19-3079; Rev 0; 11/03 MAX3941 Evaluation Kit The MAX3941 evaluation kit (EV kit) is an assembled demonstration board that provides electrical evaluation of the MAX3941 10.7Gbps EAM driver. The output is interfaced to an SMA connector that can be connected to a 50Ω 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 _____________________ Component List DESIGNATION QTY _________________Ordering Information J1−J4, J7 5 J5, J8, J9 JP1, JP3, JP5 JP2, JP4, JP6, JP7 L1 L2 3 3 DESCRIPTION 22µF ±10% tantalum capacitor AVX TAJB226K010 10µF ±10% tantalum capacitor AVX TAJA106K010 0.1µF ±10% ceramic capacitor (0402) Murata 100pF ±5% ceramic capacitors (0201) Murata 0.01µF ±10% ceramic capacitors (0402) SMA connectors, edge mount, EF Johnson 142-0701-851 SMB connectors, PC mount 3-pin headers, 0.1in centers 4 2-pin headers, 0.1in centers 1 1 R1, R3, R5 3 R2, R9 R4 R6 TP1−TP4, TP13, TP14, TP15, J10, J11 U1 2 1 1 47nH inductor (0402) 3.3nH inductor (0201) 2kΩ variable resistors Bourns 3296W-202 1kΩ ±5% resistors (0402) 4.02kΩ ±1% resistor (0402) 2kΩ ±1% resistor (0402) 9 Test points • Signal-source, 10Gbps minimum capability • Oscilloscope with at least 15GHz performance 1 None 1 None None None 1 1 7 MAX3941ETG MAX3941 EV kit circuit board, rev A MAX3941 EV kit data sheet MAX3941 data sheet Shunts 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 combination bias and modulation output (OUT) is also DCcoupled to the SMA connector and requires a 50Ω to ground load for proper operation. C1 1 C2 1 C3 1 C6, C12, C13, C15, C20 C8, C11, C16, C17, C18, C42 5 6 PART MAX3941EVKIT TEMP RANGE -40°C to +85°C IC PACKAGE 24 THIN QFN ________________ Component Suppliers PHONE FAX AVX SUPPLIER 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 MAX3941 when ordering from these suppliers. _________________ Detailed Description The MAX3941 EV kit is a fully assembled and factory tested demonstration board that enables testing of all MAX3941 functions. Test Equipment Required • -5.2V power supply with 300mA current capability Test Equipment Interface __________________________________________________________________Maxim Integrated Products 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. 1 Evaluates: MAX3941 _________________General Description Evaluates: MAX3941 MAX3941 Evaluation Kit _____________________________________________________________________ Quick Start 1) If the data is to be latched, place shunt on JP7 (RTEN) to enable the clock inputs. Otherwise, leave it open. 2) Install a jumper on JP2. 9) Connect a high-bandwidth oscilloscope, such as the Tektronix CSA8000 with the 80E01 sampling head, to J7 (OUT). 4) Install a jumper on the left side of JP5. This allows adjustment of BIASSET. 10) A high-quality SMA attenuator (14dB or 20dB) is required to reduce the signal level for compatibility with the most sampling heads. The attenuator should be connected directly to the output SMA connector on the EV kit to minimize transmission line reflections. 5) 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. 11) Attach a -5.2V power supply to J10 (GND) and J11 (VEE). Set the current limit to 300mA and power up the board. 6) Ensure that a jumper is not installed on JP6 (MODEN) and enable modulation. 12) Adjust R3 until the desired modulation swing is achieved. 7) Connect a differential signal source to J1 (DATA+) and J2 (DATA-). Refer to the MAX3941 data sheet to determine voltage levels. 13) Adjust R5 until the desired bias voltage is achieved. 8) If the latch is enabled, apply a differential clock signal to J3 (CLK+) and J4 (CLK-). Refer to the MAX3941 data sheet to determine voltage levels. 15) If desired, place a shunt on JP4 (PLRT) to invert the output data polarity. 3) Install a jumper on the right side of JP3. This allows adjustment of MODSET using R3. 14) Adjust R1 until the desired pulse width is achieved (if PWC is enabled, see step 5). _______________________________________ 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 MAX3941. Place a jumper on the left-hand side of this jumper to connect the MODSET pin to the SMB connector for AC testing. JP4 PLRT JP5 BIASSET JP6 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. JP7 RTEN Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for direct data transmission. 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). R5 RBIASSET Adjusts the EAM bias current. Turn the potentiometer screw clockwise to increase bias current (decrease the resistance from BIASSET to GND). 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. Place a jumper on the left-hand side of this jumper to connect the RBIASSET potentiometer to the MAX3941. Place a jumper on the right-hand side of this jumper to connect the BIASSET pin to the SMB connector for AC testing. 2 __________________________________________________________________________________________________ MAX3941 Evaluation Kit Evaluates: MAX3941 Figure 1. MAX3941 EV Kit Schematic ________________________________________________________________________________________________ 3 Evaluates: MAX3941 MAX3941 Evaluation Kit Figure 3. MAX3941 EV Kit Component Placement Guide—Component Side Figure 4. MAX3941 EV Kit PC Board Layout—Ground Plane 4 __________________________________________________________________________________________________ MAX3941 Evaluation Kit Evaluates: MAX3941 Figure 5. MAX3941 EV Kit PC Board Layout—Component Side Figure 6. MAX3941 EV Kit PC Board Layout—Power Plane ________________________________________________________________________________________________ 5 Evaluates: MAX3940 MAX3940 Evaluation Kit Figure 7. MAX3941 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 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.