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SY88992L Evaluation Board
3.3V, 3.2Gbps VCSEL 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
November 2005
M9999-111005-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88992L evaluation board is designed for fast
evaluation of the SY88992L VCSEL driver.
A picture of the board loaded with SY88992L is shown
below.
Data sheets and support documentation can be found
on Micrel’s web site at: www.micrel.com.
Features
• Single 3.3V supply voltage
•
AC-coupled inputs
•
AC-coupled outputs
• Peaking current programming
• Peaking current duration programming
Related Support Documentation
• SY88992L, 3.3V, 3.2Gbps VCSEL Driver data sheet
• SFP_992_R0 (small form-factor pluggable optical
module)
____________________________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY88992L Evaluation Board
November 2005
2 M9999-111005-
A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description and
Setting
The evaluation board consists of a four-layer FR4
board. The inputs of the driver are AC-coupled and
are accessible through SMA connectors.
Board Setting and Operation
1. Use connectors, J1 and J3, to connect a signal to
the driver’s inputs. The driver’s outputs, J2 and
J4, are to be connected to the scope.
2. Connect the power supply between TP1 (V
CC
=
3.3V) and TP5 (GND).
3. Set position 1 of the DIP switch S1 to “ON” to
enable the driver.
4. Adjust the modulation current with potentiometer
R11. The modulation current can be measured
using one of the following methods:
a. Measure the output swing on the scope
and divide it by the load (R1// 50Ω or R2
// 50Ω). The board comes with a 30Ω
load (75Ω // 50Ω).
b. Measure the IM_SET voltage by
connecting a voltmeter between TP4 and
GND, and use the modulation gain curve
to deduce I
MOD.
Figure 1. Modulation Gain vs. IM_SET
Once the modulation current is set, one can use the
peaking option to improve the VCSEL edge response
by varying the peaking amplitude and duration. Use
R3 to adjust the peaking duration. Peaking amplitude
is adjusted by setting different combinations of switch
positions on the DIP switch S1, as shown in table 1
below:
IP/I
MOD
0
%
5
%
10
%
15
%
20
%
25
%
30
%
35
%
Position 2 off on off on off on off on
Position 3 off off on on off off on on
Position 4 off off off off on on on on
Table 1. Peaking/Modulation Current Ratio Setting
OFF Modulation Current Measurement
Set position 1 of the DIP switch S1 to “OFF” to disable
the driver and measure the current using the same
methods as described in step 4 of the “Board Setting
and Operation” section.
Micrel, Inc. SY88992L Evaluation Board
November 2005
3 M9999-111005-
A
hbwhelp@micrel.com or (408) 955-1690
Electrical Eye Diagrams Change with
Peaking and Duration
The following waveforms show how the output of the
driver changes with peaking-to-modulation current
ratio and peaking duration. In real applications where
the driver drives a VCSEL, the appropriate peaking-to-
modulation current ratio and peaking duration are to
be determined experimentally for each family of
VCSELs. All waveforms are captured at 2.125Gbps,
I
MOD
= 15mA.
Increasing Peaking Duration
Increasing Peaking Percentage

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: SY88992L

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