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| 19-1732; Rev 0; 5/00 MAX3640 Evaluation Kit General Description 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 100 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 100 between the complementary outputs. o +3.3V Single Supply o Includes Transmission Line for Characterization o Fully Assembled and Tested Surface-Mount Board Features Evaluates: MAX3640 Ordering Information PART MAX3640EVKIT TEMP. RANGE 0C to +85C IC PACKAGE 48 TQFP Component Suppliers SUPPLIER AVX Digi-Key Murata PHONE 803-946-0690 218-681-6674 814-237-1431 FAX 803-626-3123 218-681-3380 814-238-0490 Connecting LVDS Outputs to 50 Oscilloscope Inputs To monitor LVDS signals with 50 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 50 probe, balance the other output with a 50 terminator to ground. Note: Please indicate that you are using the MAX3640 when contacting these component suppliers. Component List DESIGNATION C1-C20 C21, C22 J1-J4, J9-J24 J5-J8, J25-J32 J33, J34 JU1-JU4, JU6, JU7, JU8 R1-R8 R9-R15 U1 None None None QTY 20 2 -- 12 2 7 8 7 1 1 1 1 DESCRIPTION 0.01F 10%, 16V min X7R type ceramic capacitors 10F 10%, 16V min tantalum capacitors Not installed SMA connectors, PC mount Digi-Key J500-ND Test points Digi-Key 5000K-ND 1x3 headers (0.1in centers) Digi-Key S1012-36-ND 100 1% resistors (0603) 1k 5% resistors (0603) MAX3640UCM (48-pin TQFP) MAX3640 data sheet MAX3640 EV kit data sheet MAX3640 PC board (Rev B) Connecting LVDS Outputs to HighImpedance Oscilloscope Inputs To monitor LVDS signals with high-impedance oscilloscope inputs, be sure the 100 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 100 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. ________________________________________________________________ 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 J25 SMA VCC 2 2 1 C20 0.01F R8 100 DOA2P R9 1k DOA3P VCC R6 100 39 40 38 37 DOA3N VCC 36 35 34 33 32 DOB1P 31 30 29 28 DOB2P DOB2GND VCC DIB3DOB4DIB3+ DIB4+ DIB4DOB4+ DOB3SEL1 SEL2 SEL3 SEL4 DOB3+ 27 2 26 25 C3 0.01F VCC R3 100 DOB2N C8 0.01F 1 2 R4 100 DOB1N C10 0.01F C11 0.01F 1 2 1 2 C9 0.01F DOB2+ 1 J18 SMA C16 0.01F DOA4P C13 0.01F 1 2 R5 100 DOA4N C12 0.01F 1 2 DOA1DOA1+ DOA2+ DOA247 46 45 44 43 48 42 41 R10 1k R11 1k DOA2N C15 0.01F 1 2 C14 0.01F 1 2 J22 SMA 1 C17 0.01F DIA1P DIA1N DOA1P DOA1N DIA2P J38 SMA 2 DIA2N R7 100 C18 0.01F C19 0.01F 1 1 1 JU6 2 2 2 JU7 JU8 VCC VCC J32 SMA 2 C21 10F + C22 10F 1 1 1 2 2 J26 SMA J27 SMA J28 SMA J29 SMA J30 SMA J31 SMA ENA DIA2- DIA2+ DIA1- DIA1+ J2 SMA 1 VCC GND GND DOA3+ DOA3DOA4+ DIA3+ DIA3DIA4+ VCC C1 0.01F 2 3 4 5 6 DIA4DIB1+ DIB1DIB2+ DIB2GND VCC DOB1DOA4DOB1+ 7 1 DIA3N 2 J3 SMA 1 DIA4P 2 IN_SEL ENB VCC MAX3640 Evaluation Kit 13 14 15 16 17 18 19 20 21 22 23 DOB4P DOB4N DIB3P DIB3N DIA4P DIA4N R12 1k VCC 2 JU1 R13 1k VCC R14 1k VCC R15 1k VCC C4 0.01F 1 JU2 JU3 JU4 C5 0.01F 2 J13 SMA 1 C6 0.01F 2 J14 SMA 1 DOB3N C7 0.01F 2 J15 SMA 1 J16 SMA 2 1 2 J10 SMA J11 SMA 2 2 J9 SMA J12 SMA 1 1 1 DOB3P _______________________________________________________________________________________ 1 J37 SMA 2 1 J24 SMA VCC J23 SMA J21 SMA 24 Figure 1. MAX3640 EV Kit Schematic 2 U1 MAX3640 J20 SMA 8 9 10 VCC C2 0.01F 12 11 J19 SMA J17 SMA R1 100 R2 100 VCC J33 + J34 J35 SMA 1 2 J36 SMA 1 2 J1 SMA 1 DIA3P 2 J4 SMA 1 DIA4N 2 J5 SMA 1 DIB1P 2 J6 SMA 1 DIB1N 2 J7 SMA 1 DIB2P 2 J8 SMA 1 DIB2N 2 MAX3640 Evaluation Kit Evaluates: MAX3640 Figure 2. MAX3640 EV Kit Component Placement Guide--Top Silkscreen _______________________________________________________________________________________ 3 MAX3640 Evaluation Kit Evaluates: MAX3640 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 MAX3640 Evaluation Kit Evaluates: MAX3640 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 MAX3640 Evaluation Kit Evaluates: MAX3640 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 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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