Microchip SY88422L Handleiding

Microchip Niet gecategoriseerd SY88422L

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SY88422L
Optical Evaluation Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2008
M9999-022108-
A
hbwhelp@micrel.com or (408) 955-1690
General Description
This optical evaluation board allows for evaluating the
performance of the SY88422L while driving a laser.
Since the part is designed to work with Micrel’s MIC300x
controller, which has an integrated APC loop, an
external APC loop is implemented to allow the chip to
drive the laser in close loop.
Datasheets and support documentation can be found on
Micrel's web site at: www.micrel.com.
Features
• Open loop or close loop operation
• Manual modulation and bias setting
Related Support Documentation
• SY88422L Datasheet
_________________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY88422L Optical Evaluation Board
February 2008 2 M9999-022108-
A
hbwhelp@micrel.com or (408) 955-1690
TOSA Installation
Check the pin-out of the laser and install according to
the diagrams as shown on Figure 1.
Figure 1. Mounting of the Laser
Board Setting (Open Loop Operation)
1. Install a jumper on SW1 to enable the
SY88422L.
2. Install a jumper between pin 2 and pin 3 of SW3
and remove jumper from SW2 to operate the
circuit in open loop.
3. Before powering the board, adjust
potentiometers VR1 (MODSET) and VR2
(BIASSET) completely counterclockwise to set
bias and modulation currents to zero "0".
4. Connect 3.3V to TP6 (red) and GND to TP5
(black) to power the board.
5. Connect the laser output to the optical module
of the scope with a SMF jumper.
6. Turn VR2 clockwise to increase the bias current
until the laser starts to emit light then turn VR1
clockwise to adjust modulation current.
Continue to tweak bias and modulation current
until an acceptable eye diagram is seen on the
scope.
Close Loop Operation
Since the SY88422 has integrated bias only and no
APC (designed to be used with MIC300x controller),
and external APC loop was built.
1. Turn VR3 completely clockwise to minimize the
bias current when closing the loop.
2. Move the jumper from pins 2 and 3 of SW3 to
pins 1 and 2.
3. Install a jumper on SW2 (FB)
4. Turn VR3 counterclockwise until the light starts
to come out of the laser then adjust MODSET
(VR1) and BIASSET (VR2) to have an
acceptable eye diagram.
Performance
Figure 2. Optical Eye Diagram at 4.25Gbps
Laser Response Tuning
Overshoot/Undershoot
The damping resistors R6 and R7 installed in series
with laser are 10Ω. This value might be changed to a
higher value to minimize or suppress any overshoot or
undershoot on the optical signal out of the laser, but
keep in mind that higher value damping resistors will
lead to higher rise/fall time.
The networks composed from (R2, R15, L4) and (R1,
R16, L3) are used to bias the output of the driver and
improve the laser response. The user can change the
values installed to get better performance with his
laser.
Laser's Package Inductance Compensation
A compensation network comprised of C18/R21 can
be used to compensate for the laser package parasitic
inductance. There are no specific values indicated on
the schematic because the values will depend on the
type of package and lead length. Capacitance from a
few pF to 10nF combined with resistance from 50Ω to
200Ω can be used.
Micrel, Inc. SY88422L Optical Evaluation Board
February 2008 3 M9999-022108-
A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Schematics
LM4040:
Install R12, R13 = 0, R15 = 0
Remove R10-R11, R14, R16
LM4041:
Install R10, R11, R14, R15 = 5.1k, R16
Remove R12, R13

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY88422L

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