__________________________________________________________________Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Evaluates: MAX3942
MAX3942 Evaluation Kit
_________________General Description
The MAX3942 evaluation kit (EV kit) is an assembled
demonstration board that provides electrical evaluation of
the MAX3942 10.7Gbps modulator driver. The outputs are
interfaced to SMA connectors that can be connected to a
50Ω terminated oscilloscope.
_____________________ Component List
DESIGNATION QTY DESCRIPTION
C1 1 22µF ±10% tantalum capacitor
AVX TAJB226K010
C2 1 10µF ±10% tantalum capacitor
AVX TAJA106K010
C3 1 0.1µF ±10% ceramic capacitor
(0402)
C10, C25, C26,
C27, C28, C33 6100pF ±5% ceramic capacitors
(0201)
C22, C24, C29,
C31, C42 50.01µF ±10% ceramic capacitors
(0402)
J5, J9 2 SMB connectors, PC mount
J6, J16,
J31−J34 6SMA connectors, edge mount,
EF Johnson 142-0701-851
JP1, JP3 2 3-pin headers, 0.1in centers
JP2, JP8,
JP9, JP10 4 2-pin headers, 0.1in centers
L1 1 47nH inductor (0402)
R1, R3 2 2kΩ variable resistors
Bourns 3296W-202
R2 1 1kΩ ±5% resistor (0402)
R4 1 4.02kΩ ±1% resistor (0402)
TP4, TP8, TP9,
TP12, TP13,
TP15, J10, J11
8 Test points
U4 1 MAX3942ETG
None 1 MAX3942 EV kit circuit board,
rev A
None 1 MAX3942 EV kit data sheet
None 1 MAX3942 data sheet
None 7 Shunts
_____________________________Features
♦ SMA Connectors for All High-Speed I/Os
♦ Configured for Electrical Operation, No Laser
Necessary
♦ Single -5.2V Power-Supply Operation
♦ Fully Assembled and Tested
_________________Ordering Information
PART TEMP RANGE IC PACKAGE
MAX3942EVKIT -40°C to +85°C 24 THIN QFN
________________ Component Suppliers
SUPPLIER PHONE FAX
AVX 843-444-2863 843-626-3123
EF Johnson 402-474-4800 402-474-4858
Murata 415-964-6321 415-964-8165
Note: Please indicate that you are using the MAX3942 when
ordering from these suppliers.
_________________ Detailed Description
The MAX3942 EV kit is a fully assembled and factory
tested demonstration board that enables testing of all
MAX3942 functions.
Test Equipment Required
Test Equipment RequiredTest Equipment Required
Test Equipment Required
• -5.2V power supply with 300mA current capability
• Signal-source, 10Gbps minimum capability
• Oscilloscope with at least 15GHz performance
Test Equipment Interface
Test Equipment InterfaceTest Equipment Interface
Test Equipment Interface
Warning: The data and clock inputs (DATA±, CLK±) are
DC-coupled to the SMA connectors, so be sure to set
proper common-mode voltages for these inputs. The
modulation outputs (OUT±) are also DC-coupled to the
SMA connectors and require a 50Ω to ground load for
proper operation.
19-3093; Rev 0; 12/0
3
MAX3942 Evaluation Kit
2 __________________________________________________________________________________________________
Evaluates: MAX394
2
_____________________________________________________________________ Quick Start
1) If the data is to be latched, place shunt on JP8
(RTEN) to enable the clock inputs. Otherwise, leave it
open.
2) Install a jumper on JP2.
3) Install a jumper on the right side of JP3. This allows
adjustment of MODSET using R3.
4) To use the pulse-width control (PWC) install a jumper
on the lower two pins of JP1. To disable PWC place a
jumper on the top two pins of JP1.
5) Ensure that a jumper is not installed on JP9 (MODEN)
and enable modulation.
6) Connect a differential signal source to J34 (DATA+)
and J33 (DATA-). Refer to the MAX3942 data sheet to
determine voltage levels.
7) If the latch is enabled, apply a differential clock signal
to J2 (CLK+) and J31 (CLK-). Refer to the MAX3942
data sheet to determine voltage levels.
8) Connect a high-bandwidth oscilloscope, such as the
Tektronix CSA8000 with 80E01 sampling heads, to
J16 (OUT+) and J6 (OUT-).
9) High-quality SMA attenuators (14dB or 20dB) are
required to reduce the signal level for compatibility
with the most sampling heads. The attenuators should
be connected directly to the output SMA connectors
on the EV kit to minimize transmission line reflections.
10) Attach a -5.2V power supply to J10 (GND) and J11
(VEE). Set the current limit to 300mA and power up
the board.
11) Adjust R3 (MODSET) until the desired modulation
swing is achieved.
12) Adjust R1 (PWC) until the desired pulse width is
achieved (if PWC is enabled, see step 5).
13) If desired, place a shunt on JP10 (PLRT) to invert the
output data polarity.
_______________________________________ Adjustments and Control Descriptions
COMPONENT NAME FUNCTION
JP1 PWC
This jumper enables/disables the pulse-width-control circuitry. Place a shunt on
the top two pins to disable the PWC circuitry. Place a shunt on the bottom two pins
to enable the PWC circuitry.
JP3 MODSET
Place a jumper on the right-hand side of this jumper to connect the RMODSET
potentiometer to the MAX3942. Place a jumper on the left-hand side of this jumper
to connect the MODSET pin to the SMB connector for AC testing.
JP8 RTEN Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for
direct data transmission.
JP9 MODEN
Enables/disables modulation output. Shunt to disable switching of the data output.
When shunted, the output goes to the absorbtive (logic 0) state. Remove shunt to
enable modulation.
JP10 PLRT
Enables/disables the polarity inversion function. Shunt to invert the polarity of the
output data. Shunting this jumper shorts the PLRT pin to VEE. Leave open for
normal operation.
R1 RPWC Adjusts the EAM pulse width. Turn the potentiometer screw counter-clockwise to
increase the logic 1 width.
R3 RMODSET Adjusts the EAM modulation current. Turn the potentiometer screw clockwise to
increase the modulation amplitude (decrease the resistance of MODSET to GND).
MAX3942 Evaluation Kit
________________________________________________________________________________________________ 3
Evaluates: MAX3942
Figure 1. MAX3942 EV Kit Schematic
MAX3942 Evaluation Kit
4 __________________________________________________________________________________________________
Evaluates: MAX394
2
Figure 2. MAX3942 EV Kit Component Placement Guide—Component Side
Figure 3. MAX3942 EV Kit PC Board Layout—Ground Plane
MAX3942 Evaluation Kit
________________________________________________________________________________________________ 5
Evaluates: MAX3942
Figure 4. MAX3942 EV Kit PC Board Layout—Component Side
Figure 5. MAX3942 EV Kit PC Board Layout—Power Plane
MAX3942 Evaluation Kit
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 ______________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX394
2
Figure 6. MAX3942 EV Kit PC Board Layout—Solder Side
