19-1732; Rev 0; 5/00 MAX3640 Evaluation Kit The MAX3640 evaluation kit (EV kit) is an assembled surface-mount demonstration board that provides easy evaluation of the MAX3640 622Mbps low-voltage differential signal (LVDS), dual 4:2 asynchronous crosspoint switch. The board includes an extra transmission line for characterization purposes. The MAX3640 EV kit operates from a single +3.3V power supply and includes all external components necessary to interface with the LVDS inputs and outputs. The LVDS inputs (DIA1–DIA4 and DIB1–DIB4) are internally terminated with 100Ω differential input resistance and therefore require no external termination. Ensure that LVDS devices driving these inputs are not redundantly terminated. The LVDS outputs (DOA1–DOA4 and DOB1–DOB4) require a differential termination of 100Ω between the complementary outputs. Connecting LVDS Outputs to 50Ω Oscilloscope Inputs To monitor LVDS signals with 50Ω oscilloscope inputs, leave the coupling capacitors in series with the outputs and remove the differential load resistors (see R1–R8 in the Component List). If you are observing only one output with a 50Ω probe, balance the other output with a 50Ω terminator to ground. Connecting LVDS Outputs to HighImpedance Oscilloscope Inputs To monitor LVDS signals with high-impedance oscilloscope inputs, be sure the 100Ω differential load resistors between the differential outputs are installed (see R1–R8 in the Component List). Layout Consideration All relative input and output data lines have equal lengths to minimize channel-to-channel skew. The transmission lines all have 100Ω differential characteristic impedance between the complementary signal lines. Jumpers Jumpers JU1–JU4 allow the SEL1–SEL4 pins to be attached to VCC or GND. These pins set up the allocation of the input channels to the output channels. Jumpers JU6, JU7, and JU8 allow IN_SEL, ENA, and ENB to be attached to VCC or GND. Refer to Table 1 in the MAX3640 data sheet for more information on these pins. Features ♦ +3.3V Single Supply ♦ Includes Transmission Line for Characterization ♦ Fully Assembled and Tested Surface-Mount Board Ordering Information PART TEMP. RANGE MAX3640EVKIT 0°C to +85°C IC PACKAGE 48 TQFP Component Suppliers SUPPLIER PHONE FAX AVX 803-946-0690 803-626-3123 Digi-Key 218-681-6674 218-681-3380 Murata 814-237-1431 814-238-0490 Note: Please indicate that you are using the MAX3640 when contacting these component suppliers. Component List DESIGNATION QTY DESCRIPTION C1−C20 20 0.01µF ±10%, 16V min X7R type ceramic capacitors C21, C22 2 10µF ±10%, 16V min tantalum capacitors J1–J4, J9–J24 — Not installed J5−J8, J25−J32 12 SMA connectors, PC mount Digi-Key J500-ND J33, J34 2 Test points Digi-Key 5000K-ND JU1−JU4, JU6, JU7, JU8 7 1×3 headers (0.1in centers) Digi-Key S1012-36-ND R1−R8 8 100Ω ±1% resistors (0603) R9−R15 7 1kΩ ±5% resistors (0603) U1 1 MAX3640UCM (48-pin TQFP) None 1 MAX3640 data sheet None 1 MAX3640 EV kit data sheet None 1 MAX3640 PC board (Rev B) ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Evaluates: MAX3640 General Description _______________________________________________________________________________________ J36 SMA J35 SMA 2 2 J34 J8 SMA J7 SMA J6 SMA J5 SMA J4 SMA J3 SMA J2 SMA J1 SMA 1 1 2 2 2 2 2 2 2 2 C21 10µF 1 DIB2N 1 DIB2P 1 DIB1N 1 DIB1P 1 DIA4N 1 DIA4P 1 DIA3N 1 DIA3P + 1 1 2 2 + J9 SMA VCC 1 2 C2 0.01µF C1 0.01µF DIA2N J10 SMA 1 2 VCC 1 J38 SMA J37 SMA C22 10µF 1 J11 SMA 1 2 12 11 10 9 8 7 6 5 4 3 2 1 DIA2P DIA1N VCC VCC GND J12 SMA 1 2 DIB2- DIB2+ DIB1- DIB1+ DIA4- DIA4+ DIA3- DIA3+ GND 1 2 48 13 J33 DIA4P J27 SMA DIA4N 1 2 VCC DIA1P J28 SMA 47 JU6 VCC R12 1k JU1 R9 1k VCC U1 R10 1k VCC JU2 VCC R11 1k JU7 MAX3640 R13 1k DIA2- 46 DIB3+ 14 DIA2+ 15 DIB3- 45 DIA116 DIB4+ 44 DIA1+ DIB4- 2 18 IN_SEL 43 ENA SEL2 VCC VCC R14 1k JU8 DOA1P C17 0.01µF JU3 1 VCC GND VCC VCC GND DOB2- DOB2+ DOB1- DOB1+ DOA4- DOA4+ DOA3- DOA3+ R15 1k JU4 2 1 25 26 27 28 29 30 31 32 33 34 35 36 C4 0.01µF C16 0.01µF C5 0.01µF R1 100Ω 2 1 VCC 2 C7 0.01µF J15 SMA 1 2 R2 100Ω J32 SMA DOA2N R8 100Ω C20 0.01µF 2 C6 0.01µF J14 SMA 1 C3 0.01µF 2 1 J31 SMA DOA2P VCC J13 SMA 1 2 C19 0.01µF J30 SMA DOA1N R7 100Ω C18 0.01µF J29 SMA 37 J26 SMA 19 SEL1 17 42 ENB SEL3 41 VCC SEL4 20 40 39 DOA1+ DOB421 DOA1DOB4+ 38 DOA2+ DOB323 DOA2DOB3+ 24 2 DOB4N J25 SMA DOB4P VCC DIB3P Figure 1. MAX3640 EV Kit Schematic DIB3N DOB3N 2 22 2 DOB3P J16 SMA 1 R3 100Ω R4 100Ω R5 100Ω R6 100Ω DOB2N DOB2P DOB1N DOB1P DOA4N DOA4P DOA3N DOA3P C8 0.01µF C9 0.01µF C10 0.01µF C11 0.01µF C12 0.01µF C13 0.01µF C14 0.01µF C15 0.01µF 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 J17 SMA J18 SMA J19 SMA J20 SMA J21 SMA J22 SMA J23 SMA J24 SMA Evaluates: MAX3640 MAX3640 Evaluation Kit MAX3640 Evaluation Kit Evaluates: MAX3640 Figure 2. MAX3640 EV Kit Component Placement Guide—Top Silkscreen _______________________________________________________________________________________ 3 Evaluates: MAX3640 MAX3640 Evaluation Kit Figure 3. MAX3640 EV Kit PC Board Layout—Component Side 4 _______________________________________________________________________________________ MAX3640 Evaluation Kit Evaluates: MAX3640 Figure 4. MAX3640 EV Kit PC Board Layout—Ground Plane _______________________________________________________________________________________ 5 Evaluates: MAX3640 MAX3640 Evaluation Kit Figure 5. MAX3640 EV Kit PC Board Layout—Power Plane 6 _______________________________________________________________________________________ MAX3640 Evaluation Kit Evaluates: MAX3640 Figure 6. MAX3640 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 7 Evaluates: MAX3640 MAX3640 Evaluation Kit NOTES 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.