SY88022AL

SY88022AL
11.3Gbps Laser Diode Driver
General Description
Features
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.
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•
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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.
Operates from a single 3.3V supply
Data rate operation up to 11.3125Gbps
Modulation current up to 75mA
Fast edges rates, below 25ps
Bias current up to 80mA
Input equalizer
Small form factor 3mm × 3mm QFN package
Applications
• Multi-rate LAN, MAN applications 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
•
•
•
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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
January 13, 2015
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SY88022AL
Ordering Information
Part Number
SY88022ALMG
(1)
SY88022ALMG TR
Package Type
Operating Range
Package Marking
Lead Finish
3mm × 3mm QFN-16
Industrial
022A with Pb-Free bar line indicator
NiPdAu Pb-Free
3mm × 3mm QFN-16
Industrial
022A with Pb-Free bar line indicator
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 close to VCC pin as
possible.
8, 14,
Exposed Pad
GND
Ground. Ground and exposed pad must be connected to the plane of the most negative
potential.
2
DIN+
Non-inverting input data. Internally terminated with 50Ω.
3
DIN–
Inverting input data. Internally terminated with 50Ω.
5
MODSET
6
/EN
7
EQSET
Install a resistor from this pin to GND to set the desired equalization level. 0Ω will provide
maximum equalization 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.
Internally terminated with 25Ω to VCC.
11
MOD+
Non-inverted modulation current output. Provides modulation current when input data is positive.
Internally terminated with 25Ω to VCC.
13
BIAS
Modulation current setting and control. Apply a voltage within the range 0V - 1.2V to this pin to
set the modulation current. Input impedance 25kΩ.
Active Low TTL. Internal 75kΩ pull down to GND. The driver is enabled when this pin is
unconnected or /EN asserted low and disabled when /EN asserted high.
Bias current output.
15
BIASMON
Bias current monitor. Outputs a current which represents 1/100th of the bias current. 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 - 1.2V to this pin to set the
bias current. Input impedance 25kΩ.
Truth Table
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
Notes:
2. IMOD = 0 when MOD+ = H.
3. Assuming that the laser cathode is tied to MOD+.
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SY88022AL
Absolute Maximum Ratings(4)
Operating Ratings(5)
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
Supply Voltage (VCC) .................................... +3.0V to +3.6V
Ambient Temperature (TA) .......................... –40°C to +85°C
Package Thermal Resistance(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
ICC
Power Supply Current
Modulation and bias currents
excluded
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
VID
Differential Input Voltage Swing
200
VIL
/EN Input Low
VIH
/EN Input High
2
IBIAS
Bias Current
10
IBIAS_OFF
Bias OFF Current
Current at BIAS when the
device is disabled
IBIASMON to IBIAS Ratio
Resistor installed from
BIASMON to GND
Accuracy of IBIASMON to IBIAS ratio
Resistor installed from
BIASMON to GND
IBIASMON /
IBIAS
RMODSET
Input Resistance at MODSET pin
VMODSET
Voltage Range at MODSET Pin
RBIASSET
Input Resistance at BIASSET pin
VBIASSET
Voltage Range at BIASSET pin
Min
Typ
Max
Units
(7)
85(7)
mA
65
50
55
Ω
1000
mVpp
0.8
V
V
80
mA
150
µA
µA/mA
10
-5
+5
kΩ
25
IMOD range 10mA to 60mA
1.2
V
kΩ
25
IBIAS 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 = 30mA, IBIAS
= 30mA.
Symbol
(8)
IMODMAX
Parameter
Condition
Data Rate
NRZ
Maximum Modulation Current
Min
AC-coupled into 25Ω external load
60
AC-coupled into 15Ω external load
75
AC-coupled into 10Ω external load
85
Typ
Max
Units
11.3125
Gbps
mA
IMODMIN(8)
Minimum Modulation Current
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% to 80%, 25Ω load
25
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:
8. IMOD is defined as the current going into the external load.
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SY88022AL
Typical Characteristics(9)
Bias Gain
95
90
94.5
94
93.5
93
92.5
92
Modulation Gain
TOTAL MODULATION CURRENT (mA)
100
BIAS CURRENT (mA)
IBIAS/IBIASMON
IBIAS/IBIASMON vs BIAS
95.5
80
70
60
50
40
30
20
10
0
91.5
3.8
20
36.2
52.4
68.6
BIAS CURRENT (mA)
85.6
100
300
500
700
BIASSET (mV)
900
1100
120
100
80
60
40
20
0
100
300
500
700
900
1100
1300
MODSET (mV)
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.
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SY88022AL
Functional Characteristics
Electrical Eye Diagram at 10.3125Gbps
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SY88022AL
Functional Block Diagram
Input and Output Stages
Figure 1. Simplified Input Stage
January 13, 2015
Figure 2. Simplified Output Stage
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SY88022AL
Functional Description
Bias
The bias is set by applying a voltage within a 0V - 1.2V
range to Pin 16 (BIASSET). The Bias Gain curve on page
6 shows bias current variation versus the applied voltage
at Pin 16.
As shown in the block diagram, the driver is composed of
an input equalizer, a modulation block consisting of a predriver, 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.
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.
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.
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SY88022AL
Application Information
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 Application Schematic
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SY88022AL
Package Information(10)
16-Pin (3mm × 3mm) QFN-16
Note:
10. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
January 13, 2015
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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 timing & 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 layer 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 offices and
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of distributors and reps worldwide.
Micrel makes no representations or warranties with respect to the accuracy 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 to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
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