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| 19-2787; Rev 0; 2/03 MAX3940 Evaluation Kit _________________General Description The MAX3940 evaluation kit (EV kit) is an assembled demonstration board that provides electrical evaluation of the MAX3940 10.7Gbps laser driver. The output of the electrical evaluation section is interfaced to an SMA connector that can be connected to a 50 terminated oscilloscope. _____________________________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 Evaluates: MAX3940 _____________________ Component List DESIGNATION C0, C1, C10, C11 C2, C6 QTY 4 DESCRIPTION 0.01F 10% ceramic capacitors (0402) 30pF chip MIS capacitors Metelics Corporation, 30 mils x 30mils, MC2-S-030-020-020 22F 10% tantalum capacitor AVX TAJB226K010 10F 10% tantalum capacitor AVX TAJA106K010 0.1F 10% ceramic capacitor (0402) Murata GRP155R61A104K SMA connectors, edge mount, EF Johnson 142-0701-851 Test points, Digi-Key 5000K-ND SMB connectors, PC mount 2-pin headers, 0.1in centers Digi-Key S1012-36-ND 3-pin headers, 0.1in centers Digi-Key S1012-36-ND Shunts, Digi-Key S9000-ND 47nH inductor (0402) 2k variable resistors Bourns 3296W-202 4.2k 1% resistor (0402) 2k 1% resistor (0402) Not installed MAX3940E/D die MAX3940 EV kit circuit board, rev A MAX3940 EV kit data sheet MAX3940 data sheet ________________Ordering Information PART MAX3940EVKIT TEMP. RANGE -40C to +85C IC PACKAGE Chip on board 2 _______________ Component Suppliers SUPPLIER AVX Coilcraft Digi-Key EF Johnson Murata PHONE 843-444-2863 847-639-6400 218-681-6674 402-474-4800 415-964-6321 FAX 843-626-3123 847-639-1469 218-681-3380 402-474-4858 415-964-8165 C3 C4 C5 J1-J7 J10, J11, TP1 J12, J13 JU1-JU3, JU5, JU8 JU4, JU6, JU7 JU1- JU8 L0 R0-R2 R3 R4 R5 U1 None None None 1 1 1 7 3 2 5 3 8 1 3 1 1 1 1 1 1 1 Note: Please indicate that you are using the MAX3940 when ordering from these suppliers. ________________ Detailed Description The MAX3940 EV Kit is a fully assembled and factory tested demonstration board that enables testing of all MAX3940 functions. * -5.2V power supply with 300mA current capability * Signal-source, 10Gbps minimum capability * Oscilloscope with at least 15GHz performance Test Equipment Required Test Equipment Interface The data and clock inputs (DATA, CLK) are DC-coupled to the SMA connectors, so be sure to set proper commonmode voltages for these inputs. The combination bias and modulation output (OUT) is also DC-coupled to the SMA connector and requires a 50 to ground load for proper operation. __________________________________________________________________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. MAX3940 Evaluation Kit Evaluates: MAX3940 _____________________________________________________________________ Quick Start 1) If the data is to be latched, place shunt on JU2 (RTEN) to enable the clock inputs. Otherwise, leave JU2 open. 2) Install jumpers on JU5 and JU8. 3) Install a jumper on the left "DC" side of JU6. This allows adjustment of MODSET. 4) Install a jumper on the right "DC" side of JU7. This allows adjustment of BIASSET. 5) To use the pulse-width control (PWC) install a jumper on the right side of JU4. To disable PWC place a jumper on the left "GND" side of JU4. 6) Ensure that a jumper is not installed on JU3 to float MODEN and enable modulation. 7) Adjust R1 to the full counter-clockwise position. This will minimize modulation swing. 8) Adjust R2 to the full clockwise position. minimize bias voltage. This will 10) Connect a differential signal source to J2 (DATA+) and J3 (DATA-). Refer to the MAX3940 data sheet to determine voltage levels. 11) If the latch is enabled, apply a differential clock signal to J4 (CLK+) and J5 (CLK-). Refer to the MAX3940 data sheet to determine voltage levels. 12) Connect a high-bandwidth oscilloscope such as the Tektronix CSA8000 with the 80E01 sampling head to J1 (OUT). 13) A high-quality SMA attenuator (14dB or 20dB) is required to reduce the signal level for compatibility with the sampling head. The attenuator should be connected directly to the output SMA connector on the EV kit to minimize transmission line reflections. 14) Attach a -5.2V power supply to VEE and GND. Set the current limit to 300mA and power up the board. 15) Adjust R1 clockwise until the desired modulation swing is achieved. 16) Adjust R2 counter-clockwise until the desired bias voltage is achieved. 17) Adjust R0 until the desired pulse width is achieved (if PWC is enabled). 9) Adjust R0 to the approximate center of its adjustment range (if PWC is enabled). _______________________________________ Adjustments and Control Descriptions COMPONENT JU1 JU2 JU3 R1 R2 R0 NAME PLRT RTEN MODEN RMODSET RBIASSET RPWC FUNCTION Enables/disables the polarity inversion function. Shunt JU1 to invert the polarity of the output data. Shunting JU1 shorts the PLRT pin to VEE. Leave open for normal operation. Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for direct data transmission. 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. Adjusts the EAM modulation current. Turn the potentiometer screw clockwise to increase the modulation amplitude (decrease the resistance of MODSET to GND). Adjusts the EAM bias current. Turn the potentiometer screw counter-clockwise to increase bias current (decrease the resistance from BIASSET to GND). Adjusts the EAM pulse width. Turn the potentiometer screw clockwise to increase the logic 1 width. 2 __________________________________________________________________________________________________ MAX3940 Evaluation Kit Evaluates: MAX3940 Figure 1. MAX3940 EV Kit Schematic _________________________________________________________________________________________________ 3 MAX3940 Evaluation Kit Evaluates: MAX3940 Figure 2. MAX3940 EV Kit Component Placement Guide--Component Side Figure 3. MAX3940 EV Kit PC Board Layout--Ground Plane 4 __________________________________________________________________________________________________ MAX3940 Evaluation Kit Evaluates: MAX3940 Figure 4. MAX3940 EV Kit PC Board Layout--Component Side Figure 5. MAX3872/MAX3874 EV Kit PC Board Layout--Power Plane _________________________________________________________________________________________________ 5 MAX3940 Evaluation Kit Evaluates: MAX3940 Figure 6. MAX3872/MAX3874 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. 6 ______________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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