with Pb-Free bar-line indicator 912L with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
DIN GND GND /DIN
1 2 3 4 5 6 7 8
OUT OUT /OUT /OUT
SY88912LMI SY88912LMITR(1) SY88912LMG SY88912LMGTR(1)
Note: 1. Tape and Reel.
VREF
VCC
16-Pin MLFTM (MLF-16)
RSET
GND
PIN NAMES
Pin DIN, /DIN /EN GND OUT, /OUT RSET VCC VREF Function NRZ differential data inputs. PECL compatible active low input. Most negative power supply input. Open collector outputs from the modulation driver. An external resistor between VREF and RSET defines the modulation current. Most positive power supply input. Voltage reference for use with RSET.
TRUTH TABLE(1)
D L H X /D H L X /EN L L H OUT(2) H L H /OUT L H L
Notes: 1. L = LOW, H = HIGH, X = don't care. 2. IOUT IMOD_OFF when /EN is HIGH.
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88912L
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC VIN IOUT Tstore TA PD JA(2) JB
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. JEDEC standard test boards with DIE attach pads soldered to PCB.
Parameter Power Supply Voltage Input Voltage Output Current Storage Temperature Operating Temperature Power Dissipation Package Thermal Resistance (Junction-to-Ambient) Package Thermal Resistance (Junction-to-Board) -Still-Air
Value 0 to +5.0 0 to VCC 65 -55 to +125 -40 to +85 500 59 32.1
Unit V V mA C C mW C/W C/W
OPERATING CONDITIONS
Symbol VCC REXT RSET
Note:
1.Refer to VOUT specification.
(1)
Parameter Power Supply Voltage Resistor to Dissipate Power Resistor to Set IMOD
Value +3.15 to +3.45 5 (Min.) 100 to 10,000
Unit V
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88912L
DC ELECTRICAL CHARACTERISTICS
VCC = 3.15 to 3.45V; GND = 0V; TA = -40C to +85C
Symbol ICC IMOD IMOD_OFF VIDDIN VIHDIN VILDIN VIHEN VILEN VOUT VREF
Notes:
1. 2. 3. 4. Excluding IMOD. IMOD 60mA Typical values are under VCC = 3.3V and TA = 25C. VIDDIN is the voltage required to guarantee a stable logic level. For a logic "1", DIN must be VIDDIN above /DIN. For stable logic "0", DIN must be VIDDIN below /DIN. OUT and /OUT are current outputs. This specification defines the voltage range that the user must guarantee these pins remain within proper operation.
Parameter Power Supply Current(1) Current(2)
Min. -- 10 -- 200 VCC -1.7 VCC -1.9 VCC -1165 VCC -1810 VCC -1.5 1.7
Typ.(2) 65 -- -- -- -- -- -- -- -- 1.9
Max. 80 60 200 1600 VCC -0.1 VCC -0.3 VCC -880 VCC -1475 VCC V
Unit mA mA A mVPP V V mV mV V
Condition IMOD = 60mA /EN = VIHEN
(3)
Modulation Current Range Modulation Off
Input Differential Voltage, DIN, /DIN Input HIGH Voltage, DIN, /DIN Input LOW Voltage, DIN, /DIN Input HIGH Voltage, /EN Input LOW Voltage, /EN Output Voltage, OUT, /OUT Reference Voltage1.5
(4)
AC ELECTRICAL CHARACTERISTICS(1)
VCC = 3.15 to 3.45V; GND = 0V; TA = -40C to +85C
Symbol DJ tr, tf
Notes:
1. AC characteristics are guaranteed by design and characterization. 2. IMOD = 40mA, 25 resistors each tied from OUT and /OUT to VCC. 3. IMOD = 40mA, 2.5Gbps, 0-1 pattern, BW = 12KHz to 20MHz.
Parameter Jitter Generation(2),(3) Rise/Fall Times(2) (20% to 80%)
Min. -- --
Typ. -- 65
Max. 20 --
Unit ps ps
Condition peak-to-peak
70 60 50 IMOD (mA) 40 30 20 10 0 0.1
IMOD vs. RSET
1 RSET (k)
10
Figure 1. IMOD vs. RSET
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88912L
16 LEAD EPAD-Micro LEADFRAMETM (MLF-16)
Rev. 01
Package EP- Exposed Pad
Die
CompSide Island
Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane
PCB Thermal Consideration for 16-Pin MLFTM Package
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 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. (c) 2005 Micrel, Incorporated. M9999-081005 hbwhelp@micrel.com or (408) 955-1690
5

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