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19-2643; Rev 0; 10/02
MAX3934 Evaluation Kit
General Description
The MAX3934 evaluation kit (EV kit) is an assembled demonstration board that provides electrical evaluation of the MAX3934 10.7Gbps compact laser driver. The die version mounted on the board is the MAX3934A, which contains a 12 internal damping resistor (RD). The output of the evaluation board is interfaced to an SMA connector that can be connected to a 50 terminated oscilloscope. o Fully Assembled and Tested o On-Board Op Amps for Bias and Modulation Current Control o Fully Matched for Best Input Return Loss o Calibration Trace
Features
Evaluates: MAX3934
Component Suppliers
SUPPLIER AVX Coilcraft Digi-Key EFJohnson PHONE 843-444-2863 847-639-6400 218-681-6674 402-474-4800 FAX 843-626-3123 847-639-1469 218-681-3380 402-474-4858 PART MAX3934EVKIT
Ordering Information
TEMP RANGE -40C to +85C IC PACKAGE Chip on board
Murata 415-964-6321 415-964-8165 Note: Please indicate that you are using the MAX3934 when contacting these component suppliers.
Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 150pF chip MIS capacitors Metelics Corporation, 35 mils x 35 mils MC2-S-150-35-35 0.01F 15% ceramic capacitors (0201) 56pF 15% ceramic capacitors (0201) 10F 10% tantalum capacitor (0805) AVX TAJA106K010 0.1F 15% ceramic capacitor (0603) 33F 10% tantalum capacitor SMA connectors, edge mount EFJohnson 142-0701-851 Test points Digi-Key 5000K-ND 2-pin header, 0.1in centers Digi-Key S1012-36-ND Shunt Digi-Key S9000-ND 56nH inductor EMI ferrite bead Murata BLM18HA601SG None None 1 1 DESIGNATION QTY R1, R2, R12, R13 R3 R4 12 2 1 1 1 5 2 1 1 1 1 R5 R6 R11 TP5-TP10, TP12 U1 U2, U3 U4 VR1, VR2 VR3, VR4 None None 4 1 1 1 1 1 7 1 2 1 2 2 1 1 DESCRIPTION 39 5% resistors (0201) 10k 1% resistor (0402) 11.8k 1% resistor (0402) 20k 1% resistor (0402) 4.99k 1% resistor (0402) Not installed Test points Digi-Key 5000K-ND MAX3934AE/D die MAX480ESA, 8-pin SO MAX6190AESA,8-pin SO 200k variable resistors Bourns 3296W-204 100k variable resistors Bourns 3296W-104 Epoxy, conductive, for U1, C1, C2 Ablefilm 84-1 LMI MAX3934 evaluation circuit board, rev A MAX3934 EV kit data sheet MAX3934 data sheet
C3-C9, C13, C14, C18, C19, C20 C10, C15 C11 C12 C32 J1, J2, J3, J6, J7 J4, J5 JU1 JU1 L1 L2
________________________________________________________________ Maxim Integrated Products
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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.
MAX3934 Evaluation Kit Evaluates: MAX3934
Quick Start
1) Remove shunt from JU1 to maintain data polarity. 2) Adjust VR1 and VR2 to their full clockwise positions. A light clicking noise indicates the end of the adjustment range. 3) Apply a differential input signal (amplitude 800mVP-P single ended) to J2 and J3 (IN+ and IN-). 4) Attach a high-speed oscilloscope with 50 inputs to J1. For optimum performance, see the interconnect recommendations that follow. 5) Connect a -5V supply to J4 (VEE) and ground to J5 (VCC). 6) Adjust VR1 counterclockwise until the desired bias current is achieved: IBIAS = (VBIASMON - VEE) / RBIAS where VBIASMON is the measured voltage at TP7 and RBIAS is 6. 7) Adjust VR2 counterclockwise until the desired modulation current is achieved. IMOD = (VMODMON - VEE) / RMOD where VMODMON is the measured voltage at TP8 and RMOD is 3.
Recommendations for Interconnect Between the MAX3934 EV Kit and an Oscilloscope
1) For optimum performance, use a high-bandwidth sampling oscilloscope, such as the Tektronix CSA8000 mainframe with an 80E01 50GHz sampling head. If a 50GHz sampling head is not available, use a 20GHz sampling head, such as the Tektronix 80E03 or 80E04. 2) A high-quality SMA attenuator (6dB or 14dB) is required to reduce the signal level for compatibility with the sampling head. Connect the attenuator directly to the output SMA connector on the EV kit to minimize transmission-line reflections. 3) The total path length from the EV kit to the oscilloscope must to be minimized. If possible, connect the female connector of the attenuator to the female input of the oscilloscope with an SMA adapter. If cables must be used, a 0.141in semirigid 50 coaxial cable with high-quality SMA connectors is recommended (for example, the Tektronix 0151015-00). 4) The output of the EV kit can be AC- or DC-coupled to the oscilloscope. If AC-coupling is preferred, use a DC block rated for high-bandwidth signals and connect it between the output attenuator and the oscilloscope. If the board is DC-coupled to the oscilloscope, use low bias currents so the output voltage does not exceed the maximum voltage of the sampling head.
Adjustments and Control Descriptions
COMPONENT JU1 VR1 VR2 VR3 VR4 NAME POLARITY SWITCH BIAS ADJUST MOD ADJUST BIAS OP-AMP NULL MOD OP-AMP NULL FUNCTION Enables/disables the polarity switch. Remove shunt to maintain data polarity. Shunt to invert data polarity. Adjusts the bias current. Adjusts the modulation current. Adjustment to null the operational amplifier input offset. Adjustment to null the operational amplifier input offset.
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MAX3934 Evaluation Kit Evaluates: MAX3934
C9 0.01F J5 VR3 + 3 C13 0.01F TP7 VEE VEE 2 VEE 6 VREF VEE VEE VEE VEE VEE VEE C7 0.01F C5 0.01F C1 150pF C3 0.01F C18 0.01F 2 1 U3 7 56 4 VEE TP5 GND J4 -5V C15 56pF J6 C32 33F L1 56nH VEE J7 C11 10F C12 0.1F
MAX480
VREF R3 10k VR1 R5 20k TP9
IN
U4 MAX6190
GND 4
OUT
VEE
VEE
VEE
VEE
BIASMON
BIASSET
VEE
L2 BIAS VCC OUT1VEE R12 39 R1 39 J1 OUT2+ OUT2VCC R13 39 R2 39 OUT R11 OPEN
VCC VEE VCC J2 IN+ N.C. X J3 ININ+
U1
OUT1+
MAX3934A
VCC INVCC MODMON PLRT TP12 JU1 C6 0.01F VEE C8 0.01F VEE VEE VEE C4 0.01F C2 150pF MODSET
VCC VEE VEE VEE VEE
VEE
C19 0.01F
C20 0.01F
VREF R4 11.8k VR2 R6 4.99k C14 0.01F TP8 VEE VEE VEE TP10 + 3 2 VR4 1 U2 7 56 4
VEE TP6
C10 56pF VEE
MAX480
Figure 1. MAX3934 EV Kit Schematic _______________________________________________________________________________________ 3
MAX3934 Evaluation Kit Evaluates: MAX3934
Figure 2. MAX3934 EV Kit Component Placement Guide--Component Side
Figure 3. MAX3934 EV Kit PC Board Layout--Component Side
Figure 4. MAX3934 EV Kit PC Board Layout--Ground Plane 4 _______________________________________________________________________________________
MAX3934 Evaluation Kit Evaluates: MAX3934
Figure 5. MAX3934 EV Kit PC Board Layout--Power Plane
Figure 6. MAX3934 EV Kit PC Board Layout--Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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