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Micrel, Inc.
SDH/SONET 2.5Gbps LASER DIODE DRIVER
SY88922
SY88922
FEATURES
Up to 2.5Gbps operation 25mA peak drive current Separate modulation control Separate output enable for laser safety Differential inputs for data 75K input pulldown resistor Designed for use with SY88923, SY88904 or SY88905 Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88922 is a high-speed current switch for driving a semiconductor laser diode in optical transmission applications. The output current, or modulation current IMOD, is DC current controlled by IRSET, current through the resistor RSET. The output OUT is HIGH when output enable is HIGH. The device incorporates complementary open collector outputs with a capability of driving peak current of 25mA. The resistor REXT must be placed between /OUT and VCC to dissipate the worst case power. RSER is recommended to compensate for laser diode matching issues. The SY88922 utilizes the high performance bipolar ASSETTM technology.
APPLICATIONS
1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter 2.5Gb/s SDH/SONET
BLOCK DIAGRAM
VCC REXT OUT OUT RSER DIN DIN IMOD EN BIAS Control Internal Logic to Laser Diode
40X VCC GND GND RSET
Modulation Control
VREF
RSET
M9999-091906 hbwhelp@micrel.com or (408) 955-1690
Rev.: D Amendment: /0
1
Issue Date: September 2006
Micrel, Inc.
SY88922
PACKAGE/ORDERING INFORMATION
Ordering Information
/EN 1 DIN 2 /DIN 3 VREF 4 RSET 5 MSOP K10-1 10 VCC 9 OUT 8 /OUT 7 GND 6 GND
Part Number SY88922KC SY88922KCTR(1) SY88922KG SY88922KGTR(1)
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Commercial Commercial Commercial Commercial
Package Marking 922 922 922 with Pb-Free bar-line indicator 922 with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
10-Pin MSOP (K10-1)
Note: 1. Tape and Reel.
PIN NAMES
Pin VCC GND DIN, /DIN /EN Function Most positive power supply input, +5V for PECL operation. Ground These differential PECL 100K compatible inputs receive NRZ data. This PECL 100K compatible input enables Laser Driver. Modulation current goes to zero when asserted HIGH. Open collector outputs from the modulation buffer drive these differential current outputs. Voltage reference for use with RSET. An external resistor sets up the source current for modulation Imod.
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. H = IOUT = 0mA
OUT, /OUT VREF RSET
M9999-091906 hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88922
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC VI IO TA Tstore TJ Ptot Power Supply Voltage Input Voltage Output Current Operating Temperature Range Storage Temperature Range Maximum Operating Junction Temperature Power Dissipation Rating Value 0 to +7.0 0 to VCC 25 0 to +85 -55 to +125 +125 250 Unit V V mA C C C mW
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.
OPERATIONING CONDITIONS(1)
Symbol VCC REXT RSER RSET JA COUT Power Supply Voltage Resistor to Dissipate Power Laser Diode Serial Resistor Resistor to Adjust Current Thermal Resistance of Package to Ambient(2) Capacitance on OUT + /OUT Rating Value +4.5 to +5.5 10 to 50 0 to 50 1500 to 50,000 113 2.5 typical Unit V C/W pf
Notes: 1. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 2V. 2. Still air without heatsink.
DC ELECTRICAL CHARACTERISTICS
GND = 0V; VCC = +5.0V 10%; TA = 0C to + 85C
TA = 0C Symbol VIH VIL VREF IIL IIH ICC IOL IOUT IRSET ARSET Parameter Input HIGH Voltage (DIN, /DIN, /EN) Input LOW Voltage (DIN, /DIN, /EN) Reference Voltage Input LOW (DIN, /DIN, /EN) Current(1) Min. VCC-1165 VCC-1810 -- 0.5 -- -- -- 5 0.125 30 Typ. -- -- 3.12 -- -- 16 -- 15 -- 38 Max. VCC-880 Min. VCC-1165 TA = +25C Typ. -- -- 3.00 -- -- 16 -- 15 -- 38 Max. Min. TA = +85C Typ. -- -- 2.80 -- -- 16 -- 15 -- 38 Max. VCC-880 VCC-1475 -- -- 100 25 500 25 0.625 44 Unit mV mV V uA uA mA uA mA mA --
VCC-880 VCC-1165 VCC-1475 VCC-1810 -- -- 100 25 500 25 0.625 44 -- 0.5 -- -- -- 5 0.125 30
VCC-1475 VCC-1810 -- -- 100 25 500 25 0.625 44 -- 0.5 -- -- -- 5 0.125 30
Input HIGH Current (DIN, /DIN, /EN) Supply Current(2) Output LOW Current (/EN = HIGH) Modulation Current Modulation Control =IOUT/IRSET
Notes: 1. VI = VIL(Min.) 2. IMOD = 25mA. M9999-091906 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88922
AC ELECTRICAL CHARACTERISTICS(1)
IMOD =10mA; GND = 0V; VCC = +5V 10%; TA = 0C to + 85C.
TA = 0C Symbol tpd D tpd EN tr tf IOR Parameter Propagation Delay DIN - OUT Propagation Delay /EN - OUT Rise/Fall Time (20% to 80%) Output Current Ringing(2) Min. -- -- -- -- Typ. -- -- -- -- Max. 1000 1000 160 10 Min. -- -- -- -- TA = +25C Typ. 500 450 110 -- Max. 1000 1000 160 10 Min. -- -- -- -- TA = +85C Typ. -- -- -- -- Max. 1000 1000 160 10 Unit ps ps ps % Load = 25 Conditions
Notes: 1. REXT = RSER = 25 1%, RSER connects to VCC directly without Laser Diode. 2. IOH = 5 to 25mA
PERFORMANCE CURVES
IO and RSET 30
25
20
IO (mA)
15
10
5
0.0 0.0 2.0K
4.0K
6.0K
RSET (ohm)
8.0K
10K
12K
M9999-091906 hbwhelp@micrel.com or (408) 955-1690
4
SY88922
20k
68
68
VREF OUT DIN DIN
RSET
TX_DATA+
SY88922
EN
200
200
TX_DATA-
OUT
RSER
BLM21A102S
Laser Module
ENABLE/DISABLE
VCC
GND
APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION
GBIC Terminal
IBIAS
MD IBIAS SET
20k
REXT
VCC
24
The value of RSER depends on the Laser Diode.
SY88905
LOSOUT LOSIN
RX_LOS
IBIAS FB IPIN SET
20k
1000pF
VCC
Photodiode Laserdiode
VCC
VCC VCC
82 82
GND
VREF VCC
82
DIN DOUT DOUT
130
130
130
LOSLVL
0.1F
VCC
0.1F
VCC
GND
VREF
Micrel, Inc.
20k
130
RX_DATA-
SY88923
M9999-091906 hbwhelp@micrel.com or (408) 955-1690
RX_DATA+
DIN
82
EN
LOS
5
Micrel, Inc.
SY88922
10 LEAD MSOP (K10-1)
Rev. 00
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. (c) 2005 Micrel, Incorporated. M9999-091906 hbwhelp@micrel.com or (408) 955-1690
6

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