SY88932L
3.3V, 4.25Gbps SONET/SDH Laser Driver
with Output Disable
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http:// www.micrel .c om
Februar y 2008
M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88932L is the smallest available laser driver with a
programmable modulation current up to 60mA for Fabry-
Perot (FP) or distribution feedback (DFB) lasers. The
device is suitable for SOENT/SDH applications with data
rates up to 4.25Gbps. The SY88932L accepts either CML
level or AC-coupled PECL inputs, and incorporates an
active lo w TT L /EN f unction w hich shu ts of f the m odulation
current when HIGH.
Datasheets and support documentation can be found on
Micrel’s web site at www.micr el.com.
Features
• Up to 4.25Gbps operation
• Modulation current to 60mA
• Rise/fall times 65ps typical
• Input 50Ω internally terminated to VCC
• TTL /EN with internal 75kΩ pull-down
• Designed for use with MIC3000 optical transceiver
management IC
• Voltage programmable laser modulation current
• Single 3.3V power supply
• Operating temperature range of –40°C to +85°C
• Available in tiny 16-pin QFN package
Applications
• Fiber optical module
• Transponder
• XAUI CWDM
• SONET/ SDH transmission system
• Add-drop MUX
• Metro area network
• 4.25Gbps optical transmitter
___________________________________________________________________________________________________________
Block Diagram
Micrel, Inc.
SY88932L
Februar y 2008 2 M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
Ordering Information
Part Number Package
Type Operating
Range Package Marking Lead
Finish
SY88932LMI QFN-16 Industrial 932L Sn-Pb
SY88932LMITR(1) QFN-16 Industrial 932L Sn-Pb
SY88932LMG QFN-16 Industrial 932L with
Pb-Free bar-line ind icat or Pb-Free
NiPdAu
SY88932LMGTR(1) QFN-16 Industrial 932L with
Pb-Free bar-line ind icat or Pb-Free
NiPdAu
Note:
1. Tape and Reel.
Pin Configuration
16-Pin QFN
Micrel, Inc.
SY88932L
Februar y 2008 3 M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number Pin Name Pin Function
2, 3 DIN, /DIN NRZ differential data (inputs), CML terminated interface with 50Ω to VCC.
1, 4, 7, 8, 13 GND Ground.
5, 6 VCC Positive power supply.
9, 10, 11, 12 OUT, /OUT Open collector (outputs) from the modulation driver.
14 VREF Voltage reference, nominally 1.25V with respect to ground.
15 VCNTRL Voltage control of IMOD. 5k Ω input impedance. See “Typical Operating Characteristics.”
16 /EN Enable: TTL-compatible active low input with 75kΩ pull-down resistor.
Truth Table(1,2)
D /D /EN OUT(3) /OUT
L H L H L
H L L L H
X X H H L
Notes:
1. Truth t abl e parameters are given for voltage rather than optical outputs. Hence, a voltage HIGH and OUT means no modulation current is
flowing through OUT, and a voltage LOW on OUT means modulation current is flowing through OUT. A voltage LOW implies an optical
HIGH, and vice versa.
2. L = LOW, H = HIGH, X = don’t care.
3. IOUT ≤ IMOD_OFF when /EN is HIGH.
Micrel, Inc.
SY88932L
Februar y 2008 4 M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Supply Voltage (VCC) .................................... –0.5V to +4.0V
CML Input Voltage (VIN) ..................VCC –1.0V to VCC +0.5V
TTL Control Input Voltage (VIN) ............................. 0V to VCC
Lead Temperature (soldering, 20sec.) ....................... 265°C
Storage Temperature (Ts) ......................... –65°C to +150°C
Operating Ratings(2)
Supply Voltage (VCC) .................................... +3.0V to +3.6V
Ambient Temperature (TA) .......................... –40°C to +85°C
Junction Temperature (TJ) ........................ –40°C to +120°C
Junction Thermal Resistance(3)
QFN
(θJA) Still-Air ....................................................... 61°C/W
(ψJB) Still-Air ....................................................... 38°C/W
DC Electrical Characteristics
VCC = 3.0V to 3.6V; GND = 0V; TA = –40°C to +85°C, Typical values at VCC = 3.3V, TA = 25°C.
Symbol Parameter Condition Min Typ Max Units
ICC Power Supply Current Note 4 57 80 mA
IMOD Modulation Current Range 10 60 mA
IMOD_OFF Modulation Off Current /EN = VIHEN 200 µA
VIR CML Input Voltage Range VCC–0.8 VCC+0.4 V
VID CML Input Differential Voltage
(DIN, /DIN) Note 5 400 800 1600 mVPP
VIHEN TTL Input HIGH Voltage (/EN) 2.0 V
VILEN TTL Input LOW Voltage (/EN) 0.8 V
VOUT Voltage (OUT, /OUT) Note 6 VCC–1.5 VCC V
VREF Reference Voltage Note 7 1.2 1.25 1.3 V
Notes:
1. Permanent device dam age may occur is Absolute Maximum Ratings are exceeded. Thi s is a stress rating only and functional operati on is not impli ed
at conditions other than thos e detailed in the operati onal sections of this datas heet. Exposed to Absolute Maxim um Rati ngs conditions for extended
periods may affect device reliabil ity.
2. The device is not guaranteed to functi on outside its operat i ng rating.
3. Therm al resistance numbers are 4-layer PCB. Thermal performance assumes exposed pad is soldered (or equivalent) to the same potential as the
ground pins on the PCB.
4. Excluding I MOD. I MOD set to 60mA with 25Ω load to VCC on OUT, /OUT. Inputs floating.
5. VID is the voltage required to guarantee a stable logic level. For logic “1”, DIN must be VID/2 above /DIN. For stable logic “0”, DIN must be VID/2 below
/DIN.
6. OUT and /OUT are current outputs. This specification defines the voltage range that the user must guarantee these pins remain within for proper
operation.
7. VREF intended to source/sink ≤ |5mA|.
Micrel, Inc.
SY88932L
Februar y 2008 5 M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
AC Electrical Characteristics(8)
VCC = 3.0V to 3.6V; GND = 0V; TA = –40°C to +85°C, Typical values at VCC = 3.3V, TA = 25°C.
Symbol Parameter Condition Min Typ Max Units
tr, tf Output Rise/Fall Times
(20% to 80%) Note 9 65 100 ps
DJ Deterministic Jitter Note 9, 10 20 psPP
Notes:
8. AC charact eristics are guaranteed by design and characterization.
9. IMOD = 60mA.
10. Determini st ic jitter m easured using K 28.5 pattern of 2.486Gbps, VID = 1600mVPP.
Typical Operating Characteristics
Micrel, Inc.
SY88932L
Februar y 2008 7 M9999-022008-F
hbwhelp@micrel.com or (408) 955-1690
PCB Thermal Consideration for 16-Pin QFN Package
Package Notes:
1. Package m eets Level 2 qualifications.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-10 00 WEB http://ww w .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 circuit ry and specific ations at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support applianc es , devic es or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or syst ems that (a) are
intended for surgical impl ant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury t o the user. A
Purchaser’s use or sale of Micrel Products for use in lif e support appliances, devices or syst ems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel f or any damages resulting from such use or sale.
© 2008 Micrel, Incorporated.
