SY88022AL
11.3Gbps Laser Diode Driver
General Descr i ption
The SY88022AL is a single 3.3V supply, small form-factor,
multi-rate laser driver for telecom/datacom applications
using FP/DFB lasers at data rates up to 11.3125Gbps. The
driver can deliver a modulation current of up to 75mA into
a 15Ω external load with a fast edge rate below 25ps, and
a bias current of up to 80mA. Having an equalizer at the
input will compensate for the SFP+ connector and line
card long traces.
The SY88022AL interfaces with MIC3003, Micrel’s highly
advanced optical module controller, as an easy-to-use
chipset solution for SFP+ optical module applications. The
MIC3003 allows for many features, including modulation
and bias current control, automatic power control, and
temperature compensation using look up tables. The
MIC3003 comes in 4mm × 4mm QFN (MIC3003GML) and
3mm × 3mm QFN (MIC3003GFL) packages.
The SY88022AL operates on a single 3.3V power supply
and comes in a 3mm × 3mm QFN package.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
• Operates from a singl e 3.3V supply
• Data rate operation up to 11.3125Gbps
• Modulation current up t o 75mA
• Fast edges rates, bel ow 25ps
• Bias current up to 80mA
• Input equalizer
• Small form factor 3mm × 3mm QFN package
Applications
• Multi-rate LAN, MAN appli cat i ons up to 11.3Gbps:
8xFC, 10G GbE, SONET OC-192,, and SDH STM-64
• SFP+, XFP, XPAK, XENPAK, X2, MSA 300 optical
modules
• OBSAI, CPRI
Markets
• Fibre channel storage area networks
• Datacom/enterprise
• Telecom
• Wireless base stations
____________________________________________________________________________________
Typical Application Circuit
.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
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SY88022AL
Ordering I nfor m ati on
Part Number
Package Type
Operating Range
Package Marking
Lead Finish
SY88022ALMG 3mm × 3mm QFN-16 Industrial 022A with Pb-Free bar line indic ator NiPdAu Pb-Free
SY88022ALMG TR
(1)
3mm × 3mm QFN-16 Industrial 022A with Pb-Free bar line indic ator NiPdAu Pb-Free
Note:
1. Tape and reel.
Pin Configuration
16-Pin 3mm × 3mm QFN
(Top View)
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SY88022AL
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 c l os e to VCC pin as
possible.
8, 14,
Exposed Pad GND Ground. Grou nd and exposed pad must be connected to the plane of the most negati ve
potential.
2 DIN+ Non-invert ing input dat a. Internally term inated with 50Ω.
3 DIN– Inverting input data. Inter nally terminated with 50Ω.
5 MODSET Modulation current setti ng and control. A pply a voltage within the rang e 0V - 1.2V t o this pin to
set the modulation current. Input impedance 25kΩ.
6 /EN Active Lo w TTL. Internal 75kΩ pull down to GND. The dr iver is enabled when this pin is
unconnected or /EN asserted l ow and disabl ed when /EN asser ted high.
7 EQSET Install a resistor from this pin to GND to set the desired equalization level. 0Ω will provide
maximum equ ali z ation and 2kΩ or higher will provide negligible equalization. Leave ope n i f no
equalization is needed.
10 MOD– Inverted modulation current output. Provides modul ation current when input data is negative.
Internall y terminated with 25Ω to VCC.
11 MOD+ Non-inv erted modulat ion current out put. Provides m odulation current when input data is positive.
Internall y terminated with 25Ω to VCC.
13 BIAS Bias current output.
15 BIASMON Bias current monitor. Outputs a c urrent which represents 1/100th of the bias current. Install an
external resis tor from t his pin to GND to convert the output current to a voltage proporti onal to
the bias current.
16 BIASSET Bias current s etting and control. Apply a volt age within the range 0V - 1.2V to this pin to set t he
bias current. Input impedance 25kΩ.
Truth Table
Notes:
2. IMOD = 0 when MOD+ = H.
3. Assuming that the laser cathode is tied to MOD+.
DIN+
DIN-
/EN
MOD+
(2)
MOD-
Laser Output
(3)
L H L H L L
H L L L H H
X X H H L L
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SY88022AL
Absolute Ma xi mu m Ratings(4)
Supply Voltage (VIN) ..................................... –0.5V to +4.0V
CML Input Voltage (V IN) .................... VCC–1.2V to VCC+0.5V
TTL Control Input V ol tage (VIN) ........................... 0V to VCC
Lead Temperature (soldering, 20sec.) ..................... +260°C
Storage Temperature (Ts) ......................... –65°C to +150°C
Operating Ratings(5)
Supply Voltage (VCC) .................................... +3.0V to +3.6V
Ambient Temperature (TA) .......................... –40°C to +85°C
Package Thermal R esistance(6)
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. 25Ω external load. Typical values are VCC = +3.3V, TA = 25°C,
IMOD = 30mA, IBIAS = 30mA.
Symbol Parameter Condition Min Typ Max Units
ICC Power Supply C urrent Modulation and bias currents
excluded 65(7) 85(7) mA
VMOD_MIN Minimum Voltage Required at the Driv er
Output (headr oom) for Proper Operation 1.2 V
VBIAS_MIN Minimum Voltage Requi red at the BI AS
Output (headr oom) for Proper Operation 1.2 V
RIN Input Resistance, Single Ended 45 50 55 Ω
VID Differential Input Voltage Swing 200 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 BI A S when the
device is disa bled 150 µA
IBIASMON /
IBIAS
IBIASMON to IBIAS Ratio Resistor installed f rom
BIASMON to GND 10 µA/mA
Accuracy of IBIASMON to IBIAS ratio Resistor installed from
BIASMON to GND -5 +5 %
RMODSET Input Resistance at MODSE T pin 25 kΩ
VMODSET Voltage Range at MODSET Pin IMOD range 10mA to 60mA 1.2 V
RBIASSET Input Resista nce at BIASSET pin 25 kΩ
VBIASSET Voltage Range at BIASSET pin IB IAS range 10mA to 80mA 1.2 V
Note:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating rating.
6. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
7. IMOD and IBIAS not included. MOD+/- tied to VCC through inductors. Maximum Icc measured with IMOD = 60 mA, IBIAS = 80 mA, and VCC=3.6V.
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SY88022AL
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 = 30m A , IBIAS
= 30mA.
Symbol Parameter Condition Min Typ Max Units
Data Rate NRZ 11.3125 Gbps
IMODMAX(8)
Maximum Modulation Current
AC-coupled int o 25Ω external load 60
mA
AC-coupled int o 15Ω external load 75
AC-coupled int o 10Ω external load 85
IMODMIN
(8)
Minimum Modulation Cur rent AC-coupled into 25Ω external load 10 mA
IMOD_OFF Modulation OFF Current Current at MOD+ and MOD- when the
device is disabled 150 µA
tr Output Current Rise Time 20% to 80%, 25Ω load 25 ps
tf Output Current Fall Time 20% t o 80%, 25Ω load 25 ps
DJ Deterministic Jitter K25.8 pattern at 11.3Gbps,
VIN = 200mVpp 4 psPP
RJ Random Jitter K25.8 patter n at 11.3Gbps,
VIN = 200mVpp 0.3 psPP
Notes:
8. IMOD is defined as the current going into the external load.
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SY88022AL
Typical Characteristics(9)
Note:
9. The plotted modulation current is the total modulation current which includes the current into the internal 25Ω termination and IMOD into the external
load.
91.5
92
92.5
93
93.5
94
94.5
95
95.5
3.8 20 36.2 52.4 68.6 85.6
IBIAS/IBIASMON
BIAS CURRENT (mA)
IBIAS/IBIASMON vs BIAS
0
10
20
30
40
50
60
70
80
90
100
100 300 500 700 900 1100
BIAS CURRENT (mA)
BIASSET (mV)
Bias Gain
0
20
40
60
80
100
120
100 300 500 700 900 1100 1300
TOTAL MODULATION CURRENT (mA)
MODSET (mV)
Modulation Gain
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SY88022AL
Functional Descript ion
As shown in the block diagram, the driver is composed of
an input equalizer, a modulation block consisting of a pre-
driver, and a current source.
Equalizer
The input equalizer allows for compensation up to 12” of
the FR4 microstrip trace or equivalent. In high frequency
components, the equalization restores the losses of the
signal caused by its travel along 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 modulation current is set in the pre-driver by
applying a voltage within the range 0V - 1.2V to Pin 5
(MODSET). The pre-driver provides a current to the
output stage. This stage consists of a current source
composed from a differential pair in which collectors are
connected to MOD+/MOD– pins and have 25Ω internal
termination to VCC. The modulation gain curve shows
modulation current variation versus the applied voltage at
MODSET pin.
Bias
The bias is set by applying a voltage within a 0V - 1.2V
range to Pin 16 (BIASSET) . The Bi as Gain curve on page
6 shows bias current variation versus the applied voltage
at Pin 16.
The SY88022AL driver is designed to work with one of
the Micrel’s MIC300X series of controllers which have a
built-in Automatic Power Control (APC) circuit and a
serial interface for programming modulation and bias,
temperature compensation tables, setting registers, and
monitoring registers read back. Refer to the Optical
Module Controllers datasheets for more details. The
applications section below shows how to set up the driver
to work correctly with the MIC300X controller.
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SY88022AL
Application Inform ation
The following typical application schematic shows the diagram for a typical 10G optical transceiver using the Micrel’s chip
set comprised from SY88022AL driver, SY88053CL/073L/063CL/083L post amplifier, and FOM management IC
MIC3003.
Typical Applicatio n Schematic
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SY88022AL
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
Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and t
iming & communications
markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-
performance communication, clock
management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical la
yer transceiver ICs. Company
customers include leading
manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products.
Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support office
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n extensive network
of distributors and reps worldwide.
Micrel makes no representations or warranties with respect to the ac
curacy or completeness of the information furnished in this datasheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right t
o change circuitry,
specifications and descriptions at
any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes
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whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including
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can reasonably be expected to result in personal injury.
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