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Download Evaluates: MAX3645 MAX3645 Evaluation Kit _______________ General Description
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19-3074; Rev 0; 11/03 MAX3645 Evaluation Kit ___________________________ Features The MAX3645 evaluation kit (EV kit) simplifies evaluation of the MAX3645 limiting amplifier. The EV kit allows easy programming of the loss-of-signal (LOS) threshold and provides layout options for alternate output terminations. ♦ Easy +2.97V to +5.5V Electrical Evaluation ♦ Fully Assembled and Tested ♦ Easy LOS Threshold Programming ____________________Component List ♦ Designed for 50Ω Ω Test Interfaces DESIGNATION QTY ♦ Allows Alternate Output Terminations C1, C2 2 C3, C4 2 C5–C9, C12, C13 7 C11 1 J1, J2, J5, J6 4 J3, J4, J9 3 JU1 1 JU2–JU4 3 JU1–JU4 4 L1, L2 2 R1, R2 2 R3 1 R4 R5 R6 R8, R9 R13, R15 R19, R21 SB1 TP1–TP3, TP9–TP11 1 1 1 2 2 2 1 U1 1 None 1 Z1, Z2 2 6 DESCRIPTION 33µF ±10% tantalum capacitors AVX TAJB336K010R 3.3µF ±10% ceramic capacitors (0805) 0.1µF ±10% ceramic capacitors Murata GRP155R61A104K 1000pF ±10% ceramic capacitor Murata GRP155R71H102K SMA connectors (edge mount) EF Johnson 142-0701-801 Test points Digi-Key 5000K-ND 2×5-pin header block, 0.1in centers Digi-Key S1012-36-ND 2-pin headers, 0.1in centers Shunts Digi-Key S9000-ND 1.2µH inductors Coilcraft 1008CS-122XJBC 84.5Ω ±1% resistors (0402) 5kΩ variable resistor Digi-Key 3296W-1-502-ND 100Ω ±1% resistor (0402) 1kΩ ±1% resistor (0402) 2kΩ ±1% resistor (0402) 49.9Ω ±1% resistors (0402) 49.9Ω ±1% resistors (0805) Not installed Solder bridge, open Test points Digi-Key 5000K-ND MAX3645ESE 16-pin SOIC (MAX3645ESEEVKIT) MAX3645EEE 16-pin QSOP (MAX3645EEEEVKIT) MAX3645ESE EV kit circuit board, Rev A (MAX3645ESEEVKIT) MAX3645EEE EV kit circuit board, Rev A (MAX3645EEEEVKIT) 0Ω resistors (0402) ______________ Ordering Information PART MAX3645ESEEVKIT MAX3645EEEEVKIT TEMP RANGE -40°C to +85°C -40°C to +85°C IC PACKAGE 16 SOIC 16 QSOP ______________ Component Suppliers SUPPLIER AVX PHONE FAX 843-448-9411 843-626-3123 Coilcraft 847-639-6400 847-639-1469 Digi-Key 800-344-4539 218-681-3380 Murata 770-436-1300 770-436-3030 Note: Please indicate that you are using the MAX3645 when ordering from these suppliers. ________________________ Quick Start 1) Place a shunt on JU3 and remove shunts from JU2 and JU4. 2) Set the threshold resistor (RTH) to 100Ω by placing a shunt at position 4 of JU1. 3) Connect a +2V power supply to J3 (VCC), a –1.3V power supply to J9 (VEE), and the power supply ground to J4 (GND). 4) Apply a 155Mbps differential signal (10mVP-P) between SMA connectors J1 (DIN+) and J2 (DIN-). 5) Connect an oscilloscope with 50Ω terminations to SMA connectors J5 (DOUT-) and J6 (DOUT+). (To avoid overloading the oscilloscope, use 20dB of attenuation between the outputs and the oscilloscope inputs.) 6) Monitor LOS by connecting a voltage meter to TP9. ________________________________________________________________ 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. www.BDTIC.com/maxim Evaluates: MAX3645 _______________ General Description Evaluates: MAX3645 MAX3645 Evaluation Kit ______________ Detailed Description The MAX3645 EV kit is a fully assembled and factory tested demonstration board that enables testing of all MAX3645 functions. Setting the LOS Threshold Resistor Jumper bank JU1 is used to select the value of the threshold resistor (RTH). Position 1 connects to the potentiometer R3 that can be set to any resistance value between 0Ω and 5kΩ. Positions 2–5 provide fixed resistance settings of 2kΩ, 1kΩ, 100Ω, 0Ω respectively. Automatic Squelch Placing a shunt on JU3 enables automatic squelch. This jumper connects the LOS output directly to the DIS input. If the data input signal drops below the LOS assert level the outputs are automatically disabled. When the data input signal returns above the LOS deassert level the outputs are enabled. DC-Offset Correction The DC offset correction is disabled when a shunt is on JU2. For normal operation, leave JU2 open. Data Input Terminations The EV kit has a 100Ω differential input termination. If the input is driven single-ended, terminate both sides of the input with 50Ω to ground by shorting solder bridge SB1. PECL Output Terminations The outputs of the MAX3645 are PECL compatible and any standard DC or AC termination can be used. Figure 1 illustrates typical DC and AC terminations. When the data outputs are AC-coupled a shunt can be put on JU4 to short VEE to ground. Otherwise JU4 should be left open. To avoid overloading the oscilloscope, use 20dB of attenuation between the data outputs and the oscilloscope inputs. 2 _________________________________________________________________________________________ www.BDTIC.com/maxim MAX3645 Evaluation Kit V CC DOUT+ 20dB R21 OPEN DOUT- MAX3645ESE MAX3645EEE V EE Z O = 50 Ω Z2 0Ω 50 Ω 20dB Z O = 50 Ω R19 OPEN LOS LOS OSCILLOSCOPE Z1 0Ω 50 Ω R15 50 Ω R13 50 Ω -0.97V TO -3.5V AC-COUPLED PECL TERMINATION +3.3V OR +5V V CC DOUT+ 20dB R21 DOUT- MAX3645ESE MAX3645EEE Z O = 50 Ω Z2 0.1 µ F 50 Ω 20dB Z O = 50 Ω R19 50 Ω LOS R15 LOS V EE OSCILLOSCOPE Z1 0.1 µ F SUPPLY R13, R15, R19, R21 3.3V 150 Ω 5V 270 Ω R13 0V Figure 1. PECL Output Terminations _________________________________________________________________________________________ 3 www.BDTIC.com/maxim Evaluates: MAX3645 DC-COUPLED PECL TERMINATION (DEFAULT) +2V Evaluates: MAX3645 MAX3645 Evaluation Kit VCC L1 1.2 µ H VCC TP1 J3 GND R2 84.5 Ω C1 33 µ F C3 3.3 µ F C2 33 µ F C4 3.3 µ F R3 5k Ω JU1 TP2 1 J4 VEE L2 1.2 µ H JU4 R6 2k Ω 2 TP3 R5 1k Ω J9 3 R1 84.5 Ω VEE R4 100 Ω 4 1 JU2 C5 0.1 µ F DIN+ SB1 OPEN R8 49.9 Ω R9 49.9 Ω C8 0.1 µ F VEE C9 0.1 µ F DINVCC 5 C11 1nF N.C. CAZ1 15 VCC 3 4 5 C7 VCC 0.1 µ F J2 16 VEE 2 C6 0.1 µ F J1 TH CAZ2 6 7 8 V CCE GNDA DIN+ DIN- U1 MAX3645ESE MAX3645EEE DOUT+ DOUT- GNDE V CCA CSD LOS DIS LOS 14 C12 0.1 µ F 12 10 J6 Z2 0Ω J5 DOUT+ R21 OPEN 13 R19 OPEN C13 0.1 µ F 11 Z1 0Ω TP10 VEE R15 49.9 Ω 9 TP9 JU3 TP11 R13 49.9 Ω Figure 2. MAX3645 EV Kit Schematic 4 _________________________________________________________________________________________ www.BDTIC.com/maxim DOUT- MAX3645 Evaluation Kit Evaluates: MAX3645 Figure 3. MAX3645ESE EV Kit Component Placement Guide— Component Side Figure 4. MAX3645ESE EV Kit PC Board Layout—Component Side Figure 5. MAX3645ESE EV Kit PC Board Layout—Ground Plane Figure 6. MAX3645ESE EV Kit PC Board Layout—Power Plane _________________________________________________________________________________________ 5 www.BDTIC.com/maxim Evaluates: MAX3645 MAX3645 Evaluation Kit Figure 7. MAX3645ESE EV Kit PC Board Layout—Solder Side Figure 8. MAX3645EEE EV Kit Component Placement Guide— Component Side Figure 9. MAX3645EEE EV Kit PC Board Layout— Component Side Figure 10. MAX3645EEE EV Kit PC Board Layout—Ground Plane 6 _________________________________________________________________________________________ www.BDTIC.com/maxim MAX3645 Evaluation Kit Evaluates: MAX3645 Figure11. MAX3645EEE EV Kit PC Board Layout—Power Plane Figure12. MAX3645EEE 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____________________7 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products www.BDTIC.com/maxim
