19-2910; Rev 0; 7/03 MAX3841 Evaluation Kit The MAX3841 DC-coupled evaluation kit (EV kit) simplifies evaluation of the MAX3841 12.5Gbps 2 × 2 CML crosspoint switch. The EV kit enables testing of all the MAX3841 functions. SMA connectors with 50Ω controlled-impedance transmission lines to the MAX3841 are provided for all CML inputs and outputs. The board includes additional transmission lines for calibration purposes. ____________________Component List DESIGNATION C1, C7, C13, C22, C27, C30 C2, C8, C12, C14, C26, C29 C3, C4, C6, C9, C10, C11, C16, C17, C23, C24, C25, C28 C5, C15, C18–C21 J1–J8, J10, J12, J14, J16 JU1, JU3, JU8, JU9 JU2, JU4–JU7 QTY JU1–JU9 9 L1–L6 6 TP5–TP10, J9, J11, J13, J15, J18, J19, J20 U1 None 6 6 12 6 12 DESCRIPTION 33µF ±10% tantalum capacitors (B case) 2.2µF ±10% ceramic capacitors (0805) 0.01µF ±10% ceramic capacitors (0201) 0.1µF ±10% ceramic capacitors (0402) SMA connectors (edge mount, tab contact) 4 3-pin headers, 0.1in centers 5 2-pin headers, 0.1in centers Shunts Digi-Key S9000-ND 56nH inductors Coilcraft 0805CS-560XKBC 13 1 1 Test points Digi-Key 5000K-ND MAX3841ETG 24-pin Thin QFN MAX3841 EV kit circuit board, Rev A ______________ 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 ___________________________ Features ♦ DC-Coupled Evaluation Kit ♦ Independent Power-Supply Connections ♦ Fully Assembled and Tested ♦ SMA Connectors for CML Inputs and Outputs ♦ Additional Transmission Lines for Calibration ______________ Ordering Information PART MAX3841EVKIT TEMP RANGE -40°C to +85°C IC PACKAGE 24 Thin QFN ________________________ Quick Start Caution: The MAX3841 EV kit is a DC-coupled evaluation board. Each CML input and output is terminated with 50Ω to the respective I/O supplies. DCcoupled operation with positive I/O supplies may cause permanent damage to laboratory test equipment (oscilloscope, BERT). The I/O supplies must be connected to ground and a negative supply connected to VEE when DC-coupling to laboratory test equipment. 1) Connect the I/O supplies to ground and disconnect VEE from ground by placing shunts on JU2, JU4, JU5, JU6, and removing the shunt from JU7. 2) Enable both outputs by placing shunts across pins 1 and 2 of JU8 and JU9. 3) Configure the crosspoint switch to route IN1 to both OUT1 and OUT2 by placing shunts across pins 2 and 3 of JU1 and across pins 1 and 2 of JU3. 4) Connect a +1.5V power supply to J13 (VCC). Connect the power-supply ground to J19 (GND). Connect a -1.8V power supply to J20 (VEE). 5) Apply a 10Gbps differential signal (150mVP-P to 1200mVP-P) to SMA connectors J1 (IN1+) and J2 (IN1-). 6) Connect an oscilloscope with 50Ω terminations to SMA connectors J5 (OUT1-), J6 (OUT1+), J7 (OUT2+), and J8 (OUT2-). Note: Please indicate that you are using the MAX3841 when ordering from these suppliers. ________________________________________________________________ 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: MAX3841 _______________ General Description Evaluates: MAX3841 MAX3841 Evaluation Kit _____________ Supply Configurations ___________________ Output Controls DC-Coupling to Lab Equipment Each of the LVCMOS control inputs (ENO1, ENO2, SEL1, SEL2) can be set high or low using the on-board 3-pin headers (JU1, JU3, JU8, JU9). Placing a shunt across pins 1 and 2 forces a control input low (VEE), and placing a shunt across pins 2 and 3 forces a control input high (VCC). See Table 1 for the setting options. Place shunts on JU2, JU4, JU5, and JU6 to connect the I/O supplies to ground. Remove the shunt from JU7 to disconnect VEE from GND. Connect a +1.5V supply to VCC (J13), supply ground to GND (J19), and a -1.8V supply to VEE (J20). This supply configuration puts 3.3V on the core supply and 1.8V on all the I/O supplies. All the I/O supplies must have the same voltage when DC-coupled to lab equipment. Adjustment to the core and I/O supplies is done in two steps. First, adjust VEE until the desired I/O supply voltage is achieved. Second, adjust VCC until the desired core supply voltage is achieved. Adjustments to VEE change both the I/O and core supplies, but adjustments to VCC only change the core supply. For example, to have a core supply voltage of 3.3V and an I/O supply voltage of 2.5V, adjust VEE to -2.5V and VCC to +0.8V. AC-Coupling Connect external AC-coupling capacitors to IN1± (J1, J2), IN2± (J3, J4), OUT1± (J5, J6), and OUT2± (J7, J8). Remove the shunts from JU2, JU4, JU5, and JU6 to disconnect the I/O supplies from one another and ground. Place a shunt on JU7 to connect VEE to ground. Connect a +3.3V supply to VCC (J13) and supply ground to GND (J19). Connect any voltage between +1.71V and VCC to VCC1IN (J9), VCC2IN (J18), VCC1OUT (J11), and VCC2OUT (J15). Table 1. Output Controls ENO1 ENO2 SEL1 SEL2 OUT1 OUT2 0 0 0 0 IN2 IN1 0 0 0 1 IN2 IN2 0 0 1 0 IN1 IN1 0 0 1 1 IN1 IN2 0 1 0 X IN2 Disabled 0 1 1 X IN1 Disabled 1 0 X 0 Disabled IN1 1 0 X 1 Disabled IN2 1 1 X X Disabled Disabled 0 = Pins 1 and 2 shunted. 1 = Pins 2 and 3 shunted. X = Don’t care. When the inputs and outputs are AC-coupled, each of the I/O supplies (VCC1IN, VCC2IN, VCC1OUT, VCC2OUT) are independent and do not need to be connected to the same voltage. The core supply is independent of the I/O supplies, but it must have a voltage between 3.0V and 3.6V for proper operation. DC-Coupling Chip-to-Chip Remove the shunts from JU2, JU4, JU5, and JU6 to disconnect the I/O supplies from one another and ground. Place a shunt on JU7 to connect VEE to ground. Connect a +3.3V supply to VCC (J13) and supply ground to GND (J19). Connect the input supplies (VCC1IN, VCC2IN) to the output termination voltages of the previous chip(s) (transmitters). Connect the output supplies (VCC1OUT, VCC2OUT) to the input termination voltages of the following chip(s) (receivers). Verify all the supplies have a common ground. Each of the I/O supplies can be at different voltages between +1.71V and VCC. 2 _________________________________________________________________________________________ MAX3841 Evaluation Kit TP10 J20 GND C30 33 µ F C29 2.2 µ F JU7 C15 0.1 µ F C23 0.01 µ F L3 56nH VCC VEE VCC TP9 J13 C28 0.01 µ F C13 33 µ F C18 0.1 µ F C14 2.2 µ F C16 0.01 µ F C17 0.01 µ F J19 VEE L4 56nH VCC2OUT TP6 VCC2OUT L2 56nH VCC1OUT J15 TP5 VCC1OUT J11 C27 33 µ F C26 2.2 µ F C21 0.1 µ F C24 0.01 µ F C25 0.01 µ F C7 33 µ F VEE L1 56nH VCC1IN TP7 C8 2.2 µ F C20 0.1 µ F C9 0.01 µ F C10 0.01 µ F VEE JU5 VCC1IN L5 56nH VCC2IN J9 TP8 JU2 VCC2IN J18 C1 33 µ F C19 0.1 µ F C2 2.2 µ F C3 0.01 µ F C4 0.01 µ F C22 33 µ F JU6 C5 0.1 µ F C12 2.2 µ F C6 0.01 µ F VEE J7 J8 OUT2- 19 ENO2 20 VCC2OUT 21 OUT2- 22 OUT2+ 23 VCC2OUT 24 IN1- MAX3841 OUT1- JU8 VEE 18 VCC1OUT 17 J6 OUT1+ 16 15 J5 VCC1OUT 14 OUT1- 13 VCC GND 12 7 JU1 11 SEL1 VCC1OUT VCC2IN VCC1IN SEL2 6 VCC OUT1+ IN2- 5 U1 10 VCC1IN IN1+ IN2+ 4 J2 IN1- ENO1 VCC1OUT 9 3 VCC1IN VCC2IN IN1+ 2 8 VCC1IN J1 VCC JU9 VEE VCC GND 1 VCC VCC2OUT VCC2OUT VCC JU4 VEE OUT2+ VEE C11 0.01 µ F VEE J10 J14 J12 J16 VCC VEE VCC2IN VCC JU3 VCC2IN J3 IN2+ J4 IN2- VEE Figure 1. MAX3841 EV Kit Schematic Diagram _________________________________________________________________________________________ 3 Evaluates: MAX3841 L6 56nH VEE Evaluates: MAX3841 MAX3841 Evaluation Kit Figure 2. MAX3841 EV Kit Component Placement Guide— Component Side Figure 3. MAX3841 EV Kit PC Board Layout—Component Side 4 _________________________________________________________________________________________ MAX3841 Evaluation Kit Evaluates: MAX3841 Figure 4. MAX3841 EV Kit PC Board Layout—Ground Plane Figure 5. MAX3841 EV Kit PC Board Layout—Power Plane _________________________________________________________________________________________ 5 Evaluates: MAX3841 MAX3841 Evaluation Kit Figure 6. MAX3841 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 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products