MAX3946EVKIT+ Maxim Integrated, MAX3946EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX3946EVKIT+
• Description: Laser Drivers 1.0625Gbps to 11.3Gbps SFP+ Laser Driver with Laser Impedance Mismatch Tolerance
• Manufacturer: Maxim Integrated
• Type: Laser Driverr

Specifications of MAX3946EVKIT+

• Data Rate: 11.3 Gbps
• Operating Supply Voltage: 2.85 V to 3.63 V
• Supply Current: 68 mA
• Maximum Power Dissipation: 2.2 W

MAX3946 Evaluation Kit
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and
underlined refers to items from the Windows
system.
1)
2)
3)
4)
5)
6)
Windows is a registered trademark of Microsoft Corp.
2
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Solder a laser to connection U6. See Figure 1 for
more information about the laser connection.
Set SW1 to the desired power-supply option (USB
or external supply).
If an external power supply is used, set the voltage
to 3.3V, the current limit to 300mA, and connect the
supply to the board.
To download the latest version of the EV kit software
(MAX3946Rev1.ZIP), visit the Maxim website at
www.maxim-ic.com/evkitsoftware. Unzip the file
to a local folder and run the installation file (setup.
EXE). Installation requires administrative rights and
can also require Internet access to download nec-
essary drivers.
After installation is complete, follow this path
to start the program: Start→All Programs→
MAX3946EVGUI→MAX3946EVGUI.
Connect the computer to the EV kit with a USB cable
(A-male to Mini-B-male). LED D6 should illuminate,
indicating that USB power is detected. Click the USB
Connect button in the software to initiate communica-
tion to the EV kit. The Status indicator turns green
when communication is established.
Quick Start
M
operating
7)
8)
9)
10) The registers contain a default setting and can be
11) To enable the part, the DISABLE checkbox should
12) The Tx De-emphasis Control edit box can be used
Figure 1. TOSA Connection
Connect a 50I source to TIN- and TIN+ (J1 and J2).
Set the source differential amplitude to 500mV
Connect the output from the TOSA to an optical
receiver (optical-to-electrical converter or optical
input head on an oscilloscope).
All device controls are available in the software.
Fault and warning indicators are displayed on the
right side of the graphical user interface (GUI)
window. When a hard fault has occurred the device
goes into latched shutdown. The source of the fault
should be removed and the DISABLE checkbox
should be toggled to reset the part.
read using the Tx Read All button. For detailed reg-
ister functions, refer to the MAX3946 IC data sheet.
be toggled (checked and then unchecked) and the
Tx Enable checkbox should be checked. After doing
this, click the Tx Read All button twice and verify
whether any faults are indicated. All fault indicators
should be green if everything is set up properly.
to adjust the eye diagram. After choosing a new
setting, click the Tx De-emphasis Control edit box
Load button followed by the IMod edit box Load
button. Doing so loads the new preemphasis setting
to the modulation current driver. Further improve-
ments to the eye diagram can be accomplished by
adjusting the component values of L2, L3, L11, L12,
and R5–R8.
U6
1
P-P
.