SY88022L
11.3Gbps Laser Diode Driver
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2009
M9999-102809-A
hbwhelp@micrel.com or (408) 955-1690
Description
The SY88022L is a single 3.3V supply, small form factor
driver for telecom/datacom applications using FP/DFB
lasers at data r ates up to 1 1.3Gbps. The dr iver can de liver
modulation current up to 60mA and a bias current up to
80mA
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
.
Features
• Operates from a single 3.3V supply
• Operation up to 11.3Gbps
• Modulation current up to 60mA
• Bias current up to 80mA
• Available in a small form factor 3mm x 3mm QFN
package
Applications
• Multi-rate LAN, MAN applications up to 11.3Gbps:
8xFC, 10G GbE, SONET OC-192 and SDH ST M-64
• SFP+, XFP, XPAK, XENPAK, X2, MSA 300 optical
modules
__________________________________________________________________________________________
Typical Application
Micrel, Inc.
SY88022L
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Ordering Information(1)
Part Number Voltage Temperature Range Package Lead Finish
SY88022LMG 3.3V –40° to +85°C QFN-16 NiPdAu Pb-Free
SY88022LMGTR(2) 3.3V –40° to +85°C QFN-16 NiPdAu Pb-Free
Notes:
1. Contact f act ory for die availabi lit y. Dice are guaranteed at TA = +25°C, DC Electricals only.
2. Tape and Reel.
Pin Configuration
16-Pin QFN
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SY88022L
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Pin Description
Pin Number Pin Name Pin Function
1, 4, 9, 12 VCC Supply Voltage. Bypass with a 0.1µF//0.01µF low ESR capacitor as close to the VCC
pins as possible.
8, 14 GND Ground. Ground and exposed pad must be conne cted to the plane of the most negative
potential.
2 DIN+ Non-inverting input data. Internally terminated with 50Ω to VCC.
3 DIN– Inverting input data. Internally terminated with 50Ω to VCC.
5 MODSET Modulation current setting and control. Apply a voltage within the range 0V to1.2V to
this pin to set the modulat ion cur rent. Input impedance 25kΩ.
6 /EN Active Low TTL. Internal 75kΩ pull down to GND. The driver is enabled when this pin is
unconnected or /EN is asserted low and disabled when /EN asserted high.
7 EQSET Install a resistor from this pin to GND to set the desired equalization level. 0Ω will
provide max imum equ aliz at ion and 2kΩ or higher will provide negligible equalization.
Leave open if no equalization is needed.
10 MOD– Inverted modulation current output. Provides modulation current when input data is
negative.
11 MOD+ Non-inverted modulation current output. Provides modulation current when input data is
positive.
13 BIAS BIAS Current Output.
15 BIASMON Bias Current Monitor. Install an external resistor from this pin to GND to convert the
output current to a voltage proportional to the bias current.
16 BIASSET Bias current setting and control. Apply a voltage within the range 0V to 1.2V to this pin
to set the bias current. Input impedance 25kΩ.
Truth Table
DIN+ DIN- /EN MOD+(1) MOD- Laser Output(2)
L H L H L L
H L L L H H
X X H H H L
Notes:
1. IMOD = 0 when MOD+ = H.
2. Assum i ng that the laser cathode is tied to MOD+.
Micrel, Inc.
SY88022L
October 2009 4 M9999-102809-A
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) ..................................... –0.5V to +4.0V
CML Input Voltage (VIN) .................... VCC–1.2V to VCC+0.5V
TTL Control Input Voltage (VIN) ............................. 0V to VCC
Lead Temperature (soldering, 20sec.) ..................... +260°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
Package Thermal Resistance(3)
QFN
(θJA) Still-air .................................................... 60°C/W
(ψJB) ................................................................ 33°C/W
DC Electrical Characteristics
TA = –40°C to +85°C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25°C, IMOD =
30mA, IBIAS = 3 0mA.
Symbol Parameter Condition Min Typ Max Units
ICC Power Supply Current M odulation and bia s curren ts
excluded 65 95
(4)
mA
VMOD_MIN Minimum Voltage Required at the
Driver Output (headroom) for Proper
Operation
1.2 V
VBIAS_MIN Minimum Voltage Required at the
BIAS Output (headroom) for Proper
Operation
1.2 V
RIN Input Resistance, Single Ended 45 50 55 Ω
VID Differential Input Voltage Swing 100 1000 mVpp
VIL /EN Input Low 0.8 V
VIH /EN Input High 2 V
IBIAS Bias Current 10 80 mA
IBias_OFF Bias OFF Current Current at BIAS when the device is
disabled 150 µA
RMODSET Input Resistance at MODSET Pin 25 kΩ
VMODSET Voltage Range at MODSET Pin IMOD range 10mA to 60mA 1.2 V
RBIASSET Input Resistance at BIASSET Pin 25 kΩ
VBIASSET Voltage Range at BIASSET Pin IBIAS range 10mA to 80mA 1.2 V
Notes:
1. Exceeding the absolute maximum rati ng may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Package Therm al Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. θJB uses a
4-layer and θJA in still air unless otherwise stated.
4. Maximum ICC measured with IMOD = 60mA and IBIAS = 80mA and MOD+/MOD- tied t o VCC.
Micrel, Inc.
SY88022L
October 2009 5 M9999-102809-A
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AC Electrical Characteristics
TA = –40°C to +85°C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25°C, IMOD =
30mA, IBIAS = 3 0mA.
Symbol Parameter Condition Min Typ Max Units
Data Rate NRZ 11.3 Gbps
IMOD
(5)
Modulation Current AC-coupled 10 60
(6)
mA
IMOD_OFF Modulation OFF Current Current at MOD+ and MOD- when
the device is disabl ed 150 µA
tr Output Current Rise Time 20% to 80%, 25Ω load 25 35 ps
tf Output Current Fall Time 20% to 80%, 25Ω load 25 35 ps
DJ Deterministic Jitter K25.8 pattern at 11.3Gbps,
VIN = 200mVPP 4 psPP
RJ Random Jitter K25.8 pattern at 11.3Gbps,
VIN = 200mVPP 0.3 psPP
Notes:
5. IMOD is defined as the current going into the external load, which is equal to the total current of the output device subtracted by the current goi ng i nto
the internal 50Ω pull-up.
6. IMOD(MAX) i s defi ned for a 25Ω external load.
Micrel, Inc.
SY88022L
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Typical Characteristics
IBIAS / IBIASMON
vs IBIAS
50
60
70
80
90
100
110
120
10 30 50 70 80 90
IBIAS (mA)
Bias Gain
0
10
20
30
40
50
60
70
80
90
100
200 400 600 800 1000 1200
VBIASSET (mV)
Modulation Gain
0
10
20
30
40
50
60
70
80
50 250 450 650 850 1050
VMODSET (mV)
Note:
IMOD is defined for a 25Ω external load.
Functional Characteristics
Micrel, Inc.
SY88022L
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Input and Output Stages
Figure 1a. Simplified Input Stage
Figure 1b. Simplified Output Stage
Interfacing the Input to Differential Logic Drivers
Figure 2a. AC-Coupling to LVPECL Driver
Figure 2b. AC-Coupling to CML Driver
Micrel, Inc.
SY88022L
October 2009 8 M9999-102809-A
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Functional Diagram
Functional Description
As shown on the block diagram above, the driver is
composed from an input equalizer, and a modulation
block consisting of a pre-driver, and a current source.
Equalizer
The input equalizer allows for compensation of up to 9”
of FR4 microstrip trace or equivalent. The equalization
restores the losses in high f requency compone nts of the
signal caused by its travel on the line card traces and
through the connectors between the line card and the
module
before it reaches the input stage. The amount of
equalization is programmable with a resistor from pin 7
to ground.
Modulator
The modulator consists of a pre-driver and a current
source. The m odulat ion current is s et in the pr e-dri ver b y
applying a voltage within the range 0V to 1.2V to pin 5
(MODSET). The pre-driver provides the current to the
output stage, which consists of a current source
composed from a differential pair which collectors are
connected to MOD+/MOD- pins and have 50Ω internal
termination to VCC. The Modulation gain curve on page
6 shows modulation current variation versus the applied
voltage at MODSET pin.
Bias
The bias is set b y appl ying a volta ge with in the r ange 0V
to 1.2V to pin 16 (BIASSET). The bias gain curve on
page 6 shows bias current variation versus the applied
voltage at pin 16.
The S Y8802 2L dri ver is de s igned to work with one of the
Micrel’s MIC300X series of controllers which have built
in APC (Automatic Power Control) circuit and a serial
interface for programming modulation and bias,
temperature compensation tables, setting registers, and
monitoring registers read back. Refer to the
MIC3001/MIC3002/MIC3003 datasheets for more
details. T he appl icat ions se ction bel ow sho ws ho w to s et
up the driver to work correctly with the MIC300X
controller.
Micrel, Inc.
SY88022L
October 2009 10 M9999-102809-A
hbwhelp@micrel.com or (408) 955-1690
Package Information
16-Pin (3mm x 3mm) QFN
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 responsibilit y is assumed by Micrel for its use. Micrel reserves the right t o change
circuitry and specific at i ons at any time without notific ation 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 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 Purcha
ser agrees to fully
indemnify Micrel f or any damages resulting from such use or sale.
© 2009 Micrel, Incorporated.
